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OpenAPI Specification

openapi: 3.2.0
info:
  title: emailverifier.dev Usage API
  version: 1.6.0
  description: Verify email address quality with a technical status, recommended action, and the signals behind the result. Authenticated verification consumes one project credit.
servers:
- url: https://emailverifier.dev
tags:
- name: Usage
  description: Monitor project credit usage.
paths:
  /api/v1/usage:
    get:
      tags:
      - Usage
      operationId: getApiUsage
      summary: Get API usage and remaining credits
      description: Returns lifetime completed checks and the current credit balance for the project associated with the API key. This request does not use a credit.
      security:
      - ApiKeyAuth: []
      - BearerAuth: []
      responses:
        '200':
          description: Project usage
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/UsageSummary'
          headers:
            X-RateLimit-Limit:
              description: Requests allowed in the current window.
              schema:
                type: integer
            X-RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: integer
            X-RateLimit-Reset:
              description: ISO timestamp when the current window resets.
              schema:
                type: string
                format: date-time
        '401':
          description: API key required or invalid
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ApiKeyAuthError'
        '429':
          description: Rate limit exceeded
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RateLimitExceeded'
          headers:
            X-RateLimit-Limit:
              description: Requests allowed in the current window.
              schema:
                type: integer
            X-RateLimit-Remaining:
              description: Requests remaining in the current window.
              schema:
                type: integer
            X-RateLimit-Reset:
              description: ISO timestamp when the current window resets.
              schema:
                type: string
                format: date-time
components:
  schemas:
    ApiKeyAuthError:
      type: object
      required:
      - statusCode
      - statusMessage
      properties:
        statusCode:
          type: integer
          example: 401
        statusMessage:
          type: string
          example: Invalid API key.
    RateLimitExceeded:
      type: object
      required:
      - statusCode
      - statusMessage
      - data
      properties:
        statusCode:
          type: integer
          example: 429
        statusMessage:
          type: string
          example: Rate limit exceeded.
        data:
          type: object
          required:
          - limit
          - resetAt
          properties:
            limit:
              type: integer
              example: 10
            resetAt:
              type: string
              format: date-time
    UsageSummary:
      type: object
      required:
      - project
      - credits_used
      - credits_remaining
      - last_used_at
      additionalProperties: false
      properties:
        project:
          type: string
          example: Production
        credits_used:
          type: integer
          minimum: 0
          example: 124
        credits_remaining:
          type: integer
          minimum: 0
          example: 876
        last_used_at:
          type:
          - string
          - 'null'
          format: date-time
          example: '2026-08-11T12:00:00.000Z'
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
    BearerAuth:
      type: http
      scheme: bearer