generated: '2026-08-30'
method: probed
source: >-
  live anonymous requests to https://sourcebook.acus.gov/api.php and
  https://sourcebook.acus.gov/rest.php/v1/* on 2026-08-30, plus
  https://sourcebook.acus.gov/api.php?action=rsd
provider: Administrative Conference of the United States
providerId: administrative-conference-of-the-united-states
description: >-
  ACUS runs one publicly callable API surface: the MediaWiki Action API and MediaWiki
  REST API v1 behind the Federal Administrative Procedure Sourcebook wiki at
  sourcebook.acus.gov. All read operations are ANONYMOUS — no API key, no token, no
  account. There are no OAuth flows: the wiki's own RSD document reports
  OAuth=false. Write actions exist in the module list but require a wiki account and a
  CSRF token, and account creation is not open to the public. The other two ACUS data
  properties (the EAJA Awards Database and the Federal Administrative Adjudication
  Database) expose no programmatic interface at all, so they have no auth model.
apis:
  - name: Federal Administrative Procedure Sourcebook API
    baseURL: https://sourcebook.acus.gov/api.php
    rest_baseURL: https://sourcebook.acus.gov/rest.php/v1
    schemes:
      - id: anonymous
        type: none
        applies_to: all read operations (action=query, action=parse, action=opensearch, REST GET)
        in: n/a
        evidence: >-
          GET https://sourcebook.acus.gov/api.php?action=query&meta=siteinfo&format=json -> 200
          with no credentials; GET https://sourcebook.acus.gov/rest.php/v1/page/Main_Page -> 200
          with no credentials.
      - id: mediawiki-session-csrf
        type: cookie+csrf-token
        applies_to: >-
          write modules (edit, upload, move, delete, protect, patrol, watch, options,
          visualeditoredit and the rest of the 54-action surface)
        in: cookie
        token_endpoint: https://sourcebook.acus.gov/api.php?action=query&meta=tokens
        evidence: >-
          MediaWiki 1.43.0 standard model, reported by action=paraminfo&modules=main. Not
          exercised — this repo issues read-only probes only.
        note: >-
          Not an agent-usable auth model. There is no self-service registration for the
          Sourcebook wiki, and action=rsd reports OAuth false, so no OAuth/OAuth2
          consumer flow is available.
      - id: oauth
        type: oauth2
        available: false
        evidence: >-
          GET https://sourcebook.acus.gov/api.php?action=rsd -> 200,
          <setting name="OAuth">false</setting>. No OAuth extension is installed
          (siprop=extensions returns only skins plus VisualEditor, WikiEditor, Cite).
access_control_findings:
  - finding: user-agent-gated
    severity: high-for-agents
    detail: >-
      Every acus.gov host returns HTTP 403 to non-browser user agents. Measured 2026-08-30
      against https://sourcebook.acus.gov/rest.php/v1/page/Main_Page: curl/8.7.1 -> 403,
      python-requests/2.31.0 -> 403, GPTBot/1.0 -> 403, desktop Chrome UA -> 200. The
      identical pattern holds for www.acus.gov and for the Action API. The API is public
      and unauthenticated, but a default-configured HTTP client or crawler cannot reach it
      without spoofing a browser User-Agent. This is an edge policy, not an auth
      requirement, and it is the single biggest barrier to agent consumption of ACUS data.
    evidence:
      - request: 'GET https://sourcebook.acus.gov/rest.php/v1/page/Main_Page (UA: curl/8.7.1)'
        status: 403
      - request: 'GET https://sourcebook.acus.gov/rest.php/v1/page/Main_Page (UA: GPTBot/1.0)'
        status: 403
      - request: 'GET https://sourcebook.acus.gov/rest.php/v1/page/Main_Page (UA: Chrome 126 desktop)'
        status: 200
well_known:
  openid_configuration: null
  oauth_authorization_server: null
  note: Both probed on www.acus.gov and returned 404 — see well-known/ artifact.
maintainers:
  - FN: Kin Lane
    X-twitter: apievangelist
    email: info@apievangelist.com