diff --git a/Spike/Spike.csproj b/Spike/Spike.csproj
new file mode 100644
index 0000000..64e34a8
--- /dev/null
+++ b/Spike/Spike.csproj
@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+</Project>
diff --git a/src/Predictalytics.Api/Endpoints/TraderEndpoints.cs b/src/Predictalytics.Api/Endpoints/TraderEndpoints.cs
index 68d9360..6dbc75c 100644
--- a/src/Predictalytics.Api/Endpoints/TraderEndpoints.cs
+++ b/src/Predictalytics.Api/Endpoints/TraderEndpoints.cs
@@ -9,8 +9,8 @@ public static class TraderEndpoints
     {
         var group = app.MapGroup("/api/traders").WithTags("Traders");
 
-        group.MapGet("/", async (IAnalyticsService svc, int? skip, int? take, string? platform, CancellationToken ct) =>
-            Results.Ok(await svc.GetTradersAsync(skip ?? 0, take ?? 50, platform, ct)));
+        group.MapGet("/", async (IAnalyticsService svc, int? skip, int? take, string? platform, bool? highlyCopyable, CancellationToken ct) =>
+            Results.Ok(await svc.GetTradersAsync(skip ?? 0, take ?? 50, platform, highlyCopyable ?? false, ct)));
 
         group.MapGet("/{id:int}", async (int id, IAnalyticsService svc, CancellationToken ct) =>
         {
diff --git a/src/Predictalytics.Api/wwwroot/css/style.css b/src/Predictalytics.Api/wwwroot/css/style.css
index f0253f9..e4eeb33 100644
--- a/src/Predictalytics.Api/wwwroot/css/style.css
+++ b/src/Predictalytics.Api/wwwroot/css/style.css
@@ -437,6 +437,19 @@ body {
 
 .detail-grid { display: grid; grid-template-columns: 300px 1fr; gap: 24px; align-items: start; }
 .detail-sidebar { padding: 24px; }
+.detail-main { min-width: 0; }
+.trader-menubar { display: flex; justify-content: space-between; align-items: center; background: var(--bg-surface); padding: 16px 24px; border-radius: 8px; border: 1px solid var(--border); margin-bottom: 24px; box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
+.trader-menubar-left { display: flex; align-items: center; gap: 16px; }
+.trader-menubar-right { display: flex; gap: 12px; }
+.menubar-divider { width: 1px; height: 24px; background: var(--border); }
+.btn-outline { background: var(--bg-input); color: var(--text); border: 1px solid var(--border); border-radius: 6px; cursor: pointer; font-weight: 500; transition: all 0.2s; }
+.btn-outline:hover { background: var(--border); }
+.btn-primary { background: var(--primary); color: #000; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; transition: all 0.2s; }
+.btn-primary:hover { filter: brightness(1.1); }
+.tabs-nav { display: flex; gap: 12px; margin-bottom: 24px; border-bottom: 1px solid var(--border); padding-bottom: 8px; flex-wrap: wrap; align-items: center; }
+.btn-tab { white-space: nowrap; padding: 8px 16px; border-radius: 6px; font-size: 14px; transition: background 0.2s; }
+.btn-tab:hover { background: var(--bg-input); }
+.btn-tab.active { background: var(--bg-input); color: var(--primary) !important; border-bottom: 2px solid var(--primary) !important; }
 .stat-group { margin-bottom: 16px; }
 .stat-label { font-size: 11px; font-weight: 700; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.5px; margin-bottom: 4px; }
 .stat-value { font-size: 15px; font-weight: 600; color: var(--text-primary); }
diff --git a/src/Predictalytics.Api/wwwroot/index.html b/src/Predictalytics.Api/wwwroot/index.html
index 5d5417b..75e69d1 100644
--- a/src/Predictalytics.Api/wwwroot/index.html
+++ b/src/Predictalytics.Api/wwwroot/index.html
@@ -127,7 +127,12 @@
             <!-- Traders Page -->
             <section class="page" id="page-traders">
                 <div style="display:flex; justify-content:space-between; align-items:center; margin-bottom:24px;">
-                    <h1 class="page-title" style="margin-bottom:0">Traders</h1>
+                    <div style="display:flex; align-items:center; gap:24px;">
+                        <h1 class="page-title" style="margin-bottom:0">Traders</h1>
+                        <label style="display:flex; align-items:center; gap:8px; font-weight:600; cursor:pointer; background:var(--bg-surface); padding:8px 12px; border-radius:6px; border:1px solid var(--border);">
+                            <input type="checkbox" id="chk-highly-copyable" onchange="loadTraders()"> Highly Copyable
+                        </label>
+                    </div>
                     <div class="card" style="margin-bottom:0; padding:12px 20px; display:flex; gap:12px; align-items:center;">
                         <span style="font-size:13px; font-weight:600">Add Trader:</span>
                         <select id="addPlatform" class="platform-select">
@@ -140,7 +145,7 @@
                 </div>
                 <div class="card">
                     <div class="table-wrap">
-                        <table class="data-table"><thead><tr><th>#</th><th>Name</th><th>Platform</th><th>Score</th><th>Win Rate</th><th>PnL</th><th>Tier</th><th>Strategy</th><th>Actions</th></tr></thead>
+                        <table class="data-table"><thead><tr><th>#</th><th>Name</th><th>Platform</th><th>Combined Score</th><th>Quality</th><th>Copyability</th><th>Win Rate</th><th>PnL</th><th>Tier</th><th>Strategy</th><th>Actions</th></tr></thead>
                             <tbody id="allTradersBody"></tbody>
                         </table>
                     </div>
@@ -181,20 +186,20 @@
             <!-- Trader Detail Page -->
             <section class="page" id="page-trader-detail">
                 <!-- Trader Detail Menu Bar -->
-                <div class="detail-header" style="justify-content:space-between; background:var(--bg-surface); padding:16px; border-radius:8px; border:1px solid var(--border); margin-bottom:24px; box-shadow:0 4px 12px rgba(0,0,0,0.1);">
-                    <div style="display:flex; align-items:center; gap:16px">
-                        <button class="btn-back" onclick="navigateBack()" style="background:transparent; border:none; color:var(--text-muted); cursor:pointer; font-weight:bold; font-size:16px;">← Back</button>
-                        <div style="width:1px; height:24px; background:var(--border);"></div>
-                        <h1 class="page-title" id="td-name" style="margin-bottom:0; font-size:24px;">Trader Name</h1>
+                <div class="trader-menubar">
+                    <div class="trader-menubar-left">
+                        <button class="btn-back" onclick="navigateBack()">← Back</button>
+                        <div class="menubar-divider"></div>
+                        <h1 class="page-title" id="td-name" style="margin-bottom:0;">Trader Name</h1>
                     </div>
-                    <div style="display:flex; gap:12px;">
-                        <button class="btn-sm" id="btn-toggle-watchlist" style="padding:8px 16px; background:var(--bg-input); color:var(--text); border:1px solid var(--border); border-radius:6px; cursor:pointer; font-weight:500; transition:all 0.2s;">
+                    <div class="trader-menubar-right">
+                        <button class="btn-sm btn-outline" id="btn-toggle-watchlist">
                             ☆ Watchlist
                         </button>
-                        <button class="btn-sm" id="btn-open-platform" style="padding:8px 16px; background:var(--bg-input); color:var(--text); border:1px solid var(--border); border-radius:6px; cursor:pointer; font-weight:500; transition:all 0.2s; display:none;">
+                        <button class="btn-sm btn-outline" id="btn-open-platform" style="display:none;">
                             🌐 Open Platform
                         </button>
-                        <button class="btn-sm" id="btn-refresh-trader" style="padding:8px 16px; background:var(--primary); color:#000; border:none; border-radius:6px; cursor:pointer; font-weight:bold; transition:all 0.2s;">
+                        <button class="btn-sm btn-primary" id="btn-refresh-trader">
                             ⟱ Sync History
                         </button>
                     </div>
@@ -222,10 +227,10 @@
                     </div>
                     <div class="detail-main">
                         <!-- Tabs Navigation -->
-                        <div class="tabs-nav" style="display:flex; gap:16px; margin-bottom:16px; border-bottom:1px solid var(--border); padding-bottom:8px;">
-                            <button class="btn-tab active" data-tab="td-tab-analytics" onclick="switchTraderTab('td-tab-analytics')" style="background:transparent; border:none; color:var(--text); font-weight:bold; cursor:pointer;">Analytics & AI</button>
-                            <button class="btn-tab" data-tab="td-tab-recent" onclick="switchTraderTab('td-tab-recent')" style="background:transparent; border:none; color:var(--text-muted); cursor:pointer;">Recent Trades</button>
-                            <button class="btn-tab" data-tab="td-tab-positions" onclick="switchTraderTab('td-tab-positions')" style="background:transparent; border:none; color:var(--text-muted); cursor:pointer;">Positions</button>
+                        <div class="tabs-nav">
+                            <button class="btn-tab active" data-tab="td-tab-analytics" onclick="switchTraderTab('td-tab-analytics')">Analytics & AI</button>
+                            <button class="btn-tab" data-tab="td-tab-recent" onclick="switchTraderTab('td-tab-recent')">Recent Trades</button>
+                            <button class="btn-tab" data-tab="td-tab-positions" onclick="switchTraderTab('td-tab-positions')">Positions</button>
                         </div>
 
