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

# Check multiple domains availability

> Check availability for multiple domain names (max 50 domains per request). Some results may be cached.



## OpenAPI

````yaml POST /registrar/v1/domains/check-bulk
openapi: 3.0.0
info:
  title: Atom Registrar API
  version: 1.0.0
  description: >-
    REST API for domain registration, DNS management, and domain operations.
    Authentication via Bearer token in Authorization header.
servers:
  - url: https://www.atom.com/api
    description: Production server
  - url: https://dev.atom.com/api
    description: Development server
security:
  - BearerAuth: []
paths:
  /registrar/v1/domains/check-bulk:
    post:
      summary: Check multiple domains availability
      description: >-
        Check availability for multiple domain names (max 50 domains per
        request). Some results may be cached.
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/BulkDomainCheckRequest'
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BulkDomainCheckResponse'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/UnauthorizedError'
        '503':
          $ref: '#/components/responses/ServiceUnavailable'
components:
  schemas:
    BulkDomainCheckRequest:
      type: object
      required:
        - domains
      properties:
        domains:
          type: array
          items:
            type: string
          minItems: 1
          maxItems: 50
          example:
            - example.com
            - test.net
            - sample.org
    BulkDomainCheckResponse:
      type: object
      properties:
        success:
          type: boolean
          example: true
        data:
          type: object
          properties:
            total_requested:
              type: integer
              example: 3
            successfully_checked:
              type: integer
              example: 2
            errors:
              type: integer
              example: 1
            results:
              type: array
              items:
                type: object
                properties:
                  domain:
                    type: string
                    example: example.com
                  availability:
                    type: integer
                    example: 1
                  status:
                    type: string
                    example: available
                  error:
                    type: string
                    description: Error message if status is error or invalid
    ErrorResponse:
      type: object
      properties:
        success:
          type: boolean
          example: false
        error:
          type: string
          example: Bad Request
        message:
          type: string
          example: Invalid input provided
  responses:
    BadRequest:
      description: Bad request - invalid parameters
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
    UnauthorizedError:
      description: Authentication failed - invalid or revoked API token
      content:
        application/json:
          schema:
            type: object
            properties:
              success:
                type: boolean
                example: false
              error:
                type: string
                example: Unauthorized
              message:
                type: string
                example: >-
                  Invalid registrar API token or access has been revoked. Please
                  request registrar API access from your dashboard.
    ServiceUnavailable:
      description: Service temporarily unavailable
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/ErrorResponse'
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      description: >-
        Registrar API Bearer token. Obtain from dashboard at
        /dashboard/seller/api-access after requesting Registrar API access.

````