{
    "topic": "estfundingrate@PERP_BTC_USDT",
    "ts": 1618820361552,
    "data": {
        "s": "PERP_BTC_USDT",  // symbol
        "r": "1.27988",        // funding rate
        "ft": 1618820360000    // next funding time
        "ts": 1618820200000    // system timestamp
    }
}

​
Topic: estfundingrate@{symbol}

Push interval: 1 min
Subscribe to estimated funding rate of the symbol. 
{
    "topic": "estfundingrate@PERP_BTC_USDT",
    "ts": 1618820361552,
    "data": {
        "s": "PERP_BTC_USDT",  // symbol
        "r": "1.27988",        // funding rate
        "ft": 1618820360000    // next funding time
        "ts": 1618820200000    // system timestamp
    }
}