                         <!-- Tab Content: Analytics -->
@@ -234,10 +239,12 @@
                                 <div class="metric-card"><div class="metric-label">Win Rate</div><div class="metric-value" id="td-winrate">---</div></div>
                                 <div class="metric-card"><div class="metric-label">Total PnL</div><div class="metric-value" id="td-pnl">---</div></div>
                                 <div class="metric-card"><div class="metric-label">Total Trades</div><div class="metric-value" id="td-trades">---</div></div>
+                                <div class="metric-card"><div class="metric-label">Quality Edge</div><div class="metric-value" id="td-quality-score">---</div></div>
+                                <div class="metric-card"><div class="metric-label">Copyability</div><div class="metric-value" id="td-copyability-score">---</div></div>
                                 <div class="metric-card accent">
-                                    <div class="metric-label">Score</div>
+                                    <div class="metric-label">Combined Score</div>
                                     <div class="metric-value" id="td-score">---</div>
-                                    <button class="btn-sm" id="btn-force-analyze" style="margin-top:8px; padding:4px 8px; width:100%; background:var(--bg-input);">Recalculate</button>
+                                    <button class="btn-sm btn-outline" id="btn-force-analyze" style="margin-top:8px; padding:4px 8px; width:100%; border-color:rgba(255,255,255,0.2);">Recalculate</button>
                                 </div>
                             </div>
                             
diff --git a/src/Predictalytics.Api/wwwroot/js/app.js b/src/Predictalytics.Api/wwwroot/js/app.js
index 1b84e39..5583ecf 100644
--- a/src/Predictalytics.Api/wwwroot/js/app.js
+++ b/src/Predictalytics.Api/wwwroot/js/app.js
@@ -275,9 +275,15 @@ async function loadDashboard() {
 async function loadTraders() {
     let url = '/api/traders?skip=0&take=100';
     if (currentPlatform !== 'All') url += `&platform=${currentPlatform}`;
+    
+    const hcCheckbox = document.getElementById('chk-highly-copyable');
+    if (hcCheckbox && hcCheckbox.checked) {
+        url += `&highlyCopyable=true`;
+    }
+
     let data = await api(url);
     const tbody = document.getElementById('allTradersBody');
-    if (!data || !data.length) { tbody.innerHTML = '<tr><td colspan="9"><div class="empty-state"><p>No traders tracked yet.</p></div></td></tr>'; return; }
+    if (!data || !data.length) { tbody.innerHTML = '<tr><td colspan="11"><div class="empty-state"><p>No traders tracked yet.</p></div></td></tr>'; return; }
 
     // Sorting
     if (currentSort === 'score') data.sort((a, b) => b.combinedScore - a.combinedScore);
@@ -287,9 +293,11 @@ async function loadTraders() {
     tbody.innerHTML = data.map((t, i) => `
         <tr>
             <td>${i + 1}</td>
-            <td><strong><a href="#" onclick="viewTrader(${t.id}); return false;" style="color:var(--primary);text-decoration:none;">${t.displayName}</a></strong></td>
+            <td><strong><a href="#" onclick="viewTrader(${t.id}); return false;" style="color:var(--primary);text-decoration:none;">${t.displayName}</a></strong>${t.isSuspectedBot ? ' 🤖' : ''}</td>
             <td>${t.platform}</td>
             <td><strong>${Number(t.combinedScore).toFixed(1)}</strong></td>
+            <td>${Number(t.copytradingQualityScore || 0).toFixed(1)}</td>
+            <td>${Number(t.copytradingCopyabilityScore || 0).toFixed(1)}</td>
             <td>${fmt.pct(t.winRate)}</td>
             <td>${fmt.pnl(t.totalPnl)}</td>
             <td>${fmt.tier(t.tier)}</td>
@@ -358,6 +366,8 @@ async function viewTrader(id) {
     document.getElementById('td-pnl').innerHTML = fmt.pnl(t.totalPnl);
     document.getElementById('td-trades').textContent = fmt.num(t.totalTrades);
     document.getElementById('td-score').textContent = Number(t.combinedScore).toFixed(1);
+    document.getElementById('td-quality-score').textContent = Number(t.copytradingQualityScore || 0).toFixed(1);
+    document.getElementById('td-copyability-score').textContent = Number(t.copytradingCopyabilityScore || 0).toFixed(1);
     document.getElementById('td-ai-summary').textContent = t.aiStrategySummary || 'Not analyzed yet.';
     
     const refreshBtn = document.getElementById('btn-refresh-trader');
diff --git a/src/Predictalytics.Application/DTOs/TraderDto.cs b/src/Predictalytics.Application/DTOs/TraderDto.cs
index 05bd9de..9e2a044 100644
--- a/src/Predictalytics.Application/DTOs/TraderDto.cs
+++ b/src/Predictalytics.Application/DTOs/TraderDto.cs
@@ -11,6 +11,8 @@ public record TraderDto(
     string Strategy,
     decimal CombinedScore,
     decimal CopytradingScore,
+    decimal CopytradingQualityScore,
+    decimal CopytradingCopyabilityScore,
     decimal WinRate,
     decimal TotalPnl,
     int TotalTrades,
@@ -38,6 +40,8 @@ public record TraderDetailDto(
     decimal TimingScore,
     decimal CombinedScore,
     decimal CopytradingScore,
+    decimal CopytradingQualityScore,
+    decimal CopytradingCopyabilityScore,
     int Rank,
     bool IsOnWatchlist,
     DateTime CreatedAt,
diff --git a/src/Predictalytics.Application/Interfaces/IAnalyticsService.cs b/src/Predictalytics.Application/Interfaces/IAnalyticsService.cs
index 975456e..284ab3b 100644
--- a/src/Predictalytics.Application/Interfaces/IAnalyticsService.cs
+++ b/src/Predictalytics.Application/Interfaces/IAnalyticsService.cs
@@ -12,7 +12,7 @@ public interface IAnalyticsService
     Task<TraderDeepDiveDto?> GetTraderDeepDiveAsync(int traderId, CancellationToken ct = default);
 
     /// <summary>Get trader list with scores.</summary>
-    Task<IReadOnlyList<TraderDto>> GetTradersAsync(int skip = 0, int take = 50, string? platform = null, CancellationToken ct = default);
+    Task<IReadOnlyList<TraderDto>> GetTradersAsync(int skip = 0, int take = 50, string? platform = null, bool highlyCopyable = false, CancellationToken ct = default);
 
