diff --git a/python/valuecell/agents/common/trading/data/market.py b/python/valuecell/agents/common/trading/data/market.py
index 2e056b6d1..ace266183 100644
--- a/python/valuecell/agents/common/trading/data/market.py
+++ b/python/valuecell/agents/common/trading/data/market.py
@@ -9,6 +9,7 @@
     MarketSnapShotType,
 )
 from valuecell.agents.common.trading.utils import get_exchange_cls, normalize_symbol
+from valuecell.utils.i18n_utils import detect_user_region
 
 from .interfaces import BaseMarketDataSource
 
@@ -24,7 +25,21 @@ class SimpleMarketDataSource(BaseMarketDataSource):
     """
 
     def __init__(self, exchange_id: Optional[str] = None) -> None:
-        self._exchange_id = exchange_id or "binance"
+        if not exchange_id:
+            # Auto-detect region and select appropriate exchange
+            region = detect_user_region()
+            if region == "us":
+                # Use OKX for United States users (best support for USDT perpetuals)
+                self._exchange_id = "okx"
+                logger.info(
+                    "Detected US region, using okx exchange (USDT perpetuals supported)"
+                )
+            else:
+                # Use regular Binance for other regions
+                self._exchange_id = "binance"
+                logger.info("Detected non-US region, using binance exchange")
+        else:
+            self._exchange_id = exchange_id
 
     def _normalize_symbol(self, symbol: str) -> str:
         """Normalize symbol format for specific exchanges.
diff --git a/python/valuecell/utils/i18n_utils.py b/python/valuecell/utils/i18n_utils.py
index 796ace120..6e6ab6b71 100644
--- a/python/valuecell/utils/i18n_utils.py
+++ b/python/valuecell/utils/i18n_utils.py
@@ -65,6 +65,31 @@ def detect_browser_language(accept_language_header: str) -> str:
     return DEFAULT_LANGUAGE
 
 
+def detect_user_region() -> str:
+    """Detect user region based on IP geolocation.
+
+    Returns:
+        Region code: 'us' for United States, 'default' for others
+    """
+    try:
+        import httpx
+
+        with httpx.Client(timeout=3.0) as client:
+            resp = client.get("https://ipapi.co/json/")
+            if resp.status_code == 200:
+                data = resp.json()
+                country_code = data.get("country_code", "").upper()
+
+                if country_code == "US":
+                    return "us"
+
+                return "default"
+            return "default"
+    except Exception:
+        # If detection fails, return default
+        return "default"
+
+
 def get_timezone_for_language(language: str) -> str:
     """Get default timezone for a language.