{"uid":"cap_jk2QL-DW5dufnkZ92kh7v","slug":"page-change-detection-27d4f29f","name":"Page Change Detection","description":"Page change detection - website change monitoring, detect webpage changes, url change detection. Fetches a public URL and reports whether the page changed: the sha256 fingerprint of the text a reader sees, the HTTP status, ETag, Last-Modified and content type, and -- when you send the previous fingerprint as prior_hash -- a changed true or false verdict, the percent changed and the added and removed lines. GET ?url= OR ?prior_hash= OR ?sample=1|2|3 OR POST application/json with...","url":"https://6xrkjcfa3yrzvefcpvanurzou4.srv.us/api/page-change?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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object"}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_ljPbl897pIxBW633AL126","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a public URL and reports whether the page has changed since last check, including a SHA-256 content fingerprint, HTTP metadata, and diff statistics","exampleAgentPrompt":"Check if https://example.com/pricing has changed since my last snapshot — I have the previous fingerprint hash 'abc123def456' and want to know if anything changed, how much, and what lines were added or removed.","exampleUseCases":[{"title":"Price page change alert","prompt":"Keep an eye on https://competitor.com/pricing for me — here's the fingerprint from yesterday: 'e3b0c44298fc1c149afb'. Tell me if anything changed, what percentage of the page is different, and what lines were added or removed."},{"title":"News article update tracking","prompt":"Check whether https://reuters.com/article/xyz has been updated since I last saw it — my previous hash was 'a665a45920422f9d417e'. Did the content change, and if so by how much?"},{"title":"First-time page snapshot","prompt":"Fetch https://docs.stripe.com/api/charges and give me a SHA-256 fingerprint of what's on the page right now so I can track future changes to it."}],"resultDescription":"Returns a SHA-256 fingerprint of the visible text content, the HTTP status code, ETag, Last-Modified header, and content type. When a prior_hash is provided, also returns a boolean 'changed' verdict, the percentage of content that changed, and the specific lines added and removed.","failureModes":["URL is not publicly accessible or returns a non-200 HTTP status — reports the error status","URL is paywalled or bot-protected — may return incomplete or blocked content fingerprint","Malformed or invalid URL input — returns a validation error","Network timeout fetching the target URL — returns a timeout error","Prior hash format is invalid — may return a comparison error or treat as first fetch"],"whenToPreferThis":"Choose this endpoint when you need lightweight, recurring checks on whether a specific public URL has changed content, especially when you already have a prior fingerprint to compare against. It is ideal for monitoring landing pages, documentation, pricing pages, or news articles without storing full page snapshots. Prefer it over full-page scrapers when you only need change detection signals (diff percentage, added/removed lines) rather than structured extraction of the new content.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:41:15.986Z","isFirstParty":false,"canonicalSlug":"page-change-detection-27d4f29f"}