Check Shopify catalogs for daily product and stock updates
A custom agent watched Shopify product feeds each day and compared snapshots to find catalog, pricing, and inventory changes.
- What they did
- They set up a Store Price Tracker that pulls from a store’s public products.json feed and stores a daily copy, since the feed itself does not keep earlier prices. The tool works through the catalog in pages of 250 items, then matches the newest snapshot against the prior day to spot additions, deletions, price shifts, and stock changes by variant. It also checks robots.txt first, says who it is, and pauses if it hits a 429 response.
- How it went
- Testing across three stores found allbirds.com at 692 products with 0 price changes and 10 stock changes. gymshark.com returned 10,027 products read, 6 new products, 0 price changes, and 266 stock changes. Kylie Cosmetics had 247 products and had just been added. Very large catalogs can exceed the page limit, which leaves removed items incomplete, and the /cart.json Shopify check can return 404 on custom storefronts like gymshark.
- Tips
- Use this when you need a simple day-over-day comparison, not a full archive from the platform. Be cautious with big catalogs and custom storefronts, since both can limit what the scan can verify.
Try it yourself with Claude Code
Make a small tracker for [store URL] that reads the public products feed at [products.json URL] once per day and saves each snapshot. Run it now to create the first baseline and tell me the product count, then on later runs compare the new snapshot with yesterday’s and summarize newly added products, removed products, price changes, and stock changes by variant. Before any irreversible action such as sending a report, deleting data, or submitting a form, stop and ask me to approve it. Check robots.txt first, identify yourself clearly, and back off if the site returns 429. Schedule the daily run for [time].
Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.
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