AsyncAPI channel · KuCoin · KuCoin Public WebSocket API

/

Single multiplexed WebSocket connection. All KuCoin streaming traffic flows over one connection; topics are subscribed/unsubscribed via JSON control messages and inbound messages are routed by their `topic` and `subject` fields.

Open source AsyncAPI → All KuCoin channels KuCoin provider profile
Provider: KuCoin AsyncAPI: v2.6.0 Spec: KuCoin Public WebSocket API Operations: 2 Messages: 24

Channel address

/

Operations

publish
clientToServer
Control and heartbeat messages sent by the client.
serverToClient
Server-pushed envelopes (welcome, ack, pong, market data, private data).

Messages

subscribe
Subscribe to a topic. Some topics support a comma-separated list of symbols (up to 100).
Content-Type:
unsubscribe
Unsubscribe from a topic.
Content-Type:
ping
Heartbeat. Must be sent every `pingInterval` ms returned by /api/v1/bullet-public.
Content-Type:
welcome
First message from server after the WebSocket handshake. The connection is only usable after this message is received.
Content-Type:
ack
Sent when the client requested `"response": true` on subscribe/unsubscribe.
Content-Type:
pong
Reply to a client ping.
Content-Type:
error
Server-side error envelope.
Content-Type:
symbolTicker
Topic: `/market/ticker:{symbol}` — pushed at most once every 100ms.
Content-Type:
allSymbolsTicker
Topic: `/market/ticker:all` — ticker updates for every symbol, subject is the symbol code.
Content-Type:
symbolSnapshot
Topic: `/market/snapshot:{symbol}` — pushed every 2s.
Content-Type:
marketSnapshot
Topic: `/market/snapshot:{market}` — pushed every 2s for every symbol in a market (e.g. `BTC`, `USDS`).
Content-Type:
level1
Topic: `/spotMarket/level1:{symbol}` — pushed at most once every 10ms when top-of-book changes.
Content-Type:
level2
Topic: `/market/level2:{symbol}` — real-time incremental updates. Subject `trade.l2update`.
Content-Type:
level2Depth5
Topic: `/spotMarket/level2Depth5:{symbol}` — pushed at most once every 100ms.
Content-Type:
level2Depth50
Topic: `/spotMarket/level2Depth50:{symbol}` — pushed at most once every 100ms.
Content-Type:
klines
Topic: `/market/candles:{symbol}_{type}` — real-time OHLCV updates. Type is one of 1min,3min,15min,30min,1hour,2hour,4hour,6hour,8hour,12hour,1day,1week.
Content-Type:
match
Topic: `/market/match:{symbol}` — real-time Level 3 trade matches. Subject `trade.l3match`.
Content-Type:
indexPrice
Topic: `/indicator/index:{symbol}` — pushed once per second.
Content-Type:
markPrice
Topic: `/indicator/markPrice:{symbol}` — pushed once per second.
Content-Type:
tradeOrders
Topic: `/spotMarket/tradeOrders` — real-time order lifecycle events. Requires private token.
Content-Type:
tradeOrdersV2
Topic: `/spotMarket/tradeOrdersV2` — real-time order lifecycle events with additional update events. Requires private token.
Content-Type:
accountBalance
Topic: `/account/balance` — real-time balance changes. Requires private token.
Content-Type:
crossMarginPosition
Topic: `/margin/position` — debt ratio and position status updates. Requires private token.
Content-Type:
isolatedMarginPosition
Topic: `/margin/isolatedPosition:{symbol}` — isolated margin position changes. Requires private token.
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/untitled"
All event channels 
curl "https://apis.io/api/v1/channels?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no email required.

GitHub Google LinkedIn

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