     /// <summary>Get a trader's details.</summary>
     Task<TraderDetailDto?> GetTraderDetailAsync(int traderId, CancellationToken ct = default);
diff --git a/src/Predictalytics.Application/Interfaces/ICopytradingBacktestHarness.cs b/src/Predictalytics.Application/Interfaces/ICopytradingBacktestHarness.cs
new file mode 100644
index 0000000..b9ad007
--- /dev/null
+++ b/src/Predictalytics.Application/Interfaces/ICopytradingBacktestHarness.cs
@@ -0,0 +1,23 @@
+using Predictalytics.Domain.Entities;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Predictalytics.Application.Interfaces;
+
+public class BacktestResult
+{
+    public int LatencySeconds { get; set; }
+    public decimal HypotheticalFollowerPnl { get; set; }
+    public decimal TraderPnl { get; set; }
+    public decimal AlphaDecayPercentage { get; set; }
+}
+
+public interface ICopytradingBacktestHarness
+{
+    /// <summary>
+    /// Runs a latency sweep (0s, 10s, 30s, 60s) for a given trader over their historical trades
+    /// to determine exactly how much alpha is lost to the tape execution.
+    /// </summary>
+    Task<List<BacktestResult>> RunLatencySweepAsync(Trader trader, IReadOnlyList<Trade> trades, CancellationToken ct = default);
+}
diff --git a/src/Predictalytics.Application/Interfaces/ICopytradingEstimator.cs b/src/Predictalytics.Application/Interfaces/ICopytradingEstimator.cs
new file mode 100644
index 0000000..de9eee4
--- /dev/null
+++ b/src/Predictalytics.Application/Interfaces/ICopytradingEstimator.cs
@@ -0,0 +1,48 @@
+using Predictalytics.Domain.Entities;
+using System.Collections.Generic;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Predictalytics.Application.Interfaces;
+
+public interface ICopytradingEstimator
+{
+    /// <summary>
+    /// Calculates the dual-axis copytrading score (Quality & Copyability).
+    /// </summary>
+    Task<(decimal QualityScore, decimal CopyabilityScore, decimal CombinedScore)> CalculateScoresAsync(
+        Trader trader, 
+        IReadOnlyList<Trade> trades, 
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Replays the trades using the historical trade tape to estimate the true alpha decay and Follower Fill Price.
+    /// Returns the VWAP of the follower fill, capped by the actual volume in the latency window.
+    /// </summary>
+    Task<decimal?> EstimateFollowerFillPriceAsync(
+        Trade traderTrade, 
+        int latencySeconds = 10, 
+        CancellationToken ct = default);
+
+    /// <summary>
+    /// Clusters trades into logical events (positions) based on a time window (e.g., 24h) and market.
+    /// </summary>
+    IReadOnlyList<TradeEvent> ClusterTradesIntoEvents(IReadOnlyList<Trade> trades, TimeSpan window);
+
+    /// <summary>
+    /// Calculates Maximum Adverse Excursion (MAE) during the holding period, handling tape sparsity.
+    /// </summary>
+    Task<decimal?> CalculateMaeAsync(TradeEvent tradeEvent, CancellationToken ct = default);
+}
+
+public class TradeEvent
+{
+    public string MarketId { get; set; } = "";
+    public string AssetId { get; set; } = "";
+    public Predictalytics.Domain.Enums.TradeSide Side { get; set; }
+    public decimal AveragePrice { get; set; }
+    public decimal TotalSize { get; set; }
+    public DateTimeOffset EventStartTime { get; set; }
+    public DateTimeOffset EventEndTime { get; set; }
+    public List<Trade> ConstituentTrades { get; set; } = new();
+}
diff --git a/src/Predictalytics.Application/Services/AnalyticsService.cs b/src/Predictalytics.Application/Services/AnalyticsService.cs
index 1fc7f00..de96137 100644
--- a/src/Predictalytics.Application/Services/AnalyticsService.cs
+++ b/src/Predictalytics.Application/Services/AnalyticsService.cs
@@ -145,13 +145,21 @@ public class AnalyticsService : IAnalyticsService
             analysis.BotIndicators, analysis.Summary, tradeDtos);
     }
 
-    public async Task<IReadOnlyList<TraderDto>> GetTradersAsync(int skip = 0, int take = 50, string? platform = null, CancellationToken ct = default)
+    public async Task<IReadOnlyList<TraderDto>> GetTradersAsync(int skip = 0, int take = 50, string? platform = null, bool highlyCopyable = false, CancellationToken ct = default)
     {
         PlatformType? pType = null;
         if (!string.IsNullOrEmpty(platform) && platform != "All" && Enum.TryParse<PlatformType>(platform, true, out var pt))
             pType = pt;
 
-        var traders = await _traderRepo.GetAllAsync(platform: pType, skip: skip, take: take, ct: ct);
+        var traders = await _traderRepo.GetAllAsync(platform: pType, skip: 0, take: 5000, ct: ct); // Get more to filter in memory
+        
+        if (highlyCopyable)
+        {
+            traders = traders.Where(t => t.CurrentScore != null && t.CurrentScore.CopytradingScore >= 60).ToList();
+        }
+
+        traders = traders.Skip(skip).Take(take).ToList();
+
         var watchlist = await _watchlistRepo.GetAllAsync(ct);
         var wIds = watchlist.Select(w => w.TraderId).ToHashSet();
         return traders.Select(t => MapTraderDto(t, wIds)).ToList();
@@ -205,7 +213,7 @@ public class AnalyticsService : IAnalyticsService
             trader.Notes, trader.Tier.ToString(), trader.Strategy.ToString(), trader.IsSuspectedBot, trader.ManualPriorityOverride,
             trader.WinRate, trader.TotalPnl, trader.TotalTrades,
             s?.ActivityScore ?? 0, s?.QualityScore ?? 0, s?.VolumeScore ?? 0, s?.TimingScore ?? 0,
-            s?.CombinedScore ?? 0, s?.CopytradingScore ?? 0, s?.Rank ?? 0, wl != null, trader.CreatedAt, trader.LastPolledAt,
+            s?.CombinedScore ?? 0, s?.CopytradingScore ?? 0, s?.CopytradingQualityScore ?? 0, s?.CopytradingCopyabilityScore ?? 0, s?.Rank ?? 0, wl != null, trader.CreatedAt, trader.LastPolledAt,
             trader.AiStrategySummary,
             trades.Select(MapTradeDto).ToList(),
             perfs);
@@ -443,7 +451,9 @@ public class AnalyticsService : IAnalyticsService
 
     private static TraderDto MapTraderDto(Trader t, HashSet<int> wIds) => new(
         t.Id, t.Platform.ToString(), t.PlatformUserId, t.DisplayName, t.Tier.ToString(), t.Strategy.ToString(),
-        t.CurrentScore?.CombinedScore ?? 0, t.CurrentScore?.CopytradingScore ?? 0, t.WinRate, t.TotalPnl, t.TotalTrades,
+        t.CurrentScore?.CombinedScore ?? 0, t.CurrentScore?.CopytradingScore ?? 0, 
+        t.CurrentScore?.CopytradingQualityScore ?? 0, t.CurrentScore?.CopytradingCopyabilityScore ?? 0,
+        t.WinRate, t.TotalPnl, t.TotalTrades,
         wIds.Contains(t.Id), t.IsSuspectedBot, t.LastPolledAt);
 
     private static TradeDto MapTradeDto(Trade t) => new(
diff --git a/src/Predictalytics.Domain/Entities/TradeContext.cs b/src/Predictalytics.Domain/Entities/TradeContext.cs
index bc99f15..9632119 100644
--- a/src/Predictalytics.Domain/Entities/TradeContext.cs
+++ b/src/Predictalytics.Domain/Entities/TradeContext.cs
@@ -21,6 +21,12 @@ public class TradeContext
     /// <summary>The estimated mid-price of the asset roughly 1 minute after the trade execution.</summary>
     public decimal? PriceAfter1m { get; set; }
 
+    /// <summary>The volume-weighted exact follower fill price 10 seconds after the trade execution (excluding the trader's own trades).</summary>
+    public decimal? FollowerFillPrice10s { get; set; }
+
+    /// <summary>The volume-weighted exact follower fill price 60 seconds after the trade execution (excluding the trader's own trades).</summary>
+    public decimal? FollowerFillPrice60s { get; set; }
+
     /// <summary>Calculated slippage: execution price vs PriceBefore1m.</summary>
     public decimal? EstimatedSlippage { get; set; }
 
diff --git a/src/Predictalytics.Domain/Entities/TraderScore.cs b/src/Predictalytics.Domain/Entities/TraderScore.cs
index 2510599..de904aa 100644
--- a/src/Predictalytics.Domain/Entities/TraderScore.cs
+++ b/src/Predictalytics.Domain/Entities/TraderScore.cs
@@ -32,6 +32,12 @@ public class TraderScore
     /// <summary>Copytrading suitability score (0-100).</summary>
     public decimal CopytradingScore { get; set; }
 
