Best Bid/Ask Price (BBO)

Subscribe to real-time best bid and ask prices for futures.

Subscription Format

{symbol}@book_ticker

Subscribe Request

{
  "action": "subscribe",
  "streams": ["BTCUSD@book_ticker"]
}

Push Data Fields

Field	Type	Description
s	string	Contract symbol
u	int64	Update ID
b	string	Best bid price
B	string	Best bid quantity
a	string	Best ask price
A	string	Best ask quantity
t	int64	Timestamp

Push Example

{
  "action": "book_ticker",
  "result": {
    "s": "BTCUSD",
    "u": 123456,
    "b": "50100.00",
    "B": "10",
    "a": "50120.00",
    "A": "8",
    "t": 1736163000000
  }
}