diff --git a/server/src/schemas/catalog-openapi.ts b/server/src/schemas/catalog-openapi.ts
index 22301f80df..d41504b6a3 100644
--- a/server/src/schemas/catalog-openapi.ts
+++ b/server/src/schemas/catalog-openapi.ts
@@ -161,3 +161,89 @@ registry.registerPath({
     404: { description: 'Dispute not found', content: { 'application/json': { schema: ErrorSchema } } },
   },
 });
+
+// ── GET /api/registry/catalog (browse) ──────────────────────────
+// The read/consume side of the fact loop: resolve identifiers → sync/browse
+// the catalog locally → build lists.
+
+const CatalogBrowseEntrySchema = z.object({
+  property_rid: z.string(),
+  property_id: z.string().nullable(),
+  classification: z.string().openapi({ example: 'property' }),
+  source: z.string().openapi({ example: 'adagents_json' }),
+  status: z.string().openapi({ example: 'active' }),
+  identifiers: z.array(CatalogIdentifierSchema),
+}).openapi('CatalogBrowseEntry');
+
+const CatalogBrowseResponseSchema = z.object({
+  entries: z.array(CatalogBrowseEntrySchema),
+  total: z.number().int(),
+  next_cursor: z.string().nullable().openapi({ description: 'Opaque cursor for the next page; null when exhausted.' }),
+}).openapi('CatalogBrowseResponse');
+
+registry.registerPath({
+  method: 'get',
+  path: '/api/registry/catalog',
+  operationId: 'browseCatalog',
+  summary: 'Browse the property catalog',
+  description:
+    'Browse the property fact-graph with filters. Cursor-paginated (opaque `cursor` → `next_cursor`). Each entry carries the property\'s identifiers. `property_rid` is a non-authoritative join/match handle, never an authorization credential.',
+  tags: ['Property Catalog'],
+  request: {
+    query: z.object({
+      classification: z.string().optional().openapi({ example: 'property' }),
+      source: z.string().optional(),
+      status: z.string().optional().openapi({ example: 'active' }),
+      identifier_type: z.string().optional().openapi({ example: 'domain' }),
+      search: z.string().optional(),
+      min_resolves: z.string().optional().openapi({ description: 'Minimum lifetime resolve count (integer).' }),
+      active_since: z.string().optional().openapi({ description: 'ISO 8601 — only properties with resolve activity since this time.' }),
+      limit: z.string().optional().openapi({ description: 'Page size (integer).' }),
+      cursor: z.string().optional().openapi({ description: 'Opaque pagination cursor from a prior `next_cursor`.' }),
+    }),
+  },
+  responses: {
+    200: { description: 'Catalog page', content: { 'application/json': { schema: CatalogBrowseResponseSchema } } },
+  },
+});
+
+// ── GET /api/registry/catalog/sync (delta) ──────────────────────
+
+const CatalogSyncEntrySchema = z.object({
+  property_rid: z.string(),
+  property_id: z.string().nullable(),
+  classification: z.string(),
+  source: z.string(),
+  status: z.string(),
+  adagents_url: z.string().nullable(),
+  created_by: z.string().nullable(),
+  created_at: z.string(),
+  updated_at: z.string(),
+  source_updated_at: z.string(),
+}).openapi('CatalogSyncEntry');
+
+const CatalogSyncResponseSchema = z.object({
+  entries: z.array(CatalogSyncEntrySchema),
+  server_timestamp: z.string().openapi({ description: 'Watermark to pass as `since` on the next sync (avoids clock skew).' }),
+  next_cursor: z.string().nullable(),
+}).openapi('CatalogSyncResponse');
+
+registry.registerPath({
+  method: 'get',
+  path: '/api/registry/catalog/sync',
+  operationId: 'syncCatalog',
+  summary: 'Sync catalog changes since a watermark',
+  description:
+    'Delta sync for local mirrors: returns catalog entries created/updated since `since` (a prior `server_timestamp`), capped at 10,000 per page. Pagination is by the returned `server_timestamp` watermark, distinct from browseCatalog\'s opaque cursor.',
+  tags: ['Property Catalog'],
+  request: {
+    query: z.object({
+      since: z.string().openapi({ description: 'Watermark from a prior response `server_timestamp` (required).', example: '2026-03-27T10:00:00Z' }),
+      limit: z.string().optional().openapi({ description: 'Page size, capped at 10,000.' }),
+    }),
+  },
+  responses: {
+    200: { description: 'Catalog delta', content: { 'application/json': { schema: CatalogSyncResponseSchema } } },
+    400: { description: 'Missing required `since` parameter', content: { 'application/json': { schema: ErrorSchema } } },
+  },
+});
diff --git a/static/openapi/registry.yaml b/static/openapi/registry.yaml
index 56b3bcc5d7..83038a48f8 100644
--- a/static/openapi/registry.yaml
+++ b/static/openapi/registry.yaml
@@ -3415,6 +3415,111 @@ components:
         - status
         - created_at
       additionalProperties: {}
+    CatalogBrowseResponse:
+      type: object
+      properties:
+        entries:
+          type: array
+          items:
+            $ref: "#/components/schemas/CatalogBrowseEntry"
+        total:
+          type: integer
+        next_cursor:
+          type:
+            - string
+            - "null"
+          description: Opaque cursor for the next page; null when exhausted.