+    /// <summary>The pure skill/edge dimension of the copytrading score (0-100).</summary>
+    public decimal CopytradingQualityScore { get; set; }
+
+    /// <summary>The copyability dimension (alpha-decay, sizing consistency) of the copytrading score (0-100).</summary>
+    public decimal CopytradingCopyabilityScore { get; set; }
+
     /// <summary>When this score was last calculated.</summary>
     public DateTime CalculatedAt { get; set; } = DateTime.UtcNow;
 
diff --git a/src/Predictalytics.Infrastructure/DependencyInjection.cs b/src/Predictalytics.Infrastructure/DependencyInjection.cs
index b84a5d6..b66c9dc 100644
--- a/src/Predictalytics.Infrastructure/DependencyInjection.cs
+++ b/src/Predictalytics.Infrastructure/DependencyInjection.cs
@@ -73,6 +73,8 @@ public static class DependencyInjection
         services.AddScoped<IDiscoveryService, DiscoveryService>();
         services.AddScoped<IAlertService, AlertService>();
         services.AddScoped<IAnalyticsService, AnalyticsService>();
+        services.AddScoped<ICopytradingEstimator, CopytradingEstimator>();
+        services.AddScoped<ICopytradingBacktestHarness, CopytradingBacktestHarness>();
         services.AddScoped<WatchlistService>();
         services.AddSingleton<IRateLimiter, RateLimiterService>();
         services.AddSingleton<IPlatformStatisticsService, PlatformStatisticsService>();
diff --git a/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.Designer.cs b/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.Designer.cs
new file mode 100644
index 0000000..ee68f8c
--- /dev/null
+++ b/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.Designer.cs
@@ -0,0 +1,978 @@
+// <auto-generated />
+using System;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Infrastructure;
+using Microsoft.EntityFrameworkCore.Metadata;
+using Microsoft.EntityFrameworkCore.Migrations;
+using Microsoft.EntityFrameworkCore.Storage.ValueConversion;
+using Predictalytics.Infrastructure.Data;
+
+#nullable disable
+
+namespace Predictalytics.Infrastructure.Migrations
+{
+    [DbContext(typeof(AppDbContext))]
+    [Migration("20260706081202_AddCopytradingScoreAndTapeFills")]
+    partial class AddCopytradingScoreAndTapeFills
+    {
+        /// <inheritdoc />
+        protected override void BuildTargetModel(ModelBuilder modelBuilder)
+        {
+#pragma warning disable 612, 618
+            modelBuilder
+                .HasAnnotation("ProductVersion", "8.0.11")
+                .HasAnnotation("Relational:MaxIdentifierLength", 64);
+
+            MySqlModelBuilderExtensions.AutoIncrementColumns(modelBuilder);
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Alert", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<bool>("IsRead")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<string>("Message")
+                        .IsRequired()
+                        .HasMaxLength(4096)
+                        .HasColumnType("varchar(4096)");
+
+                    b.Property<int>("Platform")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Severity")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("varchar(512)");
+
+                    b.Property<int?>("TraderId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Type")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("CreatedAt");
+
+                    b.HasIndex("TraderId");
+
+                    b.ToTable("Alerts");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Event", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("DbCreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4096)
+                        .HasColumnType("varchar(4096)");
+
+                    b.Property<DateTime?>("EndDate")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("ImageUrl")
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<bool>("IsClosed")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<DateTime?>("LastUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("Platform")
+                        .HasColumnType("int");
+
+                    b.Property<long>("PlatformEventId")
+                        .HasColumnType("bigint");
+
+                    b.Property<string>("Slug")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("varchar(512)");
+
+                    b.Property<DateTime?>("StartDate")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("Tags")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.Property<string>("Title")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Platform", "PlatformEventId")
+                        .IsUnique();
+
+                    b.ToTable("Events");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Market", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("varchar(64)");
+
+                    b.Property<string>("ConditionId")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("DbCreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("Description")
+                        .HasMaxLength(4096)
+                        .HasColumnType("varchar(4096)");
+
+                    b.Property<DateTime?>("EndDate")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("EventId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("ImageUrl")
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.Property<bool>("IsResolved")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<DateTime?>("LastTradesUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime?>("LastUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<decimal>("Liquidity")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<string>("MarketSlug")
+                        .IsRequired()
+                        .HasMaxLength(512)
+                        .HasColumnType("varchar(512)");
+
+                    b.Property<int>("Platform")
+                        .HasColumnType("int");
+
+                    b.Property<long>("PlatformMarketId")
+                        .HasColumnType("bigint");
+
+                    b.Property<string>("Question")
+                        .IsRequired()
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.Property<string>("QuestionId")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<string>("ResolutionOutcome")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime?>("StartDate")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("Subcategory")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("varchar(128)");
+
+                    b.Property<decimal>("Volume")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("Volume24h")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EventId");
+
+                    b.HasIndex("Platform", "PlatformMarketId")
+                        .IsUnique();
+
+                    b.ToTable("Markets");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketAnalytics", b =>
+                {
+                    b.Property<int>("MarketId")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("AverageTradeSize")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("BotActivityScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<DateTime>("LastCalculatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("UniqueTradersCount")
+                        .HasColumnType("int");
+
+                    b.HasKey("MarketId");
+
+                    b.ToTable("MarketAnalytics");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketOutcome", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<decimal>("CurrentPrice")
+                        .HasPrecision(18, 8)
+                        .HasColumnType("decimal(18,8)");
+
+                    b.Property<string>("Label")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<int>("MarketId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("OutcomeIndex")
+                        .HasColumnType("int");
+
+                    b.Property<string>("TokenId")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TokenId");
+
+                    b.HasIndex("MarketId", "OutcomeIndex")
+                        .IsUnique();
+
+                    b.ToTable("MarketOutcomes");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketOutcomePriceSnapshot", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<int>("MarketOutcomeId")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("Price")
+                        .HasPrecision(10, 6)
+                        .HasColumnType("decimal(10,6)");
+
+                    b.Property<DateTime>("Timestamp")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MarketOutcomeId", "Timestamp");
+
+                    b.ToTable("MarketOutcomePriceSnapshots");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.PlatformConfig", b =>
+                {
+                    b.Property<int>("Id")
+                        .HasColumnType("int");
+
+                    b.Property<string>("BaseUrl")
+                        .HasMaxLength(1024)
+                        .HasColumnType("varchar(1024)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("DisplayName")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<bool>("IsActive")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<string>("Name")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("varchar(128)");
+
+                    b.Property<string>("SettingsJson")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime>("UpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.HasKey("Id");
+
+                    b.ToTable("PlatformConfigs");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Trade", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<long>("Id"));
+
+                    b.Property<decimal>("Amount")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<string>("AssetId")
+                        .IsRequired()
+                        .HasMaxLength(80)
+                        .HasColumnType("varchar(80)");
+
+                    b.Property<int?>("DbMarketId")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime>("ExecutedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<bool>("IsContextEnriched")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<string>("MarketId")
+                        .IsRequired()
+                        .HasMaxLength(66)
+                        .HasColumnType("varchar(66)");
+
+                    b.Property<int?>("MarketOutcomeId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Outcome")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("varchar(128)");
+
+                    b.Property<int>("Platform")
+                        .HasColumnType("int");
+
+                    b.Property<string>("PlatformTradeId")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<decimal?>("PostTradePrice1m")
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal?>("PreTradePrice1m")
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("Price")
+                        .HasPrecision(18, 6)
+                        .HasColumnType("decimal(18,6)");
+
+                    b.Property<int>("Side")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("Size")
+                        .HasPrecision(14, 6)
+                        .HasColumnType("decimal(14,6)");
+
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.Property<string>("TransactionHash")
+                        .HasMaxLength(66)
+                        .HasColumnType("varchar(66)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("AssetId");
+
+                    b.HasIndex("DbMarketId");
+
+                    b.HasIndex("ExecutedAt");
+
+                    b.HasIndex("MarketOutcomeId");
+
+                    b.HasIndex("TraderId");
+
+                    b.HasIndex("Platform", "PlatformTradeId")
+                        .IsUnique();
+
+                    b.ToTable("Trades");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TradeContext", b =>
+                {
+                    b.Property<long>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("bigint");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<long>("Id"));
+
+                    b.Property<string>("EstimatedOrderType")
+                        .IsRequired()
+                        .HasMaxLength(32)
+                        .HasColumnType("varchar(32)");
+
+                    b.Property<decimal?>("EstimatedSlippage")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal?>("FollowerFillPrice10s")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal?>("FollowerFillPrice60s")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal?>("PriceAfter1m")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal?>("PriceBefore1m")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<long>("TradeId")
+                        .HasColumnType("bigint");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TradeId")
+                        .IsUnique();
+
+                    b.ToTable("TradeContexts");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Trader", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("AiStrategySummary")
+                        .HasColumnType("longtext");
+
+                    b.Property<DateTime?>("AiStrategyUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime>("CreatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<string>("DisplayName")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<bool>("IsAutoDiscovered")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<bool>("IsInitialImportComplete")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<bool>("IsSuspectedBot")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<DateTime?>("LastAnalyzedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime?>("LastApiErrorAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime?>("LastPolledAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<DateTime?>("LastTradesUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int?>("ManualPriorityOverride")
+                        .HasColumnType("int");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("longtext");
+
+                    b.Property<int>("Platform")
+                        .HasColumnType("int");
+
+                    b.Property<string>("PlatformUserId")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("varchar(128)");
+
+                    b.Property<int>("Strategy")
+                        .HasColumnType("int");
+
+                    b.Property<int>("Tier")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("TotalPnl")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<int>("TotalTrades")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("WinRate")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("Platform", "PlatformUserId")
+                        .IsUnique();
+
+                    b.ToTable("Traders");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderAnalytics", b =>
+                {
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.Property<DateTime>("LastCalculatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<decimal>("OverallPnL")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("OverallWinRate")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<decimal>("PnL24h")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("PnL30d")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("PnL7d")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("WinRate24h")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<decimal>("WinRate30d")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<decimal>("WinRate7d")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.HasKey("TraderId");
+
+                    b.ToTable("TraderAnalytics");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderCategoryPerformance", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<string>("Category")
+                        .IsRequired()
+                        .HasMaxLength(64)
+                        .HasColumnType("varchar(64)");
+
+                    b.Property<string>("Subcategory")
+                        .IsRequired()
+                        .HasMaxLength(128)
+                        .HasColumnType("varchar(128)");
+
+                    b.Property<decimal>("TotalPnL")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<int>("TotalTrades")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("TotalVolume")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.Property<int>("WinningTrades")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TraderId", "Category", "Subcategory")
+                        .IsUnique();
+
+                    b.ToTable("TraderCategoryPerformances");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderPosition", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<decimal>("AvgCost")
+                        .HasPrecision(10, 6)
+                        .HasColumnType("decimal(10,6)");
+
+                    b.Property<DateTime>("LastUpdatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<int>("MarketOutcomeId")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("RealizedPnl")
+                        .HasPrecision(18, 4)
+                        .HasColumnType("decimal(18,4)");
+
+                    b.Property<decimal>("SharesHeld")
+                        .HasPrecision(14, 6)
+                        .HasColumnType("decimal(14,6)");
+
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("MarketOutcomeId");
+
+                    b.HasIndex("TraderId", "MarketOutcomeId")
+                        .IsUnique();
+
+                    b.ToTable("TraderPositions");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderScore", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<decimal>("ActivityScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<DateTime>("CalculatedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<decimal>("CombinedScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<decimal>("CopytradingCopyabilityScore")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal>("CopytradingQualityScore")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal>("CopytradingScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<decimal>("QualityScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<int>("Rank")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("TimingScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.Property<decimal>("VolumeScore")
+                        .HasPrecision(8, 4)
+                        .HasColumnType("decimal(8,4)");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TraderId")
+                        .IsUnique();
+
+                    b.ToTable("TraderScores");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.WatchlistEntry", b =>
+                {
+                    b.Property<int>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("int");
+
+                    MySqlPropertyBuilderExtensions.UseMySqlIdentityColumn(b.Property<int>("Id"));
+
+                    b.Property<DateTime>("AddedAt")
+                        .HasColumnType("datetime(6)");
+
+                    b.Property<bool>("AlertsEnabled")
+                        .HasColumnType("tinyint(1)");
+
+                    b.Property<string>("Label")
+                        .IsRequired()
+                        .HasMaxLength(256)
+                        .HasColumnType("varchar(256)");
+
+                    b.Property<string>("Notes")
+                        .HasColumnType("longtext");
+
+                    b.Property<int>("TraderId")
+                        .HasColumnType("int");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("TraderId")
+                        .IsUnique();
+
+                    b.ToTable("WatchlistEntries");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Alert", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithMany()
+                        .HasForeignKey("TraderId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Market", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Event", "Event")
+                        .WithMany("Markets")
+                        .HasForeignKey("EventId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Event");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketAnalytics", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Market", "Market")
+                        .WithOne("Analytics")
+                        .HasForeignKey("Predictalytics.Domain.Entities.MarketAnalytics", "MarketId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Market");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketOutcome", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Market", "Market")
+                        .WithMany("Outcomes")
+                        .HasForeignKey("MarketId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Market");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.MarketOutcomePriceSnapshot", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.MarketOutcome", "MarketOutcome")
+                        .WithMany()
+                        .HasForeignKey("MarketOutcomeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("MarketOutcome");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Trade", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Market", "DbMarket")
+                        .WithMany()
+                        .HasForeignKey("DbMarketId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Predictalytics.Domain.Entities.MarketOutcome", "MarketOutcome")
+                        .WithMany()
+                        .HasForeignKey("MarketOutcomeId")
+                        .OnDelete(DeleteBehavior.SetNull);
+
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithMany("Trades")
+                        .HasForeignKey("TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("DbMarket");
+
+                    b.Navigation("MarketOutcome");
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TradeContext", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trade", "Trade")
+                        .WithOne("Context")
+                        .HasForeignKey("Predictalytics.Domain.Entities.TradeContext", "TradeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Trade");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderAnalytics", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithOne("Analytics")
+                        .HasForeignKey("Predictalytics.Domain.Entities.TraderAnalytics", "TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderCategoryPerformance", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithMany("CategoryPerformances")
+                        .HasForeignKey("TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderPosition", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.MarketOutcome", "MarketOutcome")
+                        .WithMany()
+                        .HasForeignKey("MarketOutcomeId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithMany("Positions")
+                        .HasForeignKey("TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("MarketOutcome");
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.TraderScore", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithOne("CurrentScore")
+                        .HasForeignKey("Predictalytics.Domain.Entities.TraderScore", "TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.WatchlistEntry", b =>
+                {
+                    b.HasOne("Predictalytics.Domain.Entities.Trader", "Trader")
+                        .WithMany("WatchlistEntries")
+                        .HasForeignKey("TraderId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Trader");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Event", b =>
+                {
+                    b.Navigation("Markets");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Market", b =>
+                {
+                    b.Navigation("Analytics");
+
+                    b.Navigation("Outcomes");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Trade", b =>
+                {
+                    b.Navigation("Context");
+                });
+
+            modelBuilder.Entity("Predictalytics.Domain.Entities.Trader", b =>
+                {
+                    b.Navigation("Analytics");
+
+                    b.Navigation("CategoryPerformances");
+
+                    b.Navigation("CurrentScore");
+
+                    b.Navigation("Positions");
+
+                    b.Navigation("Trades");
+
+                    b.Navigation("WatchlistEntries");
+                });
+#pragma warning restore 612, 618
+        }
+    }
+}
diff --git a/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.cs b/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.cs
new file mode 100644
index 0000000..7de5963
--- /dev/null
+++ b/src/Predictalytics.Infrastructure/Migrations/20260706081202_AddCopytradingScoreAndTapeFills.cs
@@ -0,0 +1,60 @@
+using Microsoft.EntityFrameworkCore.Migrations;
+
+#nullable disable
+
+namespace Predictalytics.Infrastructure.Migrations
+{
+    /// <inheritdoc />
+    public partial class AddCopytradingScoreAndTapeFills : Migration
+    {
+        /// <inheritdoc />
+        protected override void Up(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.AddColumn<decimal>(
+                name: "CopytradingCopyabilityScore",
+                table: "TraderScores",
+                type: "decimal(65,30)",
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "CopytradingQualityScore",
+                table: "TraderScores",
+                type: "decimal(65,30)",
+                nullable: false,
+                defaultValue: 0m);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "FollowerFillPrice10s",
+                table: "TradeContexts",
+                type: "decimal(65,30)",
+                nullable: true);
+
+            migrationBuilder.AddColumn<decimal>(
+                name: "FollowerFillPrice60s",
+                table: "TradeContexts",
+                type: "decimal(65,30)",
+                nullable: true);
+        }
+
+        /// <inheritdoc />
+        protected override void Down(MigrationBuilder migrationBuilder)
+        {
+            migrationBuilder.DropColumn(
+                name: "CopytradingCopyabilityScore",
+                table: "TraderScores");
+
+            migrationBuilder.DropColumn(
+                name: "CopytradingQualityScore",
+                table: "TraderScores");
+
+            migrationBuilder.DropColumn(
+                name: "FollowerFillPrice10s",
+                table: "TradeContexts");
+
+            migrationBuilder.DropColumn(
+                name: "FollowerFillPrice60s",
+                table: "TradeContexts");
+        }
+    }
+}
diff --git a/src/Predictalytics.Infrastructure/Migrations/AppDbContextModelSnapshot.cs b/src/Predictalytics.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
index ff72cfb..4b4f327 100644
--- a/src/Predictalytics.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
+++ b/src/Predictalytics.Infrastructure/Migrations/AppDbContextModelSnapshot.cs
@@ -463,6 +463,12 @@ namespace Predictalytics.Infrastructure.Migrations
                         .HasPrecision(18, 4)
                         .HasColumnType("decimal(18,4)");
 
