diff --git a/src/easy_tdx/web/deps.py b/src/easy_tdx/web/deps.py
index a1b8386..a121205 100644
--- a/src/easy_tdx/web/deps.py
+++ b/src/easy_tdx/web/deps.py
@@ -17,7 +17,11 @@ def get_client(request: Request) -> AsyncTdxClient:
 
 def get_mac_client(request: Request) -> Any:
     """从 app.state 获取共享的 AsyncMacClient 实例。"""
-    client: Any = request.app.state.mac_client
+    from easy_tdx.exceptions import TdxConnectionError
+
+    client: Any | None = request.app.state.mac_client
+    if client is None:
+        raise TdxConnectionError("MAC 客户端未连接")
     return client
 
 
diff --git a/src/easy_tdx/web/routers/ex_market.py b/src/easy_tdx/web/routers/ex_market.py
index 09de9a0..fb92b0f 100644
--- a/src/easy_tdx/web/routers/ex_market.py
+++ b/src/easy_tdx/web/routers/ex_market.py
@@ -15,12 +15,13 @@ router = APIRouter(tags=["ex-market"])
 
 
 def _records_to_df_resp(records: list[Any]) -> DataFrameResponse:
-    """将 dataclass 列表转为 DataFrameResponse。"""
+    """将 dataclass 列表转为 DataFrameResponse（过滤内部 _raw 字段）。"""
     import pandas as pd
 
     if not records:
         return DataFrameResponse(data=[], count=0)
-    df = pd.DataFrame([asdict(r) for r in records])
+    rows = [{k: v for k, v in asdict(r).items() if not k.startswith("_")} for r in records]
+    df = pd.DataFrame(rows)
     return DataFrameResponse.from_dataframe(df)