Announcement of API Upgrade: 500-Level Depth Feed & API Rate Limit

06/08/2026, 12:19:00

To improve the API trading experience while optimizing market data delivery and API resource management, KuCoin will introduce two major updates to the UTA API:

Order Book 500-level Depth Websocket Push Optimization
API Rate Limit Rules Update

Order Book Depth Optimization

[Modify] UTA API Orderbook Websocket

A new incremental depth streaming mode depth=increment@10ms is introduced (supported for both Spot and Futures).

Compared with the existing depth=increment streaming mode, the new depth streams provide the following improvements:

Streaming mode

Changed from incremental updates to a “snapshot + incremental updates” model.

Depth levels

Depth coverage is adjusted from full order book to 500 levels.

Update frequency

Updates are aggregated and pushed every 10ms instead of real-time pushing.

Depth update logic

For price levels outside the top 500 depth, changes in size will not be pushed.
For price levels within the top 500 depth:

If a price level size becomes 0 due to trades, a message with size = 0 will be pushed for that price.
If a price level is pushed out of the top 500 depth due to order book changes, a message with size = 0 will be pushed for that price.

Migration Instructions

The new depth mode depth=increment@10ms will be officially launched at 08:00 on June 17, 2026 (UTC).
The current UTA API full real-time incremental depth feed depth=increment is expected to be deprecated on 15th July 2026 (UTC). A separate announcement will be issued prior to the deprecation with the exact timing. Please pay attention to updates.
Users are advised to begin migration from June 17, 2026 (UTC).
When subscribing to channel obu, set the parameter depth to increment@10ms, while keeping all other parameters unchanged.

API Rate Limit Rules Update

This update introduces APIs related to the previously announced UTA API Rate Limit Upgrade, enabling users to manage master and sub-account rate limits more conveniently.