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Draft changelog: streaming latency and webhook auth updates #391

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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 7, 2026" description="X API v2">
### Lower streaming latency

We improved delivery latency across the X API v2 streaming endpoints that prioritize data hydration, including [Filtered Stream](/x-api/posts/filtered-stream/introduction). P99 latency is now **approximately 4-5 seconds**, down from approximately 6-7 seconds. No changes are required on your end. For the lowest-latency option, see [Powerstream](/x-api/powerstream/introduction). Learn more about [consuming streaming data](/x-api/fundamentals/consuming-streaming-data).

### OAuth 2.0 user context for webhook and subscription management

[Webhook management](/x-api/webhooks/introduction) endpoints (`GET`/`POST /2/webhooks`, `PUT`/`DELETE /2/webhooks/{webhook_id}`) now accept OAuth 2.0 user context and OAuth 1.0a user context authentication, in addition to app-only Bearer tokens. The [X Activity API](/x-api/activity/introduction) subscription endpoints `PUT`/`DELETE /2/activity/subscriptions/{subscription_id}` also accept user-context authentication. You can now manage webhooks and subscriptions with the same user-context tokens your app already uses.
</Update>

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

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