{"uid":"cap_ykCQC-sbRt7lSlOStoB3R","slug":"main-image-detect-watch-80604e28","name":"main-image-detect-watch","description":"Change watch for main image detect: 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 main image of a page changes. $0.01 per check.","url":"https://intel.rallylive.ca/watch/page/main-image","method":"GET","headers":{},"bodySchema":{"type":"object","$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_wu0V5CR2R9qOuEZLdhriy","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 webpage's main image for changes by comparing the current result against a stored previous result, returning a diff with changed fields and timestamps.","exampleAgentPrompt":"Keep an eye on https://example.com for me — let me know if the main image on that page ever changes compared to the last time you checked.","exampleUseCases":[{"title":"E-commerce product image monitoring","prompt":"Watch https://shop.acme.com/product/widget for me and tell me if the main product image changes — I want to know exactly what it looked like before and what it looks like after if it ever does."},{"title":"Competitor homepage hero tracking","prompt":"Monitor https://competitor.com every day and alert me whenever their homepage hero image is swapped out — I need to see the before and after so I can track their campaign changes."},{"title":"News site featured image alerting","prompt":"Check https://news-site.com for me on a schedule and let me know the moment their main article image changes, along with when it was last seen unchanged."}],"resultDescription":"Returns the current main image detected on the page, a boolean indicating whether it changed since the last call for the same URL, a field-level diff showing exactly which properties changed with before and after values, and the timestamp of when the image was last seen. Previous results are retained for 90 days.","failureModes":["URL is unreachable or returns a non-200 status — check may return an error or null image result","No previous result stored for the URL (first call) — changed flag may be false or undefined since there is no baseline to compare against","Page has no detectable main image — returns empty or null image fields","URL stored result has expired after 90 days — diff baseline is reset","Malformed or non-HTTP URL input — request fails validation"],"whenToPreferThis":"Use this endpoint when you need to detect changes in a webpage's main image over time on a polling or scheduled basis. It is ideal for monitoring competitor product pages, landing pages, news sites, or any URL where the primary visual content matters. Unlike a one-shot image extraction, this endpoint maintains a 90-day history per URL and returns a structured diff, making it the right choice when you need to know not just the current image but whether and exactly how it changed since your last check.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T07:09:38.139Z","isFirstParty":false}