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Draft changelog: Sep 6 auth and streaming latency updates #386

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12 changes: 12 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,18 @@ 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 6, 2026" description="X API v2">
### User-context authentication for webhooks and X Activity API subscriptions

You can now authenticate [webhook management endpoints](/x-api/webhooks/introduction) (`GET`/`POST /2/webhooks`, `PUT`/`DELETE /2/webhooks/{webhook_id}`) with OAuth 2.0 user context, in addition to the existing app-only Bearer Token and OAuth 1.0a options.

The [X Activity API](/x-api/activity/introduction) subscription update and delete endpoints (`PUT`/`DELETE /2/activity/subscriptions/{subscription_id}`) now also accept OAuth 1.0a and OAuth 2.0 user context, in addition to app-only Bearer Tokens.

### Lower streaming latency

We reduced the P99 latency of the X API v2 [streaming endpoints](/x-api/fundamentals/consuming-streaming-data), including the [Filtered Stream](/x-api/posts/filtered-stream/introduction), from approximately 6-7 seconds to approximately **4-5 seconds**. You receive fully hydrated Posts faster, with no changes required on your side. For the lowest-latency option, see [Powerstream](/x-api/powerstream/introduction).
</Update>

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

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