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Draft changelog: add Sep 9, 2026 API updates #411

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Draft changelog: add Sep 9, 2026 API updates #411

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28 changes: 28 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,34 @@ 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 (Enterprise)">
### Block and Unblock user endpoints

We added Enterprise-only endpoints for blocking and unblocking users:

- [`POST /2/users/{id}/blocking`](/x-api/users/block-user) blocks a target user on behalf of the authenticated user.
- [`DELETE /2/users/{source_user_id}/blocking/{target_user_id}`](/x-api/users/unblock-user) removes an existing block.

Both endpoints require user-context (OAuth 2.0) authentication with the `block.write` scope and are available on the Enterprise plan.
</Update>

<Update label="Sep 9, 2026" description="X API v2">
### Subscription events for X Activity API

Today, we added `subscriptions.subscribe` and `subscriptions.unsubscribe` events to the [X Activity API](/x-api/activity/introduction). You can now subscribe by User ID to receive real-time notifications when a user subscribes to or unsubscribes from another user.

These are private events: they require user-context (OAuth 2.0) authentication with the `follows.read` scope, and the `user_id` filter matches the user performing the action. The `direction` qualifier (`inbound` / `outbound`) is supported.
</Update>

<Update label="Sep 9, 2026" description="X API v2">
### New `broadcast.read` and `broadcast.write` OAuth 2.0 scopes

We added two new scopes for live broadcasts to the [OAuth 2.0 Authorization Code Flow with PKCE](/fundamentals/authentication/oauth-2-0/authorization-code):

- `broadcast.read` — view your live broadcasts and their chat.
- `broadcast.write` — manage your live broadcasts and send chat messages on your behalf.
</Update>

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

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