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URL Notarization with EIP-712 + EAS Cryptographic Attestation
x402
URL Notarization with EIP-712 + EAS Cryptographic Attestation is a paid API for AI agents from api.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 cryptographically signed snapshot (hash, HTTP metadata, timestamp) with both an EIP-712 signature and an EAS off-chain attestation for non-repudiation.
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, SHA-256 hash of the body, server-side timestamp, and upstream host. Includes two cryptographic attestations: a plain EIP-712 signature and an EAS off-chain (Version2) attestation anchored to Base (chainId 8453). In mode=full, also returns the base64-encoded response body.
Example use cases
Example prompt
“Can you notarize https://example.com/press-release.html for me — just return the metadata and SHA-256 hash without the full body — so I have a cryptographic proof of what it contained right now, with an EIP-712 signature and EAS attestation?”
Technical details
Endpoint
GEThttps://api.agentstools.dev/notarize?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need cryptographically verifiable, non-repudiable proof of what a public URL served at a specific moment — for legal evidence, audit trails, content integrity checks, or blockchain-backed attestations. It is uniquely suited when EIP-712 signatures or EAS attestations are required, distinguishing it from simple web scrapers or screenshot services that provide no cryptographic guarantees.
Side effects
- URL is not publicly reachable — returns fetch error or timeout
- URL returns a non-2xx status — snapshot is still signed but records the error status
- Invalid or malformed URL input — returns validation error
- Upstream server blocks the notarizer's fetch (e.g. firewall, bot protection) — fetch fails
- mode parameter not recognized — falls back to default hash mode or returns parameter error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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