I am using this endpoint https://api.upstox.com/v2/option/chain?instrument_key=NSE_INDEX|Nifty 50&expiry_date=2025-10-07
to fetch option chain attached Screen shot for the same and from the chain i am using “NSE_FO|38397” for strike price 25150 call_options to fetch intraday history but always getting OI as 0 as attached in screen shot
Also OI data is 0 for all the equity stocks history
