generated: '2026-07-22'
method: searched
source: live probes of polygon.io, api.polygon.io, massive.com, api.massive.com, mcp.massive.com, auth.massive.com
notes: >-
  Polygon.io rebranded to Massive in early 2026; polygon.io hosts redirect to massive.com.
  The ai-plugin.json manifest is served on both polygon.io and massive.com and points at
  https://massive.com/chatgpt/openapi.json. The OAuth protected-resource and OIDC discovery
  documents belong to the remote MCP server surface (mcp.massive.com / auth.massive.com).
hosts:
  - host: https://polygon.io
    documents:
      - path: /.well-known/ai-plugin.json
        status: 200
        file: polygon-ai-plugin.json
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/openid-configuration
        status: 404
  - host: https://api.polygon.io
    documents:
      - path: /.well-known/security.txt
        status: 404
      - path: /.well-known/oauth-authorization-server
        status: 404
      - path: /.well-known/api-catalog
        status: 404
      - path: /openapi
        status: 200
        file: ../openapi/polygon-openapi-original.json
        note: Official OpenAPI 3.0.3, 146 operations, served on the API host root
  - host: https://massive.com
    documents:
      - path: /.well-known/ai-plugin.json
        status: 200
        file: polygon-ai-plugin.json
      - path: /.well-known/security.txt
        status: 404
      - path: /llms.txt
        status: 200
        file: ../llms/polygon-llms.txt
  - host: https://api.massive.com
    documents:
      - path: /.well-known/security.txt
        status: 404
      - path: /openapi
        status: 200
        note: Same official OpenAPI as api.polygon.io/openapi
  - host: https://mcp.massive.com
    documents:
      - path: /.well-known/oauth-protected-resource
        status: 200
        file: polygon-oauth-protected-resource.json
      - path: /.well-known/oauth-authorization-server
        status: 404
  - host: https://auth.massive.com
    documents:
      - path: /.well-known/openid-configuration
        status: 200
        file: polygon-openid-configuration.json
      - path: /.well-known/oauth-authorization-server
        status: 404