# Fortnox Topics WebSocket API

**Canonical:** https://apis.io/apis/fortnox/fortnox-topics-websocket-api/  
**Provider:** Fortnox — https://apis.io/providers/fortnox/  
**Base URL:** wss://ws.fortnox.se/topics-v1  
**Documentation:** https://www.fortnox.se/developer/guides-and-good-to-know/websockets

Fortnox Topics WebSocket API is one of 12 APIs that [Fortnox](https://apis.io/providers/fortnox/) publishes on the [APIs.io](https://apis.io/) network, described by an AsyncAPI event-driven specification. Tagged areas include WebSocket, Event, and Change Notifications. The published artifact set on APIs.io includes API documentation and an AsyncAPI specification.

Duplex WebSocket stream at wss://ws.fortnox.se/topics-v1 that pushes minimal change-notification events across domains (invoices, supplier-invoices, customers, articles, orders, offers, vouchers, projects, and more) so integrations react to changes instead of polling the REST API. Kafka-backed, at-least-once delivery, with per-topic offsets and up to 14-day replay.

## Machine-readable artifacts (3)

- **Documentation** — https://www.fortnox.se/developer/guides-and-good-to-know/websockets
- **AsyncAPI** — https://raw.githubusercontent.com/api-evangelist/fortnox/refs/heads/main/asyncapi/fortnox-asyncapi.yml
- **APIsJSON** — https://raw.githubusercontent.com/api-evangelist/fortnox/refs/heads/main/apis.yml

## Other Fortnox APIs (11)

- [Fortnox Accounts API](https://apis.io/apis/fortnox/fortnox-accounts-api/)
- [Fortnox Articles API](https://apis.io/apis/fortnox/fortnox-articles-api/)
- [Fortnox Customers API](https://apis.io/apis/fortnox/fortnox-customers-api/)
- [Fortnox Financial Years API](https://apis.io/apis/fortnox/fortnox-financial-years-api/)
- [Fortnox Invoices API](https://apis.io/apis/fortnox/fortnox-invoices-api/)
- [Fortnox Offers API](https://apis.io/apis/fortnox/fortnox-offers-api/)
- [Fortnox Orders API](https://apis.io/apis/fortnox/fortnox-orders-api/)
- [Fortnox Projects API](https://apis.io/apis/fortnox/fortnox-projects-api/)
- [Fortnox Supplier Invoices API](https://apis.io/apis/fortnox/fortnox-supplier-invoices-api/)
- [Fortnox Suppliers API](https://apis.io/apis/fortnox/fortnox-suppliers-api/)
- [Fortnox Vouchers API](https://apis.io/apis/fortnox/fortnox-vouchers-api/)

## Tags

WebSocket, Event, Change Notifications

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/fortnox/fortnox-topics-websocket-api/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/fortnox/.