標記價格

{
    "topic": "/indicator/markPrice:USDT-BTC",
    "type": "message",
    "subject": "tick",
    "data": {
        "symbol": "USDT-BTC",
        "granularity": 1000,
        "value": 0.000011820000000,
        "timestamp": 1740840036000
    }
}