{"uid":"cap_JbXiFj4Lfx7IT8cGNQYmM","slug":"payai-url-notarization-cryptographic-attestation-3ce6607c","name":"PayAI URL Notarization & Cryptographic Attestation","description":"Notarize a public URL: we fetch it ourselves and return a signed snapshot (final URL, HTTP status, content-type, sha256 of the body, server timestamp, upstream host) with TWO cryptographic attestations — a plain EIP-712 signature and an EAS off-chain (Version2) attestation. Proves what this endpoint observed at fetch time (integrity + timestamp + non-repudiation). mode=hash (default) returns metadata + hash only; mode=full also returns the body.","url":"https://payai.agentstools.dev/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","HEAD","DELETE"],"type":"string"},"queryParams":{"type":"object","required":["url"],"properties":{"url":{"type":"string","description":"Public http(s) URL to fetch and notarize"},"mode":{"enum":["hash","full"],"type":"string","description":"hash = metadata + sha256 only (default); full = also return the fetched body (base64)"},"network":{"type":"string","description":"Reserved (attestations are chainId 8453 / Base)"}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.008","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":{"p10Cents":"0.8000","medianCents":"0.8000","p90Cents":"0.8000","minCents":"0.8000","maxCents":"0.8000","p95Cents":"0.8000","sampleCount":1,"varies":false,"failureChargeRate":1},"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.008/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.008","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_k-JU0t6VZnP7EUU2n_3NA","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.008","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 server-side and returns a signed snapshot with EIP-712 and EAS off-chain cryptographic attestations proving the URL's content, hash, and timestamp at fetch time.","exampleAgentPrompt":"Can you notarize the URL https://example.com/report.pdf right now — just give me the metadata and SHA-256 hash without the full body — and return a cryptographic EAS attestation proving what that URL contained at fetch time?","exampleUseCases":[{"title":"Audit trail for regulatory compliance reports","prompt":"I need you to fetch our latest quarterly compliance report from our public server and create a notarized snapshot with an EAS attestation — just the hash and metadata — so we can prove to regulators exactly what was published and when."},{"title":"Verify smart contract documentation integrity","prompt":"Can you grab the current version of our protocol documentation from our website and get me a signed cryptographic proof of its content hash? We need an EAS attestation on Base so we can link it to our smart contract deployment."},{"title":"Timestamp and verify web resource authenticity","prompt":"I want to notarize this public JSON data feed right now with a full EIP-712 signature and EAS attestation — can you fetch it and give me tamper-proof proof of exactly what it contained at this moment so we can dispute any future claims about the data changing?"}],"resultDescription":"Returns a signed snapshot including the final resolved URL, HTTP status code, content-type header, SHA-256 hash of the response body, a server-side timestamp, the upstream host, an EIP-712 signature, and an EAS off-chain (Version2) attestation. If mode=full is specified, also includes the base64-encoded response body.","failureModes":["URL is not publicly accessible or returns a non-200 status — attestation reflects the actual HTTP status observed","URL requires authentication or is behind a firewall — fetch fails, no attestation produced","Invalid or malformed URL input — request rejected with validation error","Upstream server times out — fetch fails, error returned","mode parameter not recognized — defaults to hash mode"],"whenToPreferThis":"Use this endpoint when you need cryptographic, non-repudiable proof of what a public URL contained at a specific moment in time — particularly when EIP-712 signatures or EAS off-chain attestations on Base (chainId 8453) are required. Prefer it over simple HTTP fetching when integrity verification, timestamping, or blockchain-verifiable attestations are needed for legal, compliance, audit, or trust-verification purposes.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-11T00:38:36.402Z","isFirstParty":false,"canonicalSlug":"payai-url-notarization-cryptographic-attestation-3ce6607c"}