---
title: "Sync catalog changes since a watermark"
method: GET
path: "/api/registry/catalog/sync"
tags: ["Property Catalog"]
---

# Sync catalog changes since a watermark

`GET /api/registry/catalog/sync`

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.

## Query parameters

- `since` string, required — Watermark from a prior response `server_timestamp` (required).
- `limit` string — Page size, capped at 10,000.

## Response `200`

Catalog delta

- CatalogSyncResponse
  - `entries` CatalogSyncEntry[], required
    - `property_rid` string, required
    - `property_id` string, nullable, required
    - `classification` string, required
    - `source` string, required
    - `status` string, required
    - `adagents_url` string, nullable, required
    - `created_by` string, nullable, required
    - `created_at` string, required
    - `updated_at` string, required
    - `source_updated_at` string, required
  - `server_timestamp` string, required — Watermark to pass as `since` on the next sync (avoids clock skew).
  - `next_cursor` string, nullable, required

## Other responses

- `400` — Missing required `since` parameter

---

[API](https://skmtc.net/adcontextprotocol/apis/agenticadvertising-org-registry-api.md) · [All operations](https://skmtc.net/adcontextprotocol/apis/agenticadvertising-org-registry-api/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/adcontextprotocol/agenticadvertising-org-registry-api/revisions/9ea7fedf54c0/schema)