> For the complete documentation index, see [llms.txt](https://docs.orangebit.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.orangebit.com/changelog/v1.5.md).

# v1.5

#### Prod

* [x] **v1.5.2 — Oct 27th**

  🖥️ UI Enhancements

  * Add a “Market Depth Snapshot” modal with historical depth playback.
  * Chart: improved panning/zoom performance and tooltip precision.

***

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* [x] **v1.5.1 — Oct 16th**

  ⚙️ API Updates

  * WebSocket: added snapshot\_id and seq\_no for reliable replay & deduplication.
  * Public feed /ws/markets/{symbol}/orderbook now supports incremental diffs.

***

* [x] **v1.5.0 — Oct 12th**

  📈 Derivatives

  * Beta launch of USDT-margined perpetuals. Endpoints: /api/v1/perpetuals/\*.
  * Funding rate calculator exposed via /api/v1/perpetuals/{symbol}/funding.