{"uid":"cap_NXO7YSi5u8RUlGlc7zBgd","slug":"extract-h4-as-json-watch-e92a121c","name":"extract-h4-as-json-watch","description":"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. $0.02 per check.","url":"https://page.intel.rallylive.ca/watch/page/h4/json?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET"],"type":"string"},"queryParams":{"type":"object","properties":{}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.02","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.02/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.02","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_koxjIAEpvHccKPSvkeJjR","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.02","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Monitors a web page's H4 headings for changes, returning current H4 JSON, a changed flag, before/after diffs, and last-seen timestamp","exampleAgentPrompt":"Keep an eye on https://example.com and let me know whenever its H4 headings change — I want to see what changed, what the old and new values were, and when it was last the same.","exampleUseCases":[{"title":"Competitor pricing page heading monitor","prompt":"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."},{"title":"News site section title tracker","prompt":"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."},{"title":"Product page feature heading detector","prompt":"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."}],"resultDescription":"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.","failureModes":["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"],"whenToPreferThis":"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.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-23T08:16:36.887Z","isFirstParty":false,"canonicalSlug":"extract-h4-as-json-watch-e92a121c"}