AsyncAPI channel · Fortnox · Fortnox Topics WebSocket API

/topics-v1

The single WebSocket channel. The client publishes control commands (currently `add-tenants-v1`) to subscribe tenants and set replay offsets, and subscribes to the resulting change-notification events pushed by Fortnox across all subscribed topics.

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

Channel address

/topics-v1

Operations

publish
sendCommand
Send a control command to the WebSocket (e.g. add tenants).
receiveTopicEvent
Receive pushed change-notification events.

Messages

AddTenantsCommand
Subscribe one or more tenants (integration keys) to the stream.
Content-Type: application/json
TopicEvent
A minimal "what changed" event on a domain topic.
Content-Type: application/json

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/topics-v1"
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.