{"uid":"cap_0KtztMlMdhrt4gukZF8j1","slug":"canonical-check-watch-4121d69d","name":"canonical-check-watch","description":"Change watch for canonical check: runs the check and compares it with the result from your previous call for the same url (kept 90 days), returning the current answer, changed true/false, exactly which fields changed with before/after values, and when it was last seen. Call it on a schedule to be told when canonical url check changes. $0.01 per check.","url":"https://intel.rallylive.ca/watch/site/canonical","method":"GET","headers":{},"bodySchema":{"type":"object","$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_c9stYRW25Yrqe8YoD2BLH","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 URL's canonical tag and alerts when it changes, storing previous results for 90 days for diff comparison.","exampleAgentPrompt":"Keep an eye on the canonical tag for https://example.com/blog — check it on a schedule and let me know if anything changes from what you saw last time.","exampleUseCases":[{"title":"SEO canonical drift alert","prompt":"Watch https://shop.mysite.com/products/widget for canonical tag changes — I want to know immediately if the canonical URL shifts away from the expected value, including what it was before and what it changed to."},{"title":"Post-deploy canonical regression check","prompt":"After each deployment, check whether the canonical tag on https://myapp.com/landing has changed from what it was before — flag it if any fields are different and show me the before and after values."},{"title":"Scheduled SEO audit monitoring","prompt":"Set up a recurring watch on https://blog.example.com/top-post so I get alerted whenever the canonical URL changes, and tell me exactly which fields changed and when it was last seen in its previous state."}],"resultDescription":"Returns the current canonical URL check result, a boolean indicating whether anything changed since the previous call, a detailed diff showing exactly which fields changed with their before and after values, and a timestamp of when the result was last seen. Previous results are retained for 90 days.","failureModes":["No previous result stored (first call returns current result with changed=false or no diff)","URL is unreachable or returns non-200 status","Previous result expired after 90-day retention window","Invalid or missing URL input parameter","Rate limiting or payment failure at $0.02 per call"],"whenToPreferThis":"Use this endpoint when you need to detect changes to a page's canonical tag over time on a scheduled basis, especially for SEO monitoring workflows. It is ideal when you want a built-in before/after diff without managing your own state, and when the 90-day result retention window covers your polling frequency. Prefer this over a plain canonical check when change detection and field-level diffing are the primary goal.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:09:53.169Z","isFirstParty":false}