diff --git a/python/configs/providers/openrouter.yaml b/python/configs/providers/openrouter.yaml
index 2f89555ec..27e76d08f 100644
--- a/python/configs/providers/openrouter.yaml
+++ b/python/configs/providers/openrouter.yaml
@@ -38,7 +38,7 @@ models:
   - id: "google/gemini-3-pro-preview"
     name: "Gemini 3 Pro Preview"
   - id: "x-ai/grok-4.1-fast"
-    name: "Grok 4.1 Fast(free)"
+    name: "Grok 4.1 Fast"
 
 # ============================================
 # Embedding Models Configuration
diff --git a/python/valuecell/server/api/routers/strategy_agent.py b/python/valuecell/server/api/routers/strategy_agent.py
index fc3133590..ec0aa6ac3 100644
--- a/python/valuecell/server/api/routers/strategy_agent.py
+++ b/python/valuecell/server/api/routers/strategy_agent.py
@@ -14,6 +14,7 @@
     StrategyStatus,
     StrategyStatusContent,
     StrategyType,
+    TradingMode,
     UserRequest,
 )
 from valuecell.config.loader import get_config_loader
@@ -73,6 +74,15 @@ def _safe_config_dump(req: UserRequest) -> dict:
             request.trading_config.initial_free_cash = (
                 request.trading_config.initial_capital
             )
+            if (
+                request.exchange_config.trading_mode == TradingMode.VIRTUAL
+                and request.exchange_config.exchange_id not in {None, ""}
+            ):
+                logger.warning(
+                    "Virtual trading requested on non-default exchange_id '{}'. Ensure this is intended.",
+                    request.exchange_config.exchange_id,
+                )
+                request.exchange_config.exchange_id = None
             # Ensure we only serialize the core UserRequest fields, excluding conversation_id
             user_request = UserRequest(
                 llm_model_config=request.llm_model_config,