# AgentProof Verify URL

> AgentProof Verify URL is a paid API for AI agents from agentproof.hatchable.site, paid per call via x402, $0.1/call, status unknown (last checked 2026-10-12).

Fetches and cryptographically verifies a URL's content, returning a provenance receipt with integrity hash for autonomous transaction auditing.

## Facts

- Endpoint: POST https://agentproof.hatchable.site/api/paid/verify_url?utm_source=zero.xyz
- Price: $0.1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-12
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agentproof-verify-url-75dcb46d
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_WMtEZqgduXRw3hfRAOElb

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 agentproof-verify-url-75dcb46d -d '<json body>'
```

Example prompt: Can you verify the content at https://example.com/terms-of-service and give me a cryptographic provenance receipt with an integrity hash so I have tamper-evident proof of what it said right now?

## When to prefer this

Choose this endpoint when an AI agent needs a cryptographic, machine-paid provenance receipt proving what a URL contained at a specific moment — particularly for auditing autonomous transactions, creating tamper-evident evidence before acting on web content, or establishing baselines for change detection. Prefer it over simple HTTP fetches when verifiability and integrity attestation matter.

## Known failure modes

- URL is unreachable or returns non-200 status — ok may be false or error returned
- URL content changes between calls so hashes differ across invocations
- Payment of 0.1 USDC not completed — 402 Payment Required returned
- Malformed or missing URL input — validation error
- URL behind authentication or CAPTCHA walls — fetch may fail or return gated content

## How this service works

AgentProof publishes Agent Transaction Passport™ and provides machine-paid evidence, provenance receipts, source comparison and change monitoring for autonomous transactions.

## Output

Returns a JSON object with ok (boolean), the tool name ('verify_url'), a receipt object containing a UUID and SHA-256 integrity hash of the fetched URL's content, and the service name 'AgentProof'. This constitutes a machine-readable provenance attestation.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "format": "uri"
  },
  "claim": {
   "type": "string"
  },
  "email": {
   "type": "string"
  },
  "phone": {
   "type": "string"
  },
  "contactName": {
   "type": "string"
  },
  "previousSha256": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "tool": "verify_url",
  "receipt": {
   "id": "uuid",
   "integrity_sha256": "..."
  },
  "service": "AgentProof"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agentproof-verify-url-75dcb46d/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from agentproof.hatchable.site](https://www.zero.xyz/host/agentproof.hatchable.site/llms.txt)