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PayAI URL Notarization & Cryptographic Attestation
x402
PayAI URL Notarization & Cryptographic Attestation is a paid API for AI agents from payai.agentstools.dev, paid per call via x402, $0.008/call, status unknown (last checked 2026-10-11).
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.
Price / call$0.008
Success—
StatusUnknown
How this service works
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.
Output
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.
Example use cases
Audit trail for regulatory compliance reports
“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.”
Verify smart contract documentation integrity
“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.”
Timestamp and verify web resource authenticity
“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?”
Technical details
Endpoint
GEThttps://payai.agentstools.dev/notarize?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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