# Agent Paywire URL Protocol Verification

> Agent Paywire URL Protocol Verification is a paid API for AI agents from api.agentpaywire.com, paid per call via x402, $1/call, status unknown (last checked 2026-10-29).

Verifies whether a public HTTP/HTTPS URL correctly implements L402, x402, or MPP payment protocols and returns a pass/fail report

## Facts

- Endpoint: POST https://api.agentpaywire.com/v1/verify?utm_source=zero.xyz
- Price: $1/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/agent-paywire-url-protocol-verification-1e594d88
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_jlfIuCSCKvJU_xxi0XZbV

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 agent-paywire-url-protocol-verification-1e594d88 -d '<json body>'
```

Example prompt: Can you verify that https://api.myservice.com/v1/search correctly implements the x402 protocol and give me a pass/fail report?

## When to prefer this

Use this endpoint when you need a paid, authoritative, third-party verification report confirming whether a specific URL correctly implements L402, x402, or MPP payment protocols — especially before listing an API in a directory, auditing a vendor, or validating your own deployment. Prefer this over the free probe endpoint when you need a persistent, referenceable report ID and official pass/fail status rather than a quick ad-hoc check.

## Known failure modes

- URL is unreachable or returns non-2xx — verification likely fails with status 'failed'
- URL does not expose any supported protocol header — returns status 'failed' with protocol null or undetected
- Invalid or malformed URL input — returns 400-level error
- Payment not processed — request rejected before verification runs
- Rate limiting or prepaid call exhaustion — request rejected with payment-required error
- protocol enum value not matching any detected protocol — may return failed status even if another protocol is present

## How this service works

Verify a public http or https provider URL for L402, x402, or MPP. POST JSON with required url and optional protocol (l402, x402, or mpp), library_id, and contact. Returns a report id and passed or failed. One verification is 1.00 USDC. Payment does not affect library inclusion or ranking.

## Output

A JSON object containing a unique report ID (UUID), the verified URL, a status of 'passed' or 'failed', the detected protocol (l402, x402, or mpp), a link to the full report at api.agentpaywire.com, and a paid_verification boolean confirming the check was paid.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "url": {
   "type": "string",
   "description": "Public http or https URL to verify. Required."
  },
  "contact": {
   "type": "string",
   "description": "Optional. At most 200 characters."
  },
  "protocol": {
   "enum": [
    "l402",
    "x402",
    "mpp"
   ],
   "type": "string",
   "description": "Optional. l402, x402, or mpp. Omit to report every protocol the probe finds."
  },
  "library_id": {
   "type": "string",
   "description": "Optional. 1 to 80 lowercase letters, digits, or hyphens."
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "id": "00000000-0000-4000-8000-000000000001",
  "url": "https://api.example.com/v1/search",
  "status": "passed",
  "protocol": "x402",
  "report_url": "https://api.agentpaywire.com/v1/verify/00000000-0000-4000-8000-000000000001",
  "paid_verification": true
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/agent-paywire-url-protocol-verification-1e594d88/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentpaywire.com](https://www.zero.xyz/host/api.agentpaywire.com/llms.txt)