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Draft changelog: Sep 9 entry for streaming and auth updates #401

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Draft changelog: Sep 9 entry for streaming and auth updates #401

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10 changes: 10 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,16 @@ 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 9, 2026" description="X API v2">
### Lower streaming latency and new authentication options

**Streaming latency improved.** Volume and filtered stream endpoints now deliver hydrated Post data with a **P99 latency of approximately 4-5 seconds**, down from the previous ~6-7 seconds. No changes are required on your side. See [consuming streaming data](/x-api/fundamentals/consuming-streaming-data) and the [Powerstream introduction](/x-api/powerstream/introduction).

**Broadcast scopes documented.** The `broadcast.read` and `broadcast.write` OAuth 2.0 scopes are now listed in the [scopes table](/fundamentals/authentication/oauth-2-0/authorization-code). Use them to authorize the [Broadcasts endpoints](/x-api/broadcasts/list-broadcasts) for viewing and managing live broadcasts and their chat.

**More authentication options for webhooks and X Activity subscriptions.** [Webhook management endpoints](/x-api/webhooks/introduction) (`GET/POST /2/webhooks`, `DELETE/PUT /2/webhooks/:webhook_id`) and [X Activity subscription endpoints](/x-api/activity/introduction) (`PUT/DELETE /2/activity/subscriptions/:subscription_id`) now accept OAuth 2.0 user context, and OAuth 1.0a user context where it was not previously supported, in addition to App-only Bearer Token.
</Update>

<Update label="Sep 1, 2026" description="X API v2">
### Media upload and Post-create size and duration limits

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