+                    b.Property<decimal?>("FollowerFillPrice10s")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal?>("FollowerFillPrice60s")
+                        .HasColumnType("decimal(65,30)");
+
                     b.Property<decimal?>("PriceAfter1m")
                         .HasPrecision(18, 4)
                         .HasColumnType("decimal(18,4)");
@@ -710,6 +716,12 @@ namespace Predictalytics.Infrastructure.Migrations
                         .HasPrecision(8, 4)
                         .HasColumnType("decimal(8,4)");
 
+                    b.Property<decimal>("CopytradingCopyabilityScore")
+                        .HasColumnType("decimal(65,30)");
+
+                    b.Property<decimal>("CopytradingQualityScore")
+                        .HasColumnType("decimal(65,30)");
+
                     b.Property<decimal>("CopytradingScore")
                         .HasPrecision(8, 4)
                         .HasColumnType("decimal(8,4)");
diff --git a/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs b/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs
index 70705dd..5be708c 100644
--- a/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs
+++ b/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketApiClient.cs
@@ -46,9 +46,9 @@ public class PolymarketApiClient
         return await ExecuteWithRetryAsync<List<PolymarketTradeResponse>>(_client, url, "Data", ct) ?? [];
     }
 
-    public async Task<List<PolymarketTradeResponse>> GetMarketTradesAsync(string conditionId, int limit = 1000, CancellationToken ct = default)
+    public async Task<List<PolymarketTradeResponse>> GetMarketTradesAsync(string conditionId, int limit = 1000, int offset = 0, CancellationToken ct = default)
     {
-        var url = $"/trades?condition_id={conditionId}&limit={limit}";
+        var url = $"/trades?condition_id={conditionId}&limit={limit}&offset={offset}";
         return await ExecuteWithRetryAsync<List<PolymarketTradeResponse>>(_client, url, "Data", ct) ?? [];
     }
 
diff --git a/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs b/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs
index 2cc58c3..76764f7 100644
--- a/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs
+++ b/src/Predictalytics.Infrastructure/Providers/Polymarket/PolymarketProvider.cs
@@ -65,7 +65,7 @@ public class PolymarketProvider : IPlatformProvider
 
     public async Task<IReadOnlyList<Trade>> GetMarketTradesAsync(string platformMarketId, int limit = 1000, CancellationToken ct = default)
     {
-        var raw = await _api.GetMarketTradesAsync(platformMarketId, limit, ct);
+        var raw = await _api.GetMarketTradesAsync(platformMarketId, limit, 0, ct);
         _logger.LogInformation("Fetched {Count} trades for Market {Market} (limit={Limit})", raw.Count, platformMarketId, limit);
 
