> For the complete documentation index, see [llms.txt](https://docs.trade.mn/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.trade.mn/api-doc/signed-trade-endpoint-security.md).

# SIGNED (TRADE) Endpoint security

* `SIGNED` endpoints require an additional header `X-Signature`.
* Endpoints use `HMAC SHA256` signatures. The `HMAC SHA256 signature` is a keyed `HMAC SHA256` operation..