{"uid":"cap_R2g8o_yHfKHrlpdc08ViB","slug":"how-is-page-change-watcher-1b44b645","name":"how.is Page Change Watcher","description":"Has this page changed since your last call, and how much? The first call stores a baseline; later calls return a text diff (2% threshold).","url":"https://how.is/v1/watch/page?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"url":{"type":"string","format":"uri","description":"An http(s):// URL on the public internet"}}},"responseSchema":{"type":"json","example":{"data":{"_shape":"data with baseline, changed, change_pct, added, removed, last_change_ts."},"result":"Page-change watch for the requested subject","receipt":{"rail":"x402","tool":"page_watch","charge_usd":0.005,"settlement_tx":"0x…"}}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_3ARCjeipuT_L_od6WeaR7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Monitors a public URL for content changes, storing a baseline on first call and returning a text diff with change percentage on subsequent calls.","exampleAgentPrompt":"Check if https://example.com/pricing has changed since the last time you looked at it — tell me what was added or removed and what percentage of the page changed.","exampleUseCases":[{"title":"Competitor pricing page surveillance","prompt":"Keep an eye on https://competitor.com/pricing for me — has anything changed since the last check? Show me exactly what text was added or removed."},{"title":"Government regulation update tracking","prompt":"Has https://regulations.gov/some-rule-page been updated since we last checked it? I need to know the change percentage and what new text appeared."},{"title":"Job listing availability monitoring","prompt":"Check whether https://company.com/careers/senior-engineer is still showing the same content as before — did anything change, and if so, what was added or removed?"}],"resultDescription":"A JSON object containing: a boolean indicating whether the page changed, the percentage of content that changed, the text that was added, the text that was removed, the timestamp of the last detected change, and a receipt confirming the x402 micropayment of $0.005 USDC. On the first call, a baseline is stored and no diff is available yet.","failureModes":["URL is not publicly accessible or returns non-200 status","First call only stores baseline — no diff returned until a second call is made","URL behind authentication or bot-blocking returns empty or error content","Change percentage below 2% threshold is not reported as a change","Invalid or malformed URL returns validation error","Rate limiting or network timeouts on slow-loading pages"],"whenToPreferThis":"Choose this endpoint when you need lightweight, pay-per-call change detection on individual public URLs without setting up recurring infrastructure. It is ideal for agents that need to check whether a specific page has changed since a previous check, get a human-readable text diff with added/removed content, and receive a quantified change percentage — all in a single API call with no subscription or webhook setup required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:40:11.527Z","isFirstParty":false,"canonicalSlug":"how-is-page-change-watcher-1b44b645"}