         var mappedTrades = raw.Select(r =>
diff --git a/src/Predictalytics.Infrastructure/Services/CopytradingBacktestHarness.cs b/src/Predictalytics.Infrastructure/Services/CopytradingBacktestHarness.cs
new file mode 100644
index 0000000..9290986
--- /dev/null
+++ b/src/Predictalytics.Infrastructure/Services/CopytradingBacktestHarness.cs
@@ -0,0 +1,100 @@
+using Predictalytics.Application.Interfaces;
+using Predictalytics.Domain.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Predictalytics.Infrastructure.Services;
+
+public class CopytradingBacktestHarness : ICopytradingBacktestHarness
+{
+    private readonly ICopytradingEstimator _estimator;
+
+    public CopytradingBacktestHarness(ICopytradingEstimator estimator)
+    {
+        _estimator = estimator;
+    }
+
+    public async Task<List<BacktestResult>> RunLatencySweepAsync(Trader trader, IReadOnlyList<Trade> trades, CancellationToken ct = default)
+    {
+        var results = new List<BacktestResult>();
+        int[] latencies = new[] { 0, 10, 30, 60 };
+
+        var events = _estimator.ClusterTradesIntoEvents(trades, TimeSpan.FromHours(24));
+        var buyEvents = events.Where(e => e.Side == Predictalytics.Domain.Enums.TradeSide.Buy).ToList();
+
+        foreach (int latency in latencies)
+        {
+            decimal followerPnl = 0;
+            decimal traderPnl = 0;
+            decimal totalRisked = 0;
+
+            foreach (var e in buyEvents)
+            {
+                var sampleTrade = e.ConstituentTrades.First();
+                var market = sampleTrade.DbMarket;
+                var outcome = sampleTrade.MarketOutcome;
+
+                decimal resolutionPrice = 0;
+                bool isResolved = market?.IsResolved ?? false;
+
+                if (isResolved)
+                {
+                    resolutionPrice = string.Equals(market?.ResolutionOutcome, sampleTrade.Outcome, StringComparison.OrdinalIgnoreCase) ? 1.0m : 0.0m;
+                }
+                else
+                {
+                    resolutionPrice = outcome?.CurrentPrice ?? e.AveragePrice;
+                }
+
+                // Calculate Trader PnL
+                decimal entryPrice = e.AveragePrice;
+                decimal size = e.TotalSize;
+                decimal eventTraderPnl = (resolutionPrice - entryPrice) * size;
+                
+                traderPnl += eventTraderPnl;
+                totalRisked += entryPrice * size;
+
+                // Calculate Follower PnL
+                decimal eventFollowerPnl = 0;
+                
+                foreach (var t in e.ConstituentTrades)
+                {
+                    // For latency 0, we assume perfect fill (which is unrealistic, but serves as baseline)
+                    decimal followerFill = t.Price;
+
+                    if (latency > 0)
+                    {
+                        var fill = await _estimator.EstimateFollowerFillPriceAsync(t, latency, ct);
+                        if (fill.HasValue)
+                        {
+                            followerFill = fill.Value;
+                        }
+                    }
+
+                    eventFollowerPnl += (resolutionPrice - followerFill) * t.Size;
+                }
+                
+                followerPnl += eventFollowerPnl;
+            }
+
+            decimal alphaDecay = 0;
+            if (traderPnl != 0)
+            {
+                alphaDecay = (traderPnl - followerPnl) / Math.Abs(traderPnl) * 100m;
+            }
+
+            results.Add(new BacktestResult
+            {
+                LatencySeconds = latency,
+                TraderPnl = traderPnl,
+                HypotheticalFollowerPnl = followerPnl,
+                AlphaDecayPercentage = alphaDecay
+            });
+        }
+
+        return results;
+    }
+}
diff --git a/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs b/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs
new file mode 100644
index 0000000..0b78d9b
--- /dev/null
+++ b/src/Predictalytics.Infrastructure/Services/CopytradingEstimator.cs
@@ -0,0 +1,376 @@
+using Microsoft.Extensions.Logging;
+using Predictalytics.Application.Interfaces;
+using Predictalytics.Domain.Entities;
+using Predictalytics.Infrastructure.Providers.Polymarket;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Predictalytics.Infrastructure.Services;
+
+public class CopytradingEstimator : ICopytradingEstimator
+{
+    private readonly ILogger<CopytradingEstimator> _logger;
+    private readonly PolymarketApiClient _polymarketClient;
+    private readonly IRateLimiter _rateLimiter;
+
+    public CopytradingEstimator(ILogger<CopytradingEstimator> logger, PolymarketApiClient polymarketClient, IRateLimiter rateLimiter)
+    {
+        _logger = logger;
+        _polymarketClient = polymarketClient;
+        _rateLimiter = rateLimiter;
+    }
+
+    public async Task<(decimal QualityScore, decimal CopyabilityScore, decimal CombinedScore)> CalculateScoresAsync(
+        Trader trader, 
+        IReadOnlyList<Trade> trades, 
+        CancellationToken ct = default)
+    {
+        if (trades.Count == 0) return (0, 0, 0);
+
+        // 1. Event Clustering
+        var events = ClusterTradesIntoEvents(trades, TimeSpan.FromHours(24));
+
+        decimal qualityScore = CalculateQualityScore(trader, events);
+        decimal copyabilityScore = await CalculateCopyabilityScoreAsync(trader, events, ct);
+
+        // Minimum Quality Gate: if Quality is below 30, it is not highly copyable regardless of copyability.
+        // We do not hard-gate to 0, but we scale it down heavily.
+        
+        // Multiplicative Formula: Both in [0, 100], combined in [0, 100]
+        decimal normalizedQuality = qualityScore / 100m;
+        decimal normalizedCopyability = copyabilityScore / 100m;
+        
+        decimal combinedScore = (normalizedQuality * normalizedCopyability) * 100m;
+        
+        // Hard-gate: If quality is very low, combined score is strictly 0.
+        if (qualityScore < 20)
+        {
+            combinedScore = 0;
+        }
+
+        return (Math.Clamp(Math.Round(qualityScore, 2), 0, 100), 
+                Math.Clamp(Math.Round(copyabilityScore, 2), 0, 100), 
+                Math.Clamp(Math.Round(combinedScore, 2), 0, 100));
+    }
+
+    private decimal CalculateQualityScore(Trader trader, IReadOnlyList<TradeEvent> events)
+    {
+        var buyEvents = events.Where(e => e.Side == Predictalytics.Domain.Enums.TradeSide.Buy).ToList();
+        if (buyEvents.Count == 0) return 0;
+
+        var edges = new List<decimal>();
+
+        foreach (var e in buyEvents)
+        {
+            var sampleTrade = e.ConstituentTrades.First();
+            var market = sampleTrade.DbMarket;
+            var outcome = sampleTrade.MarketOutcome;
+
+            decimal resolutionPrice = 0;
+            bool isResolved = market?.IsResolved ?? false;
+
+            if (isResolved)
+            {
+                resolutionPrice = string.Equals(market?.ResolutionOutcome, sampleTrade.Outcome, StringComparison.OrdinalIgnoreCase) ? 1.0m : 0.0m;
+            }
+            else
+            {
+                // Live market
+                resolutionPrice = outcome?.CurrentPrice ?? e.AveragePrice; // fallback to entry if unknown
+            }
+
+            decimal entryPrice = e.AveragePrice;
+            decimal size = e.TotalSize;
+            decimal risked = entryPrice * size;
+            
+            if (risked > 0)
+            {
+                decimal eventPnl = (resolutionPrice - entryPrice) * size;
+                edges.Add(eventPnl / risked); // Edge for this event (Return on Investment)
+            }
+        }
+
+        if (edges.Count == 0) return 0;
+
+        decimal meanEdge = edges.Average();
+        
+        decimal stdDev = 0;
+        if (edges.Count > 1)
+        {
+            decimal sumOfSquares = edges.Sum(e => (e - meanEdge) * (e - meanEdge));
+            stdDev = (decimal)Math.Sqrt((double)(sumOfSquares / (edges.Count - 1)));
+        }
+
+        decimal standardError = stdDev / (decimal)Math.Sqrt(edges.Count);
+        decimal zScore = 1.645m; // 90% confidence
+        
+        decimal lcbEdge = meanEdge - (zScore * standardError);
+
+        // Convert LCB Edge to a 0-100 score. 
+        // 0% edge = 50. +20% edge = 100. -20% edge = 0.
+        decimal score = 50 + (lcbEdge * 100m * 2.5m); 
+        return Math.Clamp(Math.Round(score, 2), 0, 100);
+    }
+
+    private Task<decimal> CalculateCopyabilityScoreAsync(Trader trader, IReadOnlyList<TradeEvent> events, CancellationToken ct)
+    {
+        if (events.Count == 0) return Task.FromResult(0m);
+
+        var alphaDecays = new List<decimal>();
+        var sizes = new List<decimal>();
+
+        foreach (var e in events)
+        {
+            decimal eventDecay = 0;
+            decimal totalTradeSize = 0;
+
+            foreach (var t in e.ConstituentTrades)
+            {
+                sizes.Add(t.Amount); // USD equivalent sizing
+
+                if (t.Context?.FollowerFillPrice10s.HasValue == true && t.Price > 0)
+                {
+                    decimal slippage = 0;
+                    if (t.Side == Predictalytics.Domain.Enums.TradeSide.Buy)
+                    {
+                        slippage = t.Context.FollowerFillPrice10s.Value - t.Price; // Positive slippage = price went up (we buy higher)
+                    }
+                    else
+                    {
