AsyncAPI channel · Bitfinex · Bitfinex WebSocket API v2

/book

Aggregated order book channel. Subscription parameters: `prec` (P0/P1/P2/P3/P4, default P0), `freq` (F0 realtime or F1 every 2s, default F0), `len` (1/25/100/250, default 25), and optional client-defined `subId`. For funding books the AMOUNT sign convention is inverted (negative = bid, positive = ask).

Open source AsyncAPI → All Bitfinex channels Bitfinex provider profile
Provider: Bitfinex AsyncAPI: v2.6.0 Spec: Bitfinex WebSocket API v2 Operations: 2 Messages: 8

Channel address

/book

Operations

publish
subscribeBook
receiveBook

Messages

SubscribeBook
Subscribe (book)
Content-Type:
Unsubscribe
Unsubscribe from a channel
Content-Type:
TradingBookSnapshot
Aggregated trading book snapshot
Content-Type:
TradingBookUpdate
Aggregated trading book update
Content-Type:
FundingBookSnapshot
Aggregated funding book snapshot
Content-Type:
FundingBookUpdate
Aggregated funding book update
Content-Type:
ChecksumMessage
[CHANNEL_ID, "cs", CHECKSUM] - emitted when OB_CHECKSUM is enabled.
Content-Type:
Heartbeat
[CHANNEL_ID, "hb"] - sent every 15 seconds of inactivity.
Content-Type:

About AsyncAPI

The AsyncAPI specification describes event-driven APIs the way OpenAPI describes request/response APIs. A channel is the named pipe — a webhook URL, a Kafka topic, a WebSocket route, an MQTT subject — that producers and consumers publish or subscribe to. Each channel carries one or more messages with structured payloads, and an operation declares whether a given party sends or receives on that channel.

Browse every event-driven channel on the APIs.io network or compare with the broader Agent Skill and MCP server surfaces of the same providers.

Work with this as data

Every channel here is available over the APIs.io API and to AI agents over MCP.

MCP server

One button, every client — Claude, Cursor, VS Code and the rest.

https://apis.io/mcp

Tools for event channels

4 MCP tools reach this
  • find_channelsBrowse and filter every channel in the catalog.
  • apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
  • resolveTurn a domain, URL or GitHub org into the provider it belongs to.
  • find_cohortsEvery scored population of providers in the catalog.
All 92 tools →

Call it yourself

curl for this page
This channel 
curl "https://apis.io/api/v1/channels/book"
All event channels 
curl "https://apis.io/api/v1/channels?limit=25"

Calls without X-API-Key need no key. Calls with it need a paid plan — get a key.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.