Open Interest & option Chain data

Nifty & Bank Nifty discussions
1

Hello,
Which is a good source for accessing option chain and open interest for BankNifty.
I see that there is a huge gap of OI between nse website & quantsapp option chain.
Can you please help me which should be used for assessing OI

thanks
Mohana

2

Rely on NSE website, It’s the exchange. The data is updated in 3 min intervals.

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