+                        slippage = t.Price - t.Context.FollowerFillPrice10s.Value; // Positive slippage = price went down (we sell lower)
+                    }
+                    
+                    // slippage as a percentage of price
+                    decimal decayPct = slippage / t.Price;
+                    eventDecay += decayPct * t.Size;
+                    totalTradeSize += t.Size;
+                }
+            }
+
+            if (totalTradeSize > 0)
+            {
+                alphaDecays.Add(eventDecay / totalTradeSize);
+            }
+        }
+
+        // 1. Alpha Decay Score
+        decimal averageDecay = alphaDecays.Count > 0 ? alphaDecays.Average() : 0;
+        
+        // Convert averageDecay to score.
+        // If average decay is <= 0%, score is 100.
+        // If average decay is 10% (0.10), score is 0.
+        decimal decayScore = 100m - (averageDecay * 1000m); // 0.10 * 1000 = 100
+        decayScore = Math.Clamp(decayScore, 0, 100);
+
+        // 2. Sizing Consistency Score
+        decimal sizingScore = 50;
+        if (sizes.Count > 1)
+        {
+            decimal meanSize = sizes.Average();
+            decimal sumOfSquares = sizes.Sum(s => (s - meanSize) * (s - meanSize));
+            decimal stdDev = (decimal)Math.Sqrt((double)(sumOfSquares / (sizes.Count - 1)));
+            
+            decimal cv = stdDev / (meanSize == 0 ? 1 : meanSize); // Coefficient of Variation
+            
+            // CV of 0 = 100 score. CV of 1.0 = 50 score. CV of 2.0 = 0 score.
+            sizingScore = 100m - (cv * 50m);
+            sizingScore = Math.Clamp(sizingScore, 0, 100);
+        }
+
+        decimal combined = (decayScore * 0.7m) + (sizingScore * 0.3m);
+        return Task.FromResult(Math.Clamp(Math.Round(combined, 2), 0, 100));
+    }
+
+    public async Task<decimal?> EstimateFollowerFillPriceAsync(
+        Trade traderTrade, 
+        int latencySeconds = 10, 
+        CancellationToken ct = default)
+    {
+        if (string.IsNullOrEmpty(traderTrade.MarketId)) return null;
+
+        await _rateLimiter.WaitAsync(Predictalytics.Domain.Enums.PlatformType.Polymarket, ct);
+        
+        long tradeUnix = ((DateTimeOffset)traderTrade.ExecutedAt).ToUnixTimeSeconds();
+        long windowStart = tradeUnix + latencySeconds;
+        long windowEnd = windowStart + 120; // 2 minutes window to get filled
+
+        var tape = new List<PolymarketTradeResponse>();
+        int limit = 1000;
+        int offset = 0;
+        
+        while (true)
+        {
+            var page = await _polymarketClient.GetMarketTradesAsync(traderTrade.MarketId, limit, offset, ct);
+            if (page.Count == 0) break;
+            
+            var filtered = page.Where(p => 
+                !string.Equals(p.ProxyWallet, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase) && 
+                !string.Equals(p.User, traderTrade.Trader.PlatformUserId, StringComparison.OrdinalIgnoreCase))
+                .ToList();
+
+            tape.AddRange(filtered);
+            
+            var oldestInPage = page.Last().Timestamp;
+            if (oldestInPage < tradeUnix) 
+            {
+                break; // We have gone back far enough
+            }
+            offset += limit;
+        }
+
+        var relevantTrades = tape
+            .Where(t => t.Asset == traderTrade.AssetId && t.Timestamp >= windowStart && t.Timestamp <= windowEnd)
+            .OrderBy(t => t.Timestamp)
+            .ToList();
+
+        if (relevantTrades.Count == 0) return null;
+
+        decimal remainingSize = traderTrade.Size;
+        decimal totalValue = 0;
+        decimal totalSizeFilled = 0;
+
+        foreach (var t in relevantTrades)
+        {
+            decimal sizeAvailable = (decimal)t.Size;
+            decimal fillSize = Math.Min(remainingSize, sizeAvailable);
+            
+            totalValue += fillSize * (decimal)t.Price;
+            totalSizeFilled += fillSize;
+            remainingSize -= fillSize;
+
+            if (remainingSize <= 0) break;
+        }
+
+        if (totalSizeFilled == 0) return null;
+
+        return totalValue / totalSizeFilled;
+    }
+
+    public IReadOnlyList<TradeEvent> ClusterTradesIntoEvents(IReadOnlyList<Trade> trades, TimeSpan window)
+    {
+        var events = new List<TradeEvent>();
+        
+        var grouped = trades.GroupBy(t => new { t.MarketId, t.AssetId, t.Side });
+
+        foreach (var group in grouped)
+        {
+            var ordered = group.OrderBy(t => t.ExecutedAt).ToList();
+            TradeEvent? currentEvent = null;
+
+            foreach (var trade in ordered)
+            {
+                if (currentEvent == null || trade.ExecutedAt - currentEvent.EventStartTime > window)
+                {
+                    if (currentEvent != null) events.Add(currentEvent);
+                    
+                    currentEvent = new TradeEvent
+                    {
+                        MarketId = trade.MarketId,
+                        AssetId = trade.AssetId ?? "",
+                        Side = trade.Side,
+                        EventStartTime = trade.ExecutedAt,
+                        EventEndTime = trade.ExecutedAt,
+                        ConstituentTrades = new List<Trade> { trade },
+                        AveragePrice = trade.Price,
+                        TotalSize = trade.Size
+                    };
+                }
+                else
+                {
+                    currentEvent.ConstituentTrades.Add(trade);
+                    currentEvent.EventEndTime = trade.ExecutedAt;
+                    
+                    // Update VWAP
+                    decimal newTotalSize = currentEvent.TotalSize + trade.Size;
+                    decimal totalValue = (currentEvent.AveragePrice * currentEvent.TotalSize) + (trade.Price * trade.Size);
+                    currentEvent.AveragePrice = totalValue / newTotalSize;
+                    currentEvent.TotalSize = newTotalSize;
+                }
+            }
+
+            if (currentEvent != null)
+            {
+                events.Add(currentEvent);
+            }
+        }
+
+        return events.OrderBy(e => e.EventStartTime).ToList();
+    }
+
+    public async Task<decimal?> CalculateMaeAsync(TradeEvent tradeEvent, CancellationToken ct = default)
+    {
+        if (string.IsNullOrEmpty(tradeEvent.MarketId)) return null;
+
+        await _rateLimiter.WaitAsync(Predictalytics.Domain.Enums.PlatformType.Polymarket, ct);
+        
+        long startUnix = tradeEvent.EventStartTime.ToUnixTimeSeconds();
+        // Determine end of holding period. Since we don't have sell trades linked natively, 
+        // we'll just check MAE over the next 7 days or until now, whichever is shorter. 
+        // (A more accurate implementation would need to match buys with sells to find the holding period)
+        long endUnix = Math.Min(DateTimeOffset.UtcNow.ToUnixTimeSeconds(), startUnix + (7 * 24 * 3600));
+
+        var tape = new List<PolymarketTradeResponse>();
+        int limit = 1000;
+        int offset = 0;
+        
+        while (true)
+        {
+            var page = await _polymarketClient.GetMarketTradesAsync(tradeEvent.MarketId, limit, offset, ct);
+            if (page.Count == 0) break;
+            
+            tape.AddRange(page);
+            
+            var oldestInPage = page.Last().Timestamp;
+            if (oldestInPage < startUnix) 
+            {
+                break;
+            }
+            offset += limit;
+        }
+
+        var relevantTrades = tape
+            .Where(t => t.Asset == tradeEvent.AssetId && t.Timestamp >= startUnix && t.Timestamp <= endUnix)
+            .ToList();
+
+        if (relevantTrades.Count == 0) return null;
+
+        decimal mae = 0;
+
+        // VWAP of the event is the entry price
+        decimal entryPrice = tradeEvent.AveragePrice;
+
+        foreach (var t in relevantTrades)
+        {
+            decimal price = (decimal)t.Price;
+            decimal unrealizedLoss = 0;
+
+            if (tradeEvent.Side == Predictalytics.Domain.Enums.TradeSide.Buy)
+            {
+                // Buy -> loss if price drops
+                if (price < entryPrice)
+                {
+                    unrealizedLoss = entryPrice - price;
+                }
+            }
+            else
+            {
+                // Sell -> loss if price rises
+                if (price > entryPrice)
+                {
+                    unrealizedLoss = price - entryPrice;
+                }
+            }
+
+            if (unrealizedLoss > mae)
+            {
+                mae = unrealizedLoss;
+            }
+        }
+
+        // Return MAE as a percentage of entry price or absolute? Absolute is often easier for 0-1 bounded prices.
+        return mae;
+    }
+}
diff --git a/src/Predictalytics.Worker/Services/TradeContextEnrichmentWorker.cs b/src/Predictalytics.Worker/Services/TradeContextEnrichmentWorker.cs
index 6a11a5f..b07b3d4 100644
--- a/src/Predictalytics.Worker/Services/TradeContextEnrichmentWorker.cs
+++ b/src/Predictalytics.Worker/Services/TradeContextEnrichmentWorker.cs
@@ -38,8 +38,10 @@ public class TradeContextEnrichmentWorker : BackgroundService
                 var polymarketClient = scope.ServiceProvider.GetRequiredService<PolymarketApiClient>();
                 var rateLimiter = scope.ServiceProvider.GetRequiredService<IRateLimiter>();
 
