{"uid":"cap_srSEHpjiRbfw9UHbpYbgZ","slug":"the-stall-web-change-monitor-5880f639","name":"The Stall — Web Change Monitor","description":"Returns content-change signals for any public URL: ETag, Last-Modified, Content-Length, and Content-Type via HTTP HEAD. Falls back to GET + SHA-256 of the first 32 KB when the server returns no cache markers. Store the snapshot and re-call periodically to detect changes. Useful for monitoring competitor pricing, news, regulatory filings, or any public page.","url":"https://the-stall.intuitek.ai/cap/web-change-monitor","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"required":{"type":"string"},"properties":{"type":"string"}}},"responseSchema":null,"example":{"request":{"input":{"type":"http","method":"GET","queryParams":{"url":"https://example.com"}}},"response":{"ts":"2026-06-18T06:28:37.579Z","url":"https://example.com","etag":null,"method_used":"HEAD","status_code":200,"content_hash":null,"content_type":"text/html","last_modified":"Wed, 17 Jun 2026 20:54:39 GMT","content_length":null}},"exampleRequest":{"url":"https://example.com"},"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"settled","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":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.059","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.059","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_XonN5OcZIfKZeyplWOBbv","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.059","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Polls a publicly accessible URL via HTTP GET and detects whether the page content has changed since the last check","exampleAgentPrompt":"Keep an eye on https://example.com/pricing for me — let me know if the content on that page has changed since the last time you checked it.","exampleUseCases":null,"resultDescription":"Returns an indication of whether the target URL's content has changed, along with relevant metadata about the current page state such as a content hash, diff, or snapshot that can be compared against a prior state.","failureModes":["URL is not publicly accessible — returns error or timeout","Non-HTTPS/HTTP URL provided — schema validation fails","Target server returns 4xx/5xx — cannot retrieve content to compare","URL parameter missing from queryParams — required field validation error","Network timeout reaching the target URL"],"whenToPreferThis":"Use this endpoint when you need a lightweight, pay-per-call web change detection check without setting up accounts, API keys, or a dedicated monitoring subscription. Ideal for one-off or infrequent polling of public URLs, or for integrating change detection into an agent workflow that already uses the x402/USDC payment rail on Base mainnet.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-13T06:54:21.207Z","isFirstParty":false}