diff --git a/CLAUDE.md b/CLAUDE.md
index 809d4f16..79d29a2e 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -57,8 +57,8 @@ ssh -L 5432:127.0.0.1:5432 kjh2064@178.104.200.7
 cd D:\JobRoomz\KArtSell.Aegis
 
 # Set actual API keys from Gitea Secrets (not test keys!)
-$env:KRX_API_KEY = "<actual-krx-api-key>"
-$env:OPENDART_API_KEY = "<actual-opendart-api-key>"
+$env:KRX_OPENAPI = "<actual-krx-api-key>"
+$env:OPENDART_API = "<actual-opendart-api-key>"
 $env:KIS_API_KEY = "<actual-kis-api-key>"
 
 # CRITICAL: Run with --configuration Debug (DEVELOPMENT mode)
diff --git a/src/KArtSell.Host/Observability/OpenDartService.cs b/src/KArtSell.Host/Observability/OpenDartService.cs
index c90fcfe0..7328c45c 100644
--- a/src/KArtSell.Host/Observability/OpenDartService.cs
+++ b/src/KArtSell.Host/Observability/OpenDartService.cs
@@ -43,7 +43,7 @@ public class OpenDartService
         _dataSource = dataSource;
         _httpClient = httpClient;
         _clock = clock;
-        _apiKey = Environment.GetEnvironmentVariable("OPENDART_API_KEY") ?? throw new InvalidOperationException("OPENDART_API_KEY required");
+        _apiKey = Environment.GetEnvironmentVariable("OPENDART_API") ?? throw new InvalidOperationException("OPENDART_API required");
         _logger = logger;
     }
 
diff --git a/src/KArtSell.Host/Program.cs b/src/KArtSell.Host/Program.cs
index 18a12d9e..6ce13f1a 100644
--- a/src/KArtSell.Host/Program.cs
+++ b/src/KArtSell.Host/Program.cs
@@ -52,8 +52,8 @@ var connectionString = ResolveSecret(
 
 var krxApiKey = ResolveSecret(
     builder.Configuration["ExternalApis:KrxOpenApi:ApiKey"],
-    "KRX_API_KEY")
-    ?? throw new InvalidOperationException("KRX_API_KEY is required. Set via Gitea Actions Secrets or environment.");
+    "KRX_OPENAPI")
+    ?? throw new InvalidOperationException("KRX_OPENAPI is required. Set via Gitea Actions Secrets or environment.");
 
 var modelOperationsDispatcherEnabled = builder.Configuration.GetValue<bool>("ModelOperations:DispatcherEnabled");
 var modelOperationsDispatcherCron = builder.Configuration["ModelOperations:DispatcherCron"] ?? "*/15 * * * *";
diff --git a/src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KrxDataService.cs b/src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KrxDataService.cs
index d0a0fce9..63d17d99 100644
--- a/src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KrxDataService.cs
+++ b/src/KArtSell.Modules.ModelOperations/ShadowRun/Services/KrxDataService.cs
@@ -159,11 +159,11 @@ public sealed class KrxDataService : IKrxDataService
         CancellationToken cancellationToken)
     {
         // Real KRX OpenAPI: Stock Price endpoint
-        var apiKey = Environment.GetEnvironmentVariable("KRX_API_KEY") ?? "";
+        var apiKey = Environment.GetEnvironmentVariable("KRX_OPENAPI") ?? "";
 
         if (string.IsNullOrEmpty(apiKey))
         {
-            _logger.LogWarning("KRX_API_KEY not set, using stub data");
+            _logger.LogWarning("KRX_OPENAPI not set, using stub data");
             // Fallback to stub for local development (KRX format)
             await Task.Delay(100, cancellationToken);
             return $$"""
diff --git a/tests/KArtSell.Integration.Tests/OpenDartServiceTests.cs b/tests/KArtSell.Integration.Tests/OpenDartServiceTests.cs
index a1f3bf04..5e472b06 100644
--- a/tests/KArtSell.Integration.Tests/OpenDartServiceTests.cs
+++ b/tests/KArtSell.Integration.Tests/OpenDartServiceTests.cs
@@ -15,8 +15,8 @@ public class OpenDartServiceTests : IAsyncLifetime
     {
         _dataSource = fixture.DataSource;
         // Set test API key to avoid initialization error
-        if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("OPENDART_API_KEY")))
-            Environment.SetEnvironmentVariable("OPENDART_API_KEY", "test-key-12345");
+        if (string.IsNullOrEmpty(Environment.GetEnvironmentVariable("OPENDART_API")))
+            Environment.SetEnvironmentVariable("OPENDART_API", "test-key-12345");
         _service = new OpenDartService(_dataSource, new HttpClient(), fixture.Clock(), fixture.Logger<OpenDartService>());
     }