# URL Notarization with EIP-712 + EAS Cryptographic Attestation

> 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.

## Facts

- Endpoint: GET https://api.agentstools.dev/notarize?utm_source=zero.xyz
- Price: $0.008/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-11
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/url-notarization-with-eip-712-eas-cryptographic-attestation-f7f30d6c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GaZmJ63yl445MjM1gmQm4

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability url-notarization-with-eip-712-eas-cryptographic-attestation-f7f30d6c
```

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?

## When to prefer this

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.

## Known failure modes

- 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

## 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.

## Request schema (JSON Schema)

```json
{
 "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"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/url-notarization-with-eip-712-eas-cryptographic-attestation-f7f30d6c/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)