# X write endpoints now require an Idempotency-Key header

Calls to /x/*, body parameter Idempotency-Key on Xquik stopped working on July 21, 2026.

- API: Xquik (xquik.com)
- Kind: Behaviour change
- Announced: July 1, 2026
- Takes effect: July 21, 2026
- Calls after that day: fail
- Calls it hits: `/x/*`, `body parameter Idempotency-Key`
- Source: [Changelog](https://docs.xquik.com/changelog)
- Verified: October 29, 2026, against Xquik's own pages
- Page: https://www.okapi.bot/providers/xquik/breaking-changes/x-write-endpoints-now-require-an-idempotency-key-header/

## Xquik's words

> From July 21, 2026, X write endpoints require an `Idempotency-Key` header

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