---
title: "Validate API Key"
method: GET
path: "/auth/check"
tags: ["System"]
---

# Validate API Key

`GET /auth/check`

## Request

- Base URL: `https://app.lettr.com/api`
- URL: `https://app.lettr.com/api/auth/check`
- Auth: HTTP bearer

Validate the provided API key and return associated team information. Use this endpoint to verify API key validity in client libraries.

## Response `200`

API key is valid

- object
  - `message` string, required
  - `data` object, required
    - `team_id` integer, required: The team ID associated with the API key
    - `timestamp` string, date-time, required

## Other responses

- `401`: Unauthorized - Missing or invalid API key
- `503`: Service unavailable - the API key could not be verified, so the request was not processed. This does not mean the key is invalid; retry after the delay given in the Retry-After header.

---

[API](https://skmtc.dev/lettr/apis/lettr-api.md) · [All operations](https://skmtc.dev/lettr/apis/lettr-api/llms.txt) · [OpenAPI document](https://skmtc.dev/lettr/apis/lettr-api/revisions/48ef0dac1ebd?raw)