Independent case / interactive lab
Offer observations and change review
The case separates timestamped source observations from labelled replay fixtures used to demonstrate changes and collection failures.
Price and stock monitoring lab
Browser-local rules · inspectable inputsLoading the demonstration…
Execution & evidence
What this case establishes.
Two official manufacturer storefronts were each read three times on 25 October 2026. Prices and availability were unchanged across these observations. CDN caching and checkout conditions limit what a page observation establishes. The change replay above is synthetic.
Scope and limitations
- Real captures and synthetic change or failure replays are separated.
- An unknown or failed collection is not treated as out of stock.
- Demonstrated source access does not guarantee access to every retailer.
Acceptance checks
- Compare the same configuration, seller conditions and currency.
- Preserve the source and actual capture time for each observation.
- Distinguish a genuine observed change from an unavailable collection.
Technical references
References inform the design. They do not imply a connected account or an endorsement.
A bounded first engagement
Start with one clear outcome.
Small known-match product set, source feasibility and a defined observation frequency. Include browser/API costs and source-change maintenance explicitly.