{"uid":"cap_ylmsDtcPXCX3uZ5KbAelu","slug":"x402helper-xyz-url-notarization-endpoint-cbdaae80","name":"x402helper.xyz URL Notarization Endpoint","description":"X402 micropayments server — AI agents pay USDC for OFAC screening, rates, and billing verification.","url":"https://x402helper.xyz/89e509/notarize?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","default":null,"description":"Public http(s) URL to fetch and notarize"},"mode":{"enum":["hash","full"],"type":"string","default":null,"description":"hash = metadata + sha256 only (default); full = also return the fetched body (base64)"},"network":{"type":"string","default":null,"description":"Reserved (attestations are chainId 8453 / Base)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":{"type":"json","example":{"result":{},"success":true}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.009","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":"$0.009/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.009","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm__Khh4AsdiuohMZJ5UuFiX","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.009","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Fetches a public URL and returns a cryptographic notarization (hash or full body) anchored on Base (chainId 8453) for $0.009 USDC per call.","exampleAgentPrompt":"Please notarize https://example.com/invoice-2024-06.pdf and give me the SHA-256 hash anchored on Base — just the hash metadata, not the full body.","exampleUseCases":[{"title":"Notarize a legal document URL","prompt":"Can you fetch and notarize https://contracts.mycompany.com/agreement-v3.pdf and give me the SHA-256 hash as a tamper-evident record on Base?"},{"title":"Prove webpage content at a point in time","prompt":"I need to prove that https://news.example.com/article/12345 said what it said today — can you notarize it in full mode so I also get the page body back?"},{"title":"Verify a public pricing page hasn't changed","prompt":"Notarize https://vendor.io/pricing in hash mode so I have a cryptographic record of what their pricing page said right now on Base blockchain."}],"resultDescription":"A JSON object with a success flag and a result object containing the notarization data: SHA-256 hash of the fetched URL content, metadata about the fetch (timestamp, URL, HTTP status), and optionally the full base64-encoded response body if mode=full. The attestation is anchored on Base (chainId 8453).","failureModes":["URL is unreachable or returns a non-200 status — notarization fails with an error result","Private or non-public URL passed — fetch is blocked","Payment (USDC via x402) not included or insufficient — HTTP 402 returned before processing","Invalid mode enum value — request rejected at schema validation","URL parameter missing — required field error"],"whenToPreferThis":"Use this endpoint when you need a lightweight, pay-per-use cryptographic attestation of a public URL's content anchored on Base blockchain. Prefer it over self-managed notarization when you need minimal setup, on-chain proof, and only pay $0.009 per call. Best suited for agents that need tamper-evident records of web content, document snapshots, or pricing/terms pages.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-31T18:41:37.985Z","isFirstParty":false,"canonicalSlug":"x402helper-xyz-url-notarization-endpoint-cbdaae80"}