---
title: "Cancel Order (Combined)"
method: POST
path: "/orders/cancel"
tags: ["Trading"]
---

# Cancel Order (Combined)

`POST /orders/cancel`

Cancel one open order by either internal orderId or client-provided clientOrderId.

## Request body

- union
  - object
    - `orderId` string, uuid, required — Internal order ID. Provide exactly one of orderId or clientOrderId.
    - `clientOrderId` string — Client-provided order ID from order creation. Provide exactly one of orderId or clientOrderId.
  - object
    - `orderId` string, uuid — Internal order ID. Provide exactly one of orderId or clientOrderId.
    - `clientOrderId` string, required — Client-provided order ID from order creation. Provide exactly one of orderId or clientOrderId.

## Response `200`

Order successfully cancelled

- CancelOrderResponseDto
  - `message` string, required — Confirmation message for the cancelled order

## Other responses

- `400` — Invalid identifier input or order cannot be cancelled
- `401` — User not authenticated or not the order owner
- `404` — Order not found
- `500` — Server error during cancellation

## Changes

- **2026-06-12** `da9b369e16fd` — 2 info
  - the endpoint scheme security `HmacAuth` was added to the API
  - the endpoint scheme security `ApiKeyAuth` was removed from the API
- **2026-05-05** `372076ca832e` — 1 info
  - endpoint added

[Change history](https://skmtc.dev/limitless-labs-group/apis/limitless-exchange-api/changes/orders/cancel/post.md)

---

[API](https://skmtc.dev/limitless-labs-group/apis/limitless-exchange-api.md) · [All operations](https://skmtc.dev/limitless-labs-group/apis/limitless-exchange-api/llms.txt) · [OpenAPI document](https://skmtc-service-production.skmtc.workers.dev/v1/apis/limitless-labs-group/limitless-exchange-api/revisions/f60847044e0d/schema)