訂單簿 - 深度 1

{
    "topic": "/spotMarket/level1:BTC-USDT",
    "type": "message",
    "subject": "level1",
    "data": {
        "asks": [
            "68145.8", //price
            "0.51987471" //size
        ],  
        "bids": [
            "68145.7",
            "1.29267802"
        ],
        "timestamp": 1729816058766
    }
}