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extract-h4-as-json-watch
x402
extract-h4-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 2026-10-23).
Monitors a web page's H4 headings for changes, returning current H4 JSON, a changed flag, before/after diffs, and last-seen timestamp
Price / call$0.02
Success—
StatusUnknown
How this service works
Change watch for extract h4 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 H4 headings extracted from the target page as a JSON array, a boolean 'changed' flag indicating whether anything differs from the previous call for that URL, a list of fields that changed with their before and after values, and a timestamp of when the page was last seen in its prior state. Results are compared against a 90-day history per URL.
Example use cases
Competitor pricing page heading monitor
“Watch https://competitor.com/pricing and tell me if any of the H4 headings change — I want to know if they rename or add pricing tiers, and what the before and after values looked like.”
News site section title tracker
“Set up a watch on https://news-site.com/topics so I get alerted when any H4 section headings change — I need to see which ones changed and what they changed from and to.”
Product page feature heading detector
“Monitor https://product.com/features for me and flag it when any H4 headings appear, disappear, or change — include the diff so I can see exactly what's different from the last check.”
Technical details
Endpoint
GEThttps://page.intel.rallylive.ca/watch/page/h4/json?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need to detect changes to H4-level headings specifically on a web page over time, rather than doing a one-shot extraction. It is ideal for scheduled polling workflows where you want to be alerted only when content changes, with structured before/after diffs. Prefer it over the plain extract-h4-as-json endpoint when change detection and historical comparison matter, not just current content retrieval.
Side effects
- Target URL is unreachable or returns a non-200 status — check may return an error or empty H4 array
- No previous result stored for the URL (first call) — 'changed' may be undefined or false with no diff
- H4 headings are dynamically injected via JavaScript and not present in static HTML — extraction may return empty
- URL history older than 90 days is purged — baseline comparison may be unavailable
- Payment failure at $0.02 USDC — call is rejected before execution
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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