+      required:
+        - entries
+        - total
+        - next_cursor
+    CatalogBrowseEntry:
+      type: object
+      properties:
+        property_rid:
+          type: string
+        property_id:
+          type:
+            - string
+            - "null"
+        classification:
+          type: string
+          example: property
+        source:
+          type: string
+          example: adagents_json
+        status:
+          type: string
+          example: active
+        identifiers:
+          type: array
+          items:
+            $ref: "#/components/schemas/CatalogIdentifier"
+      required:
+        - property_rid
+        - property_id
+        - classification
+        - source
+        - status
+        - identifiers
+    CatalogSyncResponse:
+      type: object
+      properties:
+        entries:
+          type: array
+          items:
+            $ref: "#/components/schemas/CatalogSyncEntry"
+        server_timestamp:
+          type: string
+          description: Watermark to pass as `since` on the next sync (avoids clock skew).
+        next_cursor:
+          type:
+            - string
+            - "null"
+      required:
+        - entries
+        - server_timestamp
+        - next_cursor
+    CatalogSyncEntry:
+      type: object
+      properties:
+        property_rid:
+          type: string
+        property_id:
+          type:
+            - string
+            - "null"
+        classification:
+          type: string
+        source:
+          type: string
+        status:
+          type: string
+        adagents_url:
+          type:
+            - string
+            - "null"
+        created_by:
+          type:
+            - string
+            - "null"
+        created_at:
+          type: string
+        updated_at:
+          type: string
+        source_updated_at:
+          type: string
+      required:
+        - property_rid
+        - property_id
+        - classification
+        - source
+        - status
+        - adagents_url
+        - created_by
+        - created_at
+        - updated_at
+        - source_updated_at
     AdagentsJson:
       type: object
       properties:
@@ -10647,6 +10752,113 @@ paths:
             application/json:
               schema:
                 $ref: "#/components/schemas/Error"
+  /api/registry/catalog:
+    get:
+      operationId: browseCatalog
+      summary: Browse the property catalog
+      description: Browse the property fact-graph with filters. Cursor-paginated (opaque `cursor` → `next_cursor`). Each entry carries the property's identifiers. `property_rid` is a non-authoritative join/match handle, never an authorization credential.
+      tags:
+        - Property Catalog
+      parameters:
+        - schema:
+            type: string
+            example: property
+          required: false
+          name: classification
+          in: query
+        - schema:
+            type: string
+          required: false
+          name: source
+          in: query
+        - schema:
+            type: string
+            example: active
+          required: false
+          name: status
+          in: query
+        - schema:
+            type: string
+            example: domain
+          required: false
+          name: identifier_type
+          in: query
+        - schema:
+            type: string
+          required: false
+          name: search
+          in: query
+        - schema:
+            type: string
+            description: Minimum lifetime resolve count (integer).
+          required: false
+          description: Minimum lifetime resolve count (integer).
+          name: min_resolves
+          in: query
+        - schema:
+            type: string
+            description: ISO 8601 — only properties with resolve activity since this time.
+          required: false
+          description: ISO 8601 — only properties with resolve activity since this time.
+          name: active_since
+          in: query
+        - schema:
+            type: string
+            description: Page size (integer).
+          required: false
+          description: Page size (integer).
+          name: limit
+          in: query
+        - schema:
+            type: string
+            description: Opaque pagination cursor from a prior `next_cursor`.
+          required: false
+          description: Opaque pagination cursor from a prior `next_cursor`.
+          name: cursor
+          in: query
+      responses:
+        "200":
+          description: Catalog page
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CatalogBrowseResponse"
+  /api/registry/catalog/sync:
+    get:
+      operationId: syncCatalog
+      summary: Sync catalog changes since a watermark
+      description: "Delta sync for local mirrors: returns catalog entries created/updated since `since` (a prior `server_timestamp`), capped at 10,000 per page. Pagination is by the returned `server_timestamp` watermark, distinct from browseCatalog's opaque cursor."
+      tags:
+        - Property Catalog
+      parameters:
+        - schema:
+            type: string
+            description: Watermark from a prior response `server_timestamp` (required).
+            example: 2026-03-27T10:00:00Z
+          required: true
+          description: Watermark from a prior response `server_timestamp` (required).
+          name: since
+          in: query
+        - schema:
+            type: string
+            description: Page size, capped at 10,000.
+          required: false
+          description: Page size, capped at 10,000.
+          name: limit
+          in: query
+      responses:
+        "200":
+          description: Catalog delta
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/CatalogSyncResponse"
+        "400":
+          description: Missing required `since` parameter
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/Error"
 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`.