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Topic: openinterest@{symbol}

Push interval: push every 1 second if open interest change and 10 seconds force update even if no change.
Subscribe to open interest. 
{
  "id": .....
  "cmd": "SUBSCRIBE",
  "params": ["openinterest@PERP_BTC_USDT"]
}

{
    "topic": "openinterest@PERP_BTC_USDT",
    "ts": 1618820361552,
    "data": {
        "s": "PERP_BTC_USDT",  // symbol
        "oi": "936.37",        // open interest
        "ts": 1618820200000    // time of last update
    }
}