Update main.py

main.py

@@ -44,7 +44,7 @@ async def get_stocks_data(ticker: str, intervals: int, days: int):
 @app.get('/chain')
 async def get_stocks_data(ticker: str):
     try:
-        response, exp = fetcher.fetch_option_chain(chain).to_dict(orient="records")
+        response, exp = fetcher.fetch_option_chain(ticker).to_dict(orient="records")
         return {"data" : response}
     except:
         return {"Timeout" : "Error"}