find_apisBrowse and filter every API in the catalog.
get_api_artifactsOne API's artifacts, grouped by type.
get_openapiThe primary OpenAPI for this API.
find_similar_apisAPIs that look like this one.
apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
resolveTurn a domain, URL or GitHub org into the provider it belongs to.
find_cohortsEvery scored population of providers in the catalog.

All 92 tools →

Call it yourself

curl for this page

This API

curl "https://apis.io/api/v1/apis/whoisgeni-us:whoisgeni-us-mcp-api"

All apis

curl "https://apis.io/api/v1/apis?limit=25"

Discovery needs no key. Ratings and market analysis are Pro.

Get an API key

Free tier, no form to fill in. Signing in shares your email address with us — we store it to create your key and to recognise you if you sign in with another provider. See our Privacy Policy and Terms.

GitHub Google LinkedIn

A second provider on the same verified email joins the account you already have.

OpenAPI Specification

openapi: 3.2.0
info:
  title: WhoisGenius MCP API
  description: 'Domain intelligence platform with AI-powered operator attribution Responses are JSON by default; request the compact, token-efficient TOON format with the `Accept: application/toon` header.'
  version: 0.1.0
tags:
- name: MCP
paths:
  /mcp:
    post:
      tags:
      - MCP
      summary: MCP tool server (JSON-RPC 2.0)
      description: 'Streamable-HTTP MCP endpoint implementing JSON-RPC 2.0.


        Supports three MCP methods:


        * ``initialize`` — capability handshake (stateless; ignores clientInfo)

        * ``tools/list`` — enumerate available tools

        * ``tools/call`` — invoke ``analyze_domain`` or ``correlate_domains``


        Authentication is required for ``tools/call`` (valid ``X-API-Key``);

        ``initialize`` and ``tools/list`` are unauthenticated. Errors are

        returned as JSON-RPC error objects (HTTP 200) rather than raising

        HTTPException, so the envelope middleware never wraps them.


        To use with Claude::


        claude mcp add --transport http whoisgenius http://localhost:8000/mcp


        Or for the hosted API::


        claude mcp add --transport http whoisgenius https://api.whoisgeni.us/mcp'
      operationId: mcp_endpoint_mcp_post
      parameters:
      - name: X-API-Key
        in: header
        required: false
        schema:
          anyOf:
          - type: string
          - type: 'null'
          title: X-Api-Key
      responses:
        '200':
          description: JSON-RPC response
          content:
            application/json:
              schema: {}
        '422':
          description: Validation Error
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/HTTPValidationError'
        '401':
          description: Unauthorized — missing or invalid API key/JWT.
          content:
            application/json:
              schema:
                type: object
                properties:
                  data:
                    type: 'null'
                  error:
                    type: object
                    properties:
                      code:
                        type: string
                        example: UNAUTHORIZED
                      message:
                        type: string
                  meta:
                    type: 'null'
components:
  schemas:
    ValidationError:
      properties:
        loc:
          items:
            anyOf:
            - type: string
            - type: integer
          type: array
          title: Location
        msg:
          type: string
          title: Message
        type:
          type: string
          title: Error Type
        input:
          title: Input
        ctx:
          type: object
          title: Context
      type: object
      required:
      - loc
      - msg
      - type
      title: ValidationError
    HTTPValidationError:
      properties:
        detail:
          items:
            $ref: '#/components/schemas/ValidationError'
          type: array
          title: Detail
      type: object
      title: HTTPValidationError
  securitySchemes:
    HTTPBearer:
      type: http
      scheme: bearer