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Draft changelog: Aug 29 X Activity API and usage updates #356

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Draft changelog: Aug 29 X Activity API and usage updates #356

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13 changes: 13 additions & 0 deletions changelog.mdx
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Expand Up @@ -7,6 +7,19 @@ 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="Aug 29, 2026" description="X API v2">
### New features

- **Broadcast lifecycle events in the X Activity API.** We added `broadcast.start` and `broadcast.end` events to the [X Activity API](/x-api/activity/introduction). Subscribe by User ID to be notified in real time when a user starts or ends a live broadcast. Both are public events, so you can subscribe with either app-only or user-context authentication.
- **Filter qualifiers for X Activity API subscriptions.** Subscriptions now accept an optional `filter.qualifiers` map (up to 8 entries) to narrow which events match: `conversation_type` (`direct`, `group`) on `chat.received`, and `direction` (`inbound`, `outbound`) on `follow.follow`, `follow.unfollow`, and `like.create`. Unsupported keys or values return a 400 error. See [Filter qualifiers](/x-api/activity/introduction#filter-qualifiers).
- **Credit balance endpoint.** The new [`GET /2/usage/credits`](/x-api/usage/get-usage-credits) endpoint returns your Pay-Per-Use credit balance in USD, so you can monitor remaining credits programmatically.

### Updates

- **Pay-per-use Post cap raised to 3 million.** The monthly Post read cap on pay-per-use plans increased from 2 million to 3 million. See [Post cap](/x-api/fundamentals/post-cap).
- **`is_subscriber` on `broadcast.chat` events.** The `broadcast.chat` event payload in the X Activity API now includes an `is_subscriber` boolean. See [Event payloads](/x-api/activity/event-payloads).
</Update>

<Update label="Aug 13, 2026" description="X Ads API">
### Updated `video_total_views` definition

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