Hunter Email Verifier API

openapi: 3.1.0
info:
  title: Hunter Account Email Verifier API
  description: Hunter is an email finding and verification service that helps find professional email addresses associated with a domain and verify email deliverability. The API provides domain search, email finder, email verifier, email count, account information, leads management, leads lists, campaigns, discover, enrichment, and logo retrieval capabilities.
  version: 2.0.0
  termsOfService: https://hunter.io/terms
  contact:
    name: Hunter Support
    url: https://hunter.io/contact
    email: support@hunter.io
  license:
    name: Proprietary
    url: https://hunter.io/terms
servers:
- url: https://api.hunter.io/v2
  description: Hunter API v2 Production
security:
- apiKeyQuery: []
- apiKeyHeader: []
- bearerAuth: []
tags:
- name: Email Verifier
  description: Verify the deliverability of an email address.
paths:
  /email-verifier:
    get:
      operationId: emailVerifier
      summary: Hunter Email Verifier
      description: Verifies the deliverability of a given email address.
      tags:
      - Email Verifier
      parameters:
      - name: email
        in: query
        required: true
        description: The email address to verify.
        schema:
          type: string
          format: email
        example: john@stripe.com
      responses:
        '200':
          description: Successful email verification response.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/EmailVerifierResult'
                  meta:
                    $ref: '#/components/schemas/Meta'
        '202':
          description: Verification in progress. Retry the request later.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    $ref: '#/components/schemas/EmailVerifierResult'
                  meta:
                    $ref: '#/components/schemas/Meta'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '429':
          $ref: '#/components/responses/TooManyRequests'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  responses:
    TooManyRequests:
      description: Usage limit exceeded or rate limited.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    Unauthorized:
      description: Invalid or missing API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    BadRequest:
      description: Invalid parameters or missing required fields.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  schemas:
    Source:
      type: object
      properties:
        domain:
          type: string
          description: Domain where the email was found.
          example: example_value
        uri:
          type: string
          format: uri
          description: URL of the source page.
          example: https://www.example.com
        extracted_on:
          type: string
          format: date
          description: Date the email was extracted from the source.
          example: '2026-01-15'
        last_seen_on:
          type: string
          format: date
          description: Date the email was last seen at the source.
          example: '2026-01-15'
        still_on_page:
          type: boolean
          description: Whether the email is still present on the source page.
          example: true
    Meta:
      type: object
      properties:
        params:
          type: object
          description: The parameters used in the request.
          example: example_value
    Error:
      type: object
      properties:
        errors:
          type: array
          items:
            type: object
            properties:
              id:
                type: string
                description: Error identifier code.
              code:
                type: integer
                description: HTTP status code.
              details:
                type: string
                description: Human-readable error message.
          example: []
    EmailVerifierResult:
      type: object
      properties:
        status:
          type: string
          enum:
          - valid
          - invalid
          - accept_all
          - webmail
          - disposable
          - unknown
          description: The verification status of the email address.
          example: valid
        result:
          type: string
          enum:
          - deliverable
          - undeliverable
          - risky
          description: Deprecated. The deliverability result.
          deprecated: true
          example: deliverable
        score:
          type: integer
          description: Deliverability score.
          example: 10
        email:
          type: string
          format: email
          description: The email address that was verified.
          example: user@example.com
        regexp:
          type: boolean
          description: Whether the email matches a valid format.
          example: true
        gibberish:
          type: boolean
          description: Whether the email appears to be gibberish.
          example: true
        disposable:
          type: boolean
          description: Whether the email uses a disposable provider.
          example: true
        webmail:
          type: boolean
          description: Whether the email is a webmail address.
          example: true
        mx_records:
          type: boolean
          description: Whether MX records exist for the domain.
          example: true
        smtp_server:
          type: boolean
          description: Whether an SMTP server was found.
          example: true
        smtp_check:
          type: boolean
          description: Whether the SMTP check passed.
          example: true
        accept_all:
          type: boolean
          description: Whether the mail server accepts all addresses.
          example: true
        block:
          type: boolean
          description: Whether the email is blocked.
          example: true
        sources:
          type: array
          items:
            $ref: '#/components/schemas/Source'
          example: []
  securitySchemes:
    apiKeyQuery:
      type: apiKey
      in: query
      name: api_key
      description: API key passed as a query parameter.
    apiKeyHeader:
      type: apiKey
      in: header
      name: X-API-KEY
      description: API key passed via the X-API-KEY header.
    bearerAuth:
      type: http
      scheme: bearer
      description: API key passed as a Bearer token in the Authorization header.