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

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

On August 3, 2026, KuCoin Futures API stopped supporting the hidden body parameter on POST /api/v1/orders* endpoints. Following this change, requests including this parameter fail. KuCoin Futures API announced that it no longer supports the hidden, iceberg, and visibleSize parameters on these calls.

## What to use instead

Stop sending hidden, iceberg, and visibleSize on futures orders for POST /api/v1/orders and its test and batch variants. Continuing to include them causes KuCoin to reject the requests with error 400413.

- API: KuCoin Futures API (api-futures.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/orders*`, `body parameter hidden`
- Source: [Announcement](https://www.kucoin.com/docs-new/change-log)
- Verified: November 6, 2026, against KuCoin Futures API's own pages
- Page: https://www.okapi.bot/providers/kucoin-futures-api/breaking-changes/hidden-on-post-api-v1-orders-stops-working/

## KuCoin Futures 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