{"uid":"cap_mUyOdNh9apKpdv9MMj7Li","slug":"webwache-canonical-change-snapshot-eeca7597","name":"Webwache Canonical Change Snapshot","description":"Canonical change snapshot fetches current public evidence from the supplied target and evaluates the documented criterion. It returns the observation, threshold, verdict, exact evidence source, limitations and a mode-specific action. The check is passive: no login attempt, payload injection, exploit, purchase, form submission or load test is performed.","url":"https://webwache.halowerk.com/v1/canonical-change-snapshot?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"target":{"type":"string","maxLength":2048,"minLength":3,"description":"Public HTTP(S) URL or domain to inspect. A bare domain is normalized to HTTPS."},"context":{"type":"object","description":"Optional non-secret correlation labels returned unchanged only in the request lifecycle.","maxProperties":12,"additionalProperties":{"type":["string","number","boolean","null"]}},"baseline":{"type":["object","null"],"description":"Optional baseline returned by a previous snapshot call.","additionalProperties":true},"compare_url":{"type":"string","maxLength":2048,"minLength":3,"description":"Optional public comparison URL. Used by change and monitoring services."}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.001","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":"$0.001/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.001","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_kuwK4B_LLr66vweI-q2Z7","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.001","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a passive public snapshot of a target URL and evaluates a documented change criterion, returning an observation, verdict, evidence source, and limitations.","exampleAgentPrompt":"Take a passive snapshot of https://example.com and check whether the page content has changed compared to the baseline I stored last week — give me the observation, verdict, and the exact evidence source you used.","exampleUseCases":[{"title":"Price drop alert on product page","prompt":"Grab a snapshot of https://store.example.com/product/widget and tell me whether the listed price has dropped below $49 — I want the verdict, what you actually observed on the page, and where you found that evidence."},{"title":"Competitor homepage change detection","prompt":"Take a current snapshot of https://competitor.com and compare it against this baseline I have from last Monday — has anything meaningful changed, and what's your verdict?"},{"title":"Regulatory notice monitoring","prompt":"Check https://regulator.gov/notices right now and evaluate whether a new enforcement notice has appeared on the page — give me the observation, threshold verdict, and any limitations in your read."}],"resultDescription":"Returns a structured object containing: the observation (what was found on the page), a threshold or criterion evaluation, a verdict (pass/fail/uncertain), the exact evidence source URL, any limitations on the passive read, and a mode-specific recommended action. The baseline object can be stored and passed back on subsequent calls for comparison.","failureModes":["Target URL is unreachable or returns non-200 status — snapshot cannot be completed","Target requires authentication or is behind a paywall — passive read is blocked","Content is JavaScript-rendered and not accessible in static fetch — observation may be incomplete","Rate limiting or bot protection on target blocks the fetch","Baseline object is malformed or from an incompatible schema version — comparison fails","Target domain normalizes incorrectly from bare domain input"],"whenToPreferThis":"Choose this endpoint when you need a passive, non-intrusive point-in-time snapshot of a public webpage to evaluate a specific observable criterion — especially when you want structured verdict output (observation + threshold + evidence source) rather than raw HTML. Prefer this over general web scrapers when you need built-in change comparison via a baseline parameter and an explicit pass/fail verdict. Not appropriate when login, form submission, or dynamic interaction with the page is required.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-22T12:30:32.803Z","isFirstParty":false,"canonicalSlug":"webwache-canonical-change-snapshot-eeca7597"}