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Topic: markprice@{symbol}

Push interval: 1s
Subscribe to the mark price of the symbol. 
{
  "id": .....
  "cmd": "SUBSCRIBE",
  "params": ["markprice@PERP_ETH_USDT"]
}

{
    "topic": "markprice@PERP_ETH_USDT",
    "ts": 1618820361552,
    "data": {
        "s": "PERP_ETH_USDT",  // symbol
        "px": "3987.2",        // mark price
        "ts": 1618820361552    // timestamp at which the mark price was calculated
    }
}