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Push interval: 1s 
{
  "id": "clientID8",
  "topic": "PERP_ETH_USDC@markprice",
  "event": "subscribe"
}
Parameters
NameTypeRequiredDescription
idstringYid generate by client
eventstringYsubscribe/unsubscribe
topicstringY{symbol}@markprice
{
  "id": "clientID8",
  "event": "subscribe",
  "success": true,
  "ts": 1682241795883
}

{
  "topic": "PERP_ETH_USDC@markprice",
  "ts": 1682241796000,
  "data": {
    "symbol": "PERP_ETH_USDC",
    "price": 2300.0
  }
}