> ## Documentation Index > Fetch the complete documentation index at: https://docs.adcontextprotocol.org/llms.txt > Use this file to discover all available pages before exploring further. # Registry change feed > Poll a cursor-based feed of registry changes. Events are ordered by UUID v7 event_id for monotonic cursor progression. The feed retains events for 90 days. The `freshness` object reports when the response was generated, the newest matching event currently visible to the feed, and the resulting feed lag. Type filtering supports glob patterns: `property.*` matches `property.created`, `property.updated`, etc. ## OpenAPI ````yaml /static/openapi/registry.yaml get /api/registry/feed openapi: 3.1.0 info: title: AgenticAdvertising.org Registry API description: >- REST API for the AgenticAdvertising.org registry. Resolve brands, discover properties, look up agents, and validate authorization in the AdCP ecosystem. Most endpoints are public and require no authentication. Endpoints marked with a lock icon accept either an organization API key or a user JWT obtained via the OAuth 2.1 flow — see [Authentication](https://agenticadvertising.org/docs/registry/index#authentication). **Base URL:** `https://agenticadvertising.org` version: 1.0.0 contact: name: AgenticAdvertising.org url: https://agenticadvertising.org servers: - url: https://agenticadvertising.org description: Production security: [] tags: - name: Onboarding description: >- Explicitly bootstrap a third-party integration into the AAO registry. Most callers don't need this tag — `POST /api/me/agents` auto-creates the org (for fresh users) and the member profile (for first-time agent registration) without a separate round trip. Use `POST /api/organizations` only when you need to override the auto-derived org name / company_type / revenue_tier. Tier transitions happen via the billing flow only; the Stripe webhook is the sole writer of `organizations.membership_tier`. - name: Member Agents description: >- Register, list, update, and remove agents on the caller's organization member profile. Authenticated programmatic surface for CI / scripts that don't want to round-trip the full member profile. - name: Brand Resolution description: Resolve advertiser domains to canonical brand identities. - name: Property Resolution description: >- Resolve publisher domains to their property configurations and authorized agents. - name: Agent Discovery description: >- Browse the federated agent network, search agent inventory profiles, publisher index, and registry statistics. - name: Change Feed description: Poll cursor-based registry change events for local sync. - name: Lookups & Authorization description: >- Look up agents by domain or property, and validate ad-serving authorization. - name: Validation Tools description: >- Validate publisher adagents.json files and generate compliant configurations. - name: Community Mirrors description: >- Publish, fetch, list, and retire catalog-only adagents.json mirrors for platforms that have not adopted AdCP. - name: Search description: Cross-entity search across brands, publishers, agents, and properties. - name: Agent Probing description: >- Connect to live agents and inspect their capabilities, formats, and inventory. - name: Brand Discovery description: Discover and crawl brand.json files across domains. - name: Agent Compliance description: Agent compliance status, storyboard test results, and compliance history. - name: Policy Registry description: >- Browse, resolve, and contribute governance policies for campaign compliance. paths: /api/registry/feed: get: tags: - Change Feed summary: Registry change feed description: >- Poll a cursor-based feed of registry changes. Events are ordered by UUID v7 event_id for monotonic cursor progression. The feed retains events for 90 days. The `freshness` object reports when the response was generated, the newest matching event currently visible to the feed, and the resulting feed lag. Type filtering supports glob patterns: `property.*` matches `property.created`, `property.updated`, etc. operationId: getRegistryFeed parameters: - schema: type: string format: uuid description: Resume after this event ID required: false description: Resume after this event ID name: cursor in: query - schema: type: string description: >- Comma-separated event type filters with glob support (e.g. property.*) example: property.*,agent.* required: false description: >- Comma-separated event type filters with glob support (e.g. property.*) name: types in: query - schema: type: integer minimum: 1 maximum: 10000 description: Max events per page (default 100, max 10,000) required: false description: Max events per page (default 100, max 10,000) name: limit in: query responses: '200': description: Feed page content: application/json: schema: type: object properties: events: type: array items: type: object properties: event_id: type: string format: uuid event_type: type: string example: property.created entity_type: type: string example: property entity_id: type: string payload: type: object additionalProperties: {} actor: type: string created_at: type: string format: date-time required: - event_id - event_type - entity_type - entity_id - payload - actor - created_at cursor: type: - string - 'null' format: uuid description: Pass as cursor in the next request to continue polling has_more: type: boolean freshness: type: object properties: generated_at: type: string format: date-time description: Server timestamp when this feed page was generated. latest_event_created_at: type: - string - 'null' format: date-time description: >- Newest event creation timestamp currently visible in the feed for the requested type filter. Null when no matching event exists inside retention. lag_seconds: type: - integer - 'null' minimum: 0 description: >- Seconds between generated_at and latest_event_created_at. Null when no matching event exists. retention_days: type: integer exclusiveMinimum: 0 description: >- Number of days the registry retains feed cursors and events. required: - generated_at - latest_event_created_at - lag_seconds - retention_days required: - events - cursor - has_more - freshness '400': description: Invalid cursor format or type filter content: application/json: schema: $ref: '#/components/schemas/Error' '401': description: Authentication required content: application/json: schema: $ref: '#/components/schemas/Error' '410': description: Cursor expired (older than 90-day retention window) content: application/json: schema: type: object properties: error: type: string enum: - cursor_expired message: type: string required: - error - message security: - bearerAuth: [] - oauth2: [] components: schemas: Error: type: object properties: error: type: string required: - error securitySchemes: bearerAuth: type: http scheme: bearer description: >- Bearer token in the `Authorization` header. Two token types are accepted: - **Organization API key** (`sk_...`) issued via the dashboard. Org-scoped, long-lived, for server-to-server use. - **User JWT** obtained via the OAuth 2.1 authorization code flow with PKCE. User-scoped, short-lived. Discover the authorization server at `/.well-known/oauth-authorization-server` and the protected-resource metadata at `/.well-known/oauth-protected-resource/api`. oauth2: type: oauth2 description: >- OAuth 2.1 authorization code flow with PKCE. Users authenticate via AuthKit and clients receive a Bearer JWT that authorizes both the MCP endpoint and this REST API. Dynamic client registration is supported at `/register`. flows: authorizationCode: authorizationUrl: https://agenticadvertising.org/authorize tokenUrl: https://agenticadvertising.org/token refreshUrl: https://agenticadvertising.org/token scopes: openid: User identifier profile: User profile information email: User email address ````