# hidden on POST /api/v1/hf/orders* stops working

Calls to POST /api/v1/hf/orders*, body parameter hidden on KuCoin API stopped working on August 3, 2026.

On August 3, 2026, KuCoin API removed the body parameter hidden from POST /api/v1/hf/orders*. Calls specifying this parameter now fail, as the service no longer supports the hidden, iceberg and visibleSize parameters.

## What to use instead

Stop sending hidden, iceberg and visibleSize on spot orders, including POST /api/v1/hf/orders and its sync, test and batch variants, to prevent KuCoin from rejecting them with error 400413.

- API: KuCoin API (api.kucoin.com)
- Kind: Parameter removal
- Announced: August 3, 2026
- Takes effect: August 3, 2026
- Calls after that day: fail
- Calls it hits: `POST /api/v1/hf/orders*`, `body parameter hidden`
- Source: [Announcement](https://www.kucoin.com/docs-new/change-log)
- Verified: November 6, 2026, against KuCoin API's own pages
- Page: https://www.okapi.bot/providers/kucoin-api/breaking-changes/hidden-on-post-api-v1-hf-orders-stops-working/

## KuCoin API's words

> No longer supports the hidden, iceberg and visibleSize parameters.

Okapi finds the calls this change hits in your repo and opens the pull request with the fix: https://github.com/apps/okapi-agent