Hi I am use below api for fetching option data, and in there I want change in OI but there no node available for that can you tell any specific api which can give change in OI.
https://api-v2.upstox.com/v2/option/chain
You will need to integrate with the websocket and monitor updates for Open Interest (OI) changes.
You can find more details on how to get market data feeds here: Upstox API Documentation - Market Data Feed.
To quickly get started with the websocket, refer to the Sample Implementation provided here: Upstox Sample Implementation.