{"uid":"cap_JPf4nhKlU2Kp5oOeA28QT","slug":"website-change-evidence-compare-live-d987fb84","name":"Website Change Evidence – Compare Live","description":"Read public webpages, capture citation-grade metadata and hashes, and detect live page changes deterministically.","url":"https://website-change-evidence.inboxtzdjqv.workers.dev/v1/compare-live?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","required":["url","before"],"properties":{"url":{"type":"string"},"before":{"type":"object"},"phrases":{"type":"array"}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.003","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":"$0.003/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.003","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_SS1RiTepJJiE3GqS1e_-u","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.003","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a live public webpage, computes citation-grade metadata and content hashes, and deterministically detects changes against a previously captured baseline snapshot.","exampleAgentPrompt":"Check if the Amazon product page at https://amazon.com/dp/B09XYZ has changed since this snapshot — pay attention to whether the price phrase '$29.99' is still present, and compare it against the baseline object I captured yesterday.","exampleUseCases":[{"title":"Legal evidence of webpage content","prompt":"I need citation-grade proof that this terms-of-service page at https://example.com/terms said 'no arbitration clause' as of today — fetch it live, hash it, and compare it against the baseline snapshot I saved last week so I can show whether anything changed."},{"title":"Price monitoring for e-commerce","prompt":"Check the product listing at https://shop.example.com/item/123 right now and compare it against this baseline snapshot — flag whether the phrase '$49.99' is still on the page or if the price has changed."},{"title":"Regulatory compliance page audit","prompt":"Fetch the live FDA guidance page at https://fda.gov/guidance/xyz and run it against this saved baseline to detect any content changes, especially look for whether the phrase 'effective date 2024-01-01' is still present."}],"resultDescription":"Returns a structured object indicating whether the live page differs from the baseline snapshot, including content hashes for both versions, citation-grade metadata (title, fetch timestamp, canonical URL), a list of which target phrases were found or missing, and a deterministic change flag with diff details.","failureModes":["URL is behind authentication or paywalled — returns fetch error or empty content","Target URL returns non-200 status (404, 503) — change cannot be determined","Baseline 'before' object is malformed or missing required fields — validation error","Page uses heavy JavaScript rendering that the fetcher cannot execute — returns raw HTML without rendered content","Network timeout fetching the live URL — returns timeout error","Phrases array contains regex or unsupported syntax — match fails silently or errors"],"whenToPreferThis":"Choose this endpoint when you need deterministic, citation-grade evidence of whether a specific public webpage has changed relative to a known prior state — especially for legal, compliance, or audit contexts where a cryptographic hash and metadata trail matter. Prefer it over generic scraping when you need both a live fetch AND a structured diff against a baseline in a single call, or when you need to assert the presence of specific phrases as part of the verification.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-21T00:42:40.825Z","isFirstParty":false,"canonicalSlug":"website-change-evidence-compare-live-d987fb84"}