# /v1/billing-group/{}/project-assign/{} stops working

Calls to /v1/billing-group/{id}/project-assign/{id} on Aiven API stopped working on July 17, 2026.

On July 17, 2026, the endpoint /v1/billing-group/{id}/project-assign/{id} was removed from the Aiven API. Requests made to this endpoint fail since that day.

## What to use instead

Call /v1/organization/{organization_id}/project/{project_id} instead (organization-level API).

- API: Aiven API (api.aiven.io)
- Kind: Endpoint removal
- Takes effect: July 17, 2026
- Calls after that day: fail
- Calls it hits: `/v1/billing-group/{id}/project-assign/{id}`
- Source: [Announcement](https://api.aiven.io/doc/openapi.json)
- Verified: November 6, 2026, against Aiven API's own pages
- Page: https://www.okapi.bot/providers/aiven-api/breaking-changes/v1-billing-group-project-assign-stops-working/

## Aiven API's words

> The API endpoint /v1/billing-group/{billing_group_id}/project-assign/{project} is deprecated. Use https://api.aiven.io/v1/organization/{organization_id}/project/{project_id} instead. It will be removed on 2026-07-17.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent