# hidden on POST /api/v3/hf/margin/order* stops working

Calls to POST /api/v3/hf/margin/order*, body parameter hidden on KuCoin API stopped working on August 3, 2026.

On August 3, 2026, KuCoin API removed support for the body parameter hidden on POST /api/v3/hf/margin/order*. Calls using this parameter fail because the endpoint no longer supports it.

## What to use instead

Stop sending hidden, iceberg, and visibleSize on margin orders via POST /api/v3/hf/margin/order and its test variant. Otherwise, KuCoin rejects requests 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/v3/hf/margin/order*`, `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-v3-hf-margin-order-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