# The preview.twilio.com Sync API stops working

Calls to /Sync/* on Twilio Preview API stopped working on March 10, 2025.

On March 10, 2025, the /Sync/* endpoint on preview.twilio.com will reach end of life. Calls made to this preview endpoint after that date will fail with a 400 error.

## What to use instead

Call the Sync API at sync.twilio.com (/v1/Services/*) instead.

- API: Twilio Preview API (preview.twilio.com)
- Kind: Endpoint removal
- Announced: January 9, 2025
- Takes effect: March 10, 2025
- Calls after that day: fail
- Calls it hits: `/Sync/*`
- Source: [Announcement](https://www.twilio.com/en-us/changelog/preview-twilio-com-sync-api-endpoint-will-end-of-life-on-march-1)
- Verified: October 26, 2026, against Twilio Preview API's own pages
- Page: https://www.okapi.bot/providers/twilio-preview-api/breaking-changes/the-preview-twilio-com-sync-api-stops-working/

## Twilio Preview API's words

> Starting March 10, 2025, the preview.twilio.com/sync API endpoint will reach its end of life (EOL). After this date, any requests sent to this endpoint will result in a 400 error.

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