> ## Documentation Index
> Fetch the complete documentation index at: https://docs.lettr.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Health Check

> Check the health status of the API. This endpoint does not require authentication.

Check the health status of the Lettr API. This endpoint does not require authentication and can be used for uptime monitoring or connectivity checks.

Returns the current status and an ISO 8601 timestamp.


## OpenAPI

````yaml GET /health
openapi: 3.1.0
info:
  title: Lettr API
  version: 1.0.0
  description: >-
    Lettr Email API - Send transactional emails with tracking, attachments, and
    personalization.
  contact:
    name: Lettr Support
    url: https://lettr.com
  license:
    name: Proprietary
    url: https://lettr.com/terms
servers:
  - url: https://app.lettr.com/api
    description: Production
security: []
tags:
  - name: Emails
    description: Email sending operations
  - name: Templates
    description: Email template management operations
  - name: Domains
    description: Domain management operations
  - name: Webhooks
    description: Webhook management operations
  - name: Audience
    description: 'Audience management: lists, contacts, topics, properties, and segments'
  - name: Campaigns
    description: >-
      Campaign operations: listing, stats, engagement events, and
      dispatch/scheduling
paths:
  /health:
    get:
      tags:
        - System
      summary: Health Check
      description: >-
        Check the health status of the API. This endpoint does not require
        authentication.
      operationId: healthCheck
      responses:
        '200':
          description: API is healthy
          content:
            application/json:
              schema:
                type: object
                required:
                  - message
                  - data
                properties:
                  message:
                    type: string
                    example: Health check passed.
                  data:
                    type: object
                    required:
                      - status
                      - timestamp
                    properties:
                      status:
                        type: string
                        example: ok
                      timestamp:
                        type: string
                        format: date-time
                        example: '2024-01-15T10:30:00.000Z'
              example:
                message: Health check passed.
                data:
                  status: ok
                  timestamp: '2024-01-15T10:30:00.000Z'
      security: []

````