book~{instrument_name}

CHANNEL wss://stream.crypto.com/fcm/v1/market
book~{instrument_name}

Order book (L2). Subscribe with channel e.g. ["book~BTCUSD-PERP"].

Request

required

id integerrequired

Request id

method stringrequired

Possible values: [subscribe]

params objectrequired

channels string[]required

e.g. ["book~BTCUSD-PERP"]

nonce integerrequired

Current timestamp in milliseconds

WebSocket response

Schema

id int64

method string

code int32

result object

instrument_name string

subscription string

channel string

data object[]

Array [

asks array[]

Ask levels (snapshot).

bids array[]

Bid levels (snapshot).

t int64

Timestamp (snapshot), ms, e.g. "1771761038000".

tt int64

Timestamp (snapshot), ms, e.g. "1771761038000".

u int64

Sequence (snapshot).

update object

Delta; has asks/bids.

pu int64

Previous sequence (delta).

]