+                var estimator = scope.ServiceProvider.GetRequiredService<ICopytradingEstimator>();
+
                 // Fetch a batch of unenriched trades
-                var unenrichedTrades = await tradeRepo.GetTradesForContextEnrichmentAsync(500, stoppingToken);
+                var unenrichedTrades = await tradeRepo.GetTradesForContextEnrichmentAsync(50, stoppingToken);
                 
                 if (unenrichedTrades.Count == 0)
                 {
@@ -48,7 +50,7 @@ public class TradeContextEnrichmentWorker : BackgroundService
                     continue;
                 }
 
-                // Group by AssetId to minimize API calls (1 call per asset fetches the whole 1m history)
+                // Group by AssetId to minimize API calls for the history endpoint (if we still use it)
                 var tradesByAsset = unenrichedTrades.GroupBy(t => t.AssetId).ToList();
                 _logger.LogInformation("Enriching {TradeCount} trades across {AssetCount} assets...", unenrichedTrades.Count, tradesByAsset.Count);
 
@@ -64,22 +66,9 @@ public class TradeContextEnrichmentWorker : BackgroundService
                         // Wait for rate limiter to respect global limits
                         await rateLimiter.WaitAsync(Predictalytics.Domain.Enums.PlatformType.Polymarket, stoppingToken);
 
-                        // Fetch the 10-minute history for the entire market (using "max" since "1m" is invalid for full history)
+                        // We still fetch history for PriceBefore1m
                         var history = await polymarketClient.GetPricesHistoryAsync(assetId, "max", stoppingToken);
-                        if (history == null || history.Count == 0)
-                        {
-                            // If history is not available, mark as enriched to prevent infinite loops, 
-                            // but prices remain null.
-                            foreach (var trade in group)
-                            {
-                                trade.IsContextEnriched = true;
-                                await tradeRepo.UpdateAsync(trade, stoppingToken);
-                            }
-                            continue;
-                        }
-
-                        // Order history chronologically for safe binary search / LINQ
-                        var orderedHistory = history.OrderBy(h => h.Timestamp).ToList();
+                        var orderedHistory = history?.OrderBy(h => h.Timestamp).ToList() ?? new List<PriceHistoryEntry>();
 
                         foreach (var trade in group)
                         {
@@ -89,7 +78,7 @@ public class TradeContextEnrichmentWorker : BackgroundService
                             var prePoint = orderedHistory
                                 .LastOrDefault(h => h.Timestamp < tradeTimeUnix);
                             
-                            // Find the closest point AFTER the trade (approx 1 min after)
+                            // Find the closest point AFTER the trade (approx 1 min after) - old logic
                             var postPoint = orderedHistory
                                 .FirstOrDefault(h => h.Timestamp > tradeTimeUnix);
 
@@ -98,12 +87,18 @@ public class TradeContextEnrichmentWorker : BackgroundService
                             trade.PostTradePrice1m = postPoint != null ? (decimal?)postPoint.Price : null;
                             trade.IsContextEnriched = true;
 
+                            // NEW: Calculate exact follower fill prices from Trade Tape
+                            var followerFill10s = await estimator.EstimateFollowerFillPriceAsync(trade, 10, stoppingToken);
+                            var followerFill60s = await estimator.EstimateFollowerFillPriceAsync(trade, 60, stoppingToken);
+
                             // Populate new high-res TradeContext
                             trade.Context = new TradeContext
                             {
                                 TradeId = trade.Id,
                                 PriceBefore1m = prePrice,
                                 PriceAfter1m = trade.PostTradePrice1m,
+                                FollowerFillPrice10s = followerFill10s,
+                                FollowerFillPrice60s = followerFill60s,
                                 EstimatedSlippage = prePrice.HasValue ? Math.Abs(trade.Price - prePrice.Value) : null,
                                 EstimatedOrderType = DetermineOrderType(trade, prePrice)
                             };