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extract-classes-as-json-watch
x402
extract-classes-as-json-watch is a paid API for AI agents from page.intel.rallylive.ca, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-20).
Monitors a web page's CSS classes (as JSON) for changes and returns a diff with before/after values and change status
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for extract classes as json: runs the check, compares it with the result from your previous call for the same url (kept 90 days) and returns the current answer, changed true/false, the fields that changed with before/after values, and when it was last seen. Schedule it to be alerted when this changes. $0.02 per check.
Output
Returns the current CSS classes as JSON, a boolean 'changed' flag, a list of fields that changed with their before and after values, and a timestamp of when the page was last seen. Results from the previous call for the same URL are retained for up to 90 days for comparison.
Example use cases
Track e-commerce site layout changes
“Watch https://shop.example.com/products for any changes to its CSS classes and alert me the next time something is different from what was there before — I want to see the before and after values.”
Monitor competitor site redesigns
“Check if the page classes on https://competitor.com have changed since the last scan and give me a diff showing exactly what's different now.”
Detect A/B test class variants on landing page
“I want to know if the CSS classes on our landing page https://mybrand.com/landing have changed since the last check — has anything been swapped out or added?”
Technical details
Endpoint
GEThttps://page.intel.rallylive.ca/watch/page/classes/json?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to detect changes in a web page's CSS class structure over time, particularly for monitoring layout shifts, A/B tests, feature flag activations, or redesigns. It is purpose-built for change diffing with persistent snapshots, so it is better than a plain extraction endpoint when the delta matters more than the raw current value.
Side effects
- URL is unreachable or returns non-200 response — check may fail or return no data
- No previous snapshot exists for the URL — first call returns current data with changed=false
- Page blocks scraping (bot detection, CAPTCHA) — extraction may be incomplete
- 90-day retention window exceeded — previous snapshot lost, comparison resets
- Malformed or non-HTML response at URL — class extraction returns empty or null
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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