Add CoinEx market data client

app/coinex.py

@@ -0,0 +1,25 @@
+from typing import Any
+import httpx
+
+
+class CoinExClient:
+    def __init__(self, api_base: str) -> None:
+        self.api_base = api_base.rstrip('/')
+
+    async def get_kline(self, market: str, period: str = '1min', limit: int = 100) -> dict[str, Any]:
+        params = {
+            'market': market.upper(),
+            'period': period,
+            'limit': max(1, min(limit, 1000)),
+        }
+        async with httpx.AsyncClient(timeout=10.0) as client:
+            response = await client.get(f'{self.api_base}/spot/kline', params=params)
+            response.raise_for_status()
+            return response.json()
+
+    async def get_ticker(self, market: str) -> dict[str, Any]:
+        params = {'market': market.upper()}
+        async with httpx.AsyncClient(timeout=10.0) as client:
+            response = await client.get(f'{self.api_base}/spot/ticker', params=params)
+            response.raise_for_status()
+            return response.json()