ContactOut Email Verifier API

openapi: 3.2.0
info:
  title: ContactOut Email Verifier API
  version: v1
  summary: 'B2B contact data: people and company enrichment, search, contact checks, email verification, campaigns and usage stats.'
  description: Welcome to ContactOut's API. Find anyone's email & phone number 10x faster with the most powerful sales and recruitment intelligence software available. (Generated from the published API reference at https://api.contactout.com; every operation carries x-source pointing at the section it was read from.)
  contact:
    name: ContactOut
    url: https://contactout.com/meeting?utm_source=api_docs
  termsOfService: https://contactout.com/terms
  x-generated-from: documentation
  x-generated-on: '2026-10-07'
  x-generator: 'api-evangelist enrichment pass: deterministic parse of the Slate API reference HTML (headings, parameter tables, example blocks); the pipeline generator generate-contract-from-docs.py was run first and its path-collapse heuristic merged the literal resources linkedin/email/domain into a {v1id} template, so its output was replaced by this parse'
servers:
- url: https://api.contactout.com
security:
- apiToken: []
tags:
- name: Email Verifier API
paths:
  /v1/email/verify:
    get:
      summary: Single
      tags:
      - Email Verifier API
      operationId: emailVerifierSingle
      description: GET https://api.contactout.com/v1/email/verify?{email=}
      x-source: https://api.contactout.com#email-verifier-http-request
      x-section: Email Verifier API Single
      parameters:
      - name: email
        in: query
        required: true
        schema:
          type: string
        description: Email Address (string, required)
      responses:
        '200':
          description: Successful response
        '400':
          $ref: '#/components/responses/BadCredentials'
        '401':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
      x-cost:
      - Consumes 1 “verifier” credit if result is either valid, invalid or accept_all
  /v1/email/verify/batch:
    post:
      summary: Bulk
      tags:
      - Email Verifier API
      operationId: emailVerifierBulk
      description: 'POST https://api.contactout.com/v1/email/verify/batch

        GET https://api.contactout.com/v1/email/verify/batch/{job_uuid}'
      x-source: https://api.contactout.com#v1-bulk-email-verifier-http-request
      x-section: Email Verifier API Bulk
      parameters: []
      responses:
        '200':
          description: Successful response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/EmailVerifierBulkResponse'
        '400':
          $ref: '#/components/responses/BadCredentials'
        '401':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/EmailVerifierBulkRequest'
      x-cost:
      - Consumes 1 “verifier” credit per email if result is either valid, invalid or accept_all
  /v1/email/verify/batch/{jobUuid}:
    get:
      summary: Bulk (status)
      tags:
      - Email Verifier API
      operationId: emailVerifierBulkGet
      description: 'POST https://api.contactout.com/v1/email/verify/batch

        GET https://api.contactout.com/v1/email/verify/batch/{job_uuid}'
      x-source: https://api.contactout.com#v1-bulk-email-verifier-http-request
      x-section: Email Verifier API Bulk
      parameters:
      - name: jobUuid
        in: path
        required: true
        schema:
          type: string
      responses:
        '200':
          description: Successful response
        '400':
          $ref: '#/components/responses/BadCredentials'
        '401':
          $ref: '#/components/responses/BadRequest'
        '403':
          $ref: '#/components/responses/Forbidden'
        '429':
          $ref: '#/components/responses/RateLimited'
      x-cost:
      - Consumes 1 “verifier” credit per email if result is either valid, invalid or accept_all
components:
  responses:
    Forbidden:
      description: 'You''re out of credits, please email your sales manager or book a meeting; or: No access to endpoint'
    RateLimited:
      description: 'Rate limit reached. Check header retry-after: <time_in_seconds> for when rate limit will reset'
      headers:
        retry-after:
          schema:
            type: integer
          description: Seconds until the rate limit resets
    BadCredentials:
      description: Bad credentials or invalid headers
    BadRequest:
      description: Bad request or invalid input
  schemas:
    EmailVerifierBulkRequest:
      type: object
      properties:
        callback_url:
          type: string
          description: A URL where the results will be posted once the bulk email verification operation is completed. (String, optional)
        emails:
          type: array
          items: {}
          description: An array of email addresses (Array, required, Max:100)
      required:
      - emails
    EmailVerifierBulkResponse:
      type: object
      properties:
        uuid:
          type: string
          description: The unique identifier associated with the email verification request. (string)
        status:
          type: string
          description: 'The status of the email verification process. "DONE": Indicates that the email verification process has been completed. (string)'
        result:
          type: object
          description: An object containing the results of the email verification process, indexed by email addresses.Below are the possible values for verification statusvalid - the email address is valid.invalid - the email address is not valid. accept_all - the email address is valid but any email address is accepted by the server.disposable - the email address comes from a disposable email service provider.unknown we failed to verify the email address. (object)
  securitySchemes:
    apiToken:
      type: apiKey
      in: header
      name: token
      description: 'ContactOut uses API keys to allow access to the API. You can request an API key by booking a meeting. ContactOut expects the API key to be included in all API requests to the server in a header that looks like the following: token : <YOUR_API_TOKEN>'
externalDocs:
  url: https://api.contactout.com
  description: ContactOut API Reference
x-rate-limits:
- 'People Search API: 60 requests per minute'
- 'Contact Checker APIs: 150 requests per minute'
- 'Other APIs: 1000 requests per minute'