# API v5 stops working

Calls to /v5/* on Omnisend API stop working on June 30, 2027.

On June 30, 2027, the Omnisend API will shut down its v5 version. All requests to /v5/* endpoints will fail after this date. The provider has deprecated this version and scheduled it for sunset.

- API: Omnisend API (api.omnisend.com)
- Kind: Endpoint removal
- Takes effect: June 30, 2027
- Calls after that day: fail
- Calls it hits: `/v5/*`
- Source: [Announcement](https://api-docs.omnisend.com/v5/reference/overview)
- Page: https://www.okapi.bot/providers/omnisend-api/breaking-changes/api-v5-stops-working/

## What to use instead

Migrate your calls to the v2026-03-15 API. This transition requires using the base path api.omnisend.com/api/ for contacts, products, categories, batches, and events, alongside an Authorization header with your key and an Omnisend-Version header set to 2026-03-15 on every request.

## Omnisend API's words

> The v5 API is deprecated and will be sunset on June 30, 2027 .