{"uid":"cap_Tcpx93a3Im7PpTUh3O1Uo","slug":"url-change-detection-website-change-monitoring-b1ba4dba","name":"URL Change Detection - Website Change Monitoring","description":"Pay-per-call x402 APIs for AI agents: OpenAI-compatible LLM chat, perp funding and arbitrage spreads, crypto prices, gas, FX, Solana SPL mint audit, token price by contract, x402 delivery-receipt verification, web search, clean page extraction, batch tools and deterministic code-security scanning. USDC on Base or Solana, no signup, no API key, from $0.0001 a call.","url":"https://scanpay-edge.alextaghiashvili.workers.dev/api/v1/urlwatch?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","$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","required":["url"],"properties":{"url":{"type":"string","format":"uri"},"state_key":{"type":"string"},"previous_hash":{"type":"string"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"ok":true,"url":"https://example.com/pricing","checks":4,"changed":true,"first_seen":false,"current_hash":"bb22…","previous_hash":"aa11…"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","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":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_P0QehEmZVmHYh8I-PN0ui","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Checks whether a public URL's readable content has changed since the last check, returning a changed flag and content hashes.","exampleAgentPrompt":"Can you check whether the content at https://example.com/pricing has changed since the last time we looked at it, and tell me if anything is different?","exampleUseCases":[{"title":"Competitor pricing page tracker","prompt":"Keep an eye on https://competitor.com/pricing and tell me if any of the content has changed since the last check — I want to know immediately if they update their prices."},{"title":"Documentation update detector","prompt":"Has the page at https://docs.somelib.io/changelog changed at all since the last time it was checked? I need to know if there's been any update to the release notes."},{"title":"Terms of service change alert","prompt":"Check if https://someservice.com/terms-of-service has been modified since we last looked — flag it if the content hash is different from the previous version."}],"resultDescription":"Returns a JSON object with: ok (boolean), the monitored URL, total check count, a changed boolean indicating if content differs from last check, a first_seen boolean for new URLs, the current content hash, and the previous content hash for comparison.","failureModes":["URL is unreachable or returns a non-200 status — ok may be false or error returned","URL has never been checked before — first_seen will be true and no previous_hash available","URL content is dynamic/JavaScript-rendered and readable text may not reflect visual changes","Rate limiting or network timeouts from the target server","Invalid URL format provided in the request"],"whenToPreferThis":"Choose this endpoint when you need lightweight, hash-based change detection for a public URL without storing or retrieving full page content. It's ideal for polling workflows where you want a fast yes/no answer on whether a page changed, rather than extracting or analyzing the full text. Prefer it over full page-extract endpoints when you only need to know IF something changed, not WHAT changed.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-11-01T06:42:53.117Z","isFirstParty":false,"canonicalSlug":"url-change-detection-website-change-monitoring-b1ba4dba"}