---
title: "Verify message accuracy."
method: POST
path: "/api/v1/projects/{projectId}/conversations/{sessionId}/messages/{promptId}/verify"
tags: ["Message"]
---

# Verify message accuracy.

`POST /api/v1/projects/{projectId}/conversations/{sessionId}/messages/{promptId}/verify`

## Request

- Base URL: `https://app.customgpt.ai`
- URL: `https://app.customgpt.ai/api/v1/projects/{projectId}/conversations/{sessionId}/messages/{promptId}/verify`
- Auth: HTTP bearer
- TypeScript: <https://skmtc.dev/poll-the-people/apis/customgpt-ai/docs/api/v1/projects/:projectId/conversations/:sessionId/messages/:promptId/verify/post.ts> (a function with typed inputs; its response is checked against the schema)

Triggers a fact-checking verification process for a message's claims. The system compares each claim against the source documents and reports which claims are supported, partially supported, or unsupported.

## Path parameters

- `projectId` integer, required
- `sessionId` string, required
- `promptId` integer, required

## Response `200`

Verification request sent successfully

- object
  - `status` 'error' | 'success': The status of the response
  - `data` object
    - `message` string

## Other responses

- `400`: Bad Argument
- `401`: API Token is either missing or invalid
- `404`: Conversation message not found
- `500`: Internal Server Error

## Changes

- **2026-11-03** `77aab4354382`: 1 info
  - endpoint added

[Operation history](https://skmtc.dev/poll-the-people/apis/customgpt-ai/changes/api/v1/projects/:projectId/conversations/:sessionId/messages/:promptId/verify/post.md)

---

[API](https://skmtc.dev/poll-the-people/apis/customgpt-ai.md) - [All operations](https://skmtc.dev/poll-the-people/apis/customgpt-ai/llms.txt) - [OpenAPI document](https://skmtc.dev/poll-the-people/apis/customgpt-ai/revisions/77aab4354382?raw)