@Moderator_2 Thank you for your kind and prompt responses. Kindly help how do we fetch open interest for historical data of options. I am using the below line of code but it is showing an error as Historic Api failed: 'Series' object has no attribute 'open_interest' BANKNIFTY20DEC2346000CE Code is as below: historicParam = { "exchange" : symbolInfo.exch_seg, "symboltoken": symbolInfo.token, "interval": "ONE_MINUTE", "fromdate": "2023-12-15 09:15", "todate": "2023-12-15 15:30", } res_json = obj.getCandleData(historicParam) columns = ["timestamp", "open", "high", "low", "close", "volume"] df = pd.DataFrame(res_json["data"], columns= columns ) df["open_interest"] = symbolInfo.open_interest Without Open interest the code works fine. Thanks in advance