BBO

Best bid and offer (top of book).

Pushed in real-time whenever the best bid or ask price changes. Useful for tight spread monitoring and quote-driven strategies.

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Subscribe

JSON

{
    "event": "subscribe",
    "arg": [{ "channel": "BBO", "sym": "BINANCE_PERP_BTC_USDT" }]
}

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Push Data

JSON

{
    "arg": { "channel": "BBO", "sym": "BINANCE_PERP_BTC_USDT" },
    "data": {
        "bid": "70283.60",
        "bidqty": "0.117",
        "ask": "70283.50",
        "askqty": "8.575",
        "ts": "1774331552771"
    }
}

Field	Description
bid	Best bid price
bidqty	Best bid quantity
ask	Best ask price
askqty	Best ask quantity
ts	Timestamp (ms)