L1 Book
Best bid and ask (top of book), sent as periodic snapshots.
{"method": "subscribe", "subscription": {"type": "l1Book", "coin": "BTC"}}The interval field is optional (default "500ms"). Valid values: "200ms", "500ms", "1s".
Data format: L1BookData
{"channel": "l1Book", "data": {"coin": "BTC", "time": 1699900000000, "bid": {"px": "65000.0", "sz": "1.5", "n": 3}, "ask": {"px": "65001.0", "sz": "1.0", "n": 2}}}