generated: '2026-07-27'
method: searched
source: live probes of the ERCOT API, developer-portal, corporate and Azure AD B2C hosts
description: >-
  ERCOT publishes no /.well-known/ discovery surface on its own hosts — api.ercot.com,
  developer.ercot.com and www.ercot.com all return 404 for security.txt, api-catalog,
  openid-configuration and oauth-authorization-server. The one real discovery document in
  the ERCOT estate is the Azure AD B2C OpenID Connect configuration for the
  B2C_1_PUBAPI-ROPC-FLOW user flow that issues the ID token every Public Data API call
  requires; it is anonymous, returns 200, and is saved here verbatim.
hosts:
- host: https://api.ercot.com
  documents:
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/openid-configuration
    status: 404
  - path: /.well-known/oauth-authorization-server
    status: 404
  - path: /openapi.json
    status: 404
    note: The OpenAPI is published in GitHub (ercot/api-specs), not served from the API host.
  - path: /swagger.json
    status: 404
- host: https://developer.ercot.com
  documents:
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /.well-known/ai-plugin.json
    status: 404
  - path: /llms.txt
    status: 404
  - path: /robots.txt
    status: 404
- host: https://www.ercot.com
  documents:
  - path: /.well-known/security.txt
    status: 404
  - path: /.well-known/api-catalog
    status: 404
  - path: /robots.txt
    status: 200
    note: Served, but carries no API discovery information.
- host: https://ercotb2c.b2clogin.com
  documents:
  - path: /ercotb2c.onmicrosoft.com/B2C_1_PUBAPI-ROPC-FLOW/v2.0/.well-known/openid-configuration
    status: 200
    file: ercot-openid-configuration.json
    note: >-
      OIDC discovery for the Public Data API user flow. issuer
      https://ercotb2c.b2clogin.com/6df17afa-1b36-499a-83f7-56779ad0b9a6/v2.0/,
      grant_types_supported [password] (ROPC), scopes_supported [openid], RS256.
security_txt: false
api_catalog: false