> For the complete documentation index, see [llms.txt](/llms.txt).
> A full single-fetch corpus is available at [llms-full.txt](/llms-full.txt).
---
title: "Cancel an experiment"
description: "Cancel an experiment and every run currently in progress under it."
method: "POST"
endpoint: "/api/v1/projects/:projectId/experiments/:id/cancel"
order: 4
group: "Manage experiments"
last_verified: 2026-07-27
---



`POST /api/v1/projects/:projectId/experiments/:id/cancel`

Cancel an experiment and every run currently in progress under it.