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Draft changelog: Sep 24, 2026 weekly update #455

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Draft changelog: Sep 24, 2026 weekly update #455

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17 changes: 17 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,23 @@ keywords: ["changelog", "API updates", "release notes", "what's new", "API chang

To subscribe to updates, please [**“Turn on notifications”**](https://help.x.com/en/managing-your-account/notifications-on-mobile-devices#:~:text=In%20the%20top%20menu,%20you,you%20would%20like%20to%20receive) for [**@API**](https://x.com/api). You can also follow this changelog in your feed reader via the [**RSS feed**](https://docs.x.com/changelog/rss.xml).

<Update label="Sep 24, 2026" description="X API v2">
### New features

- **OAuth 2.0 webhook signatures.** Webhook POSTs now carry an `X-Twitter-Webhooks-Signature-OAuth2` header signed with your app's OAuth 2.0 client secret. You can also compute CRC responses with the client secret. The legacy `X-Twitter-Webhooks-Signature` header and OAuth 1.0 consumer secret keep working. See [Webhook security](/x-api/webhooks/introduction#signature-headers) and the [webhooks quickstart](/x-api/webhooks/quickstart).
- **Expiring X Activity API subscriptions.** Pass an optional `expires_at` timestamp when you create a subscription, and X deletes it automatically at that time. To change the expiration, send the same subscription again with a new `expires_at`. See [Subscription expiration](/x-api/activity/introduction#subscription-expiration).

### Updates

- **Moderator flag on broadcast chat events.** `broadcast.chat` payloads now include an `is_moderator` boolean. See [event payloads](/x-api/activity/event-payloads).
- **Broadcast scopes in token exchange.** [OAuth 1.0a to OAuth 2.0 token exchange](/fundamentals/authentication/oauth-2-0/oauth-1-0a-token-exchange) now grants `broadcast.read` for Read apps and `broadcast.read` plus `broadcast.write` for Read and write apps.
- **Livestream API access.** Livestream API endpoints are now available by allowlist. To request access, fill out the [contact form](/forms/enterprise-api-interest). See the [Livestream API](/livestream-api/introduction).

### Bug fixes

- **Removed `source` from `tweet.fields`.** The OpenAPI spec no longer lists the deprecated `source` field, which X API v2 does not return. Field pickers in tools such as Postman no longer offer it. See [Post lookup fields](/x-api/posts/lookup/integrate).
</Update>

<Update label="Sep 21, 2026" description="X API v2">
### Migrate OAuth 1.0a user tokens to OAuth 2.0 with token exchange

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