# x402broker.com x402-Verifier

> x402broker.com x402-Verifier is a paid API for AI agents from x402broker.com, paid per call via x402 or MPP, $0.01/call, status unknown (last checked 2026-10-20).

Audits any remote agent, MCP, or HTTP endpoint for JSON-RPC compliance, latency SLA, OpenAPI schema validity, and HTTP 402 payment settlement headers.

## Facts

- Endpoint: GET https://x402broker.com/v1/x402-verifier?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402, MPP
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/x402broker-com-x402-verifier-413c1c77
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_W1SI32ALAZTyefhAPKTtt

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 x402broker-com-x402-verifier-413c1c77
```

Example prompt: Can you audit https://myagent.example.com/api for x402 compliance — check its JSON-RPC conformance, HTTP 402 settlement headers, OpenAPI schema, and latency SLA using a GET request?

## When to prefer this

Choose this endpoint when you need to verify that a specific agent, MCP server, or HTTP API is fully compliant with x402 payment protocol conventions, JSON-RPC spec, and OpenAPI schema standards before integrating it into an agentic workflow. Prefer it over generic HTTP testing tools when x402 settlement header validation and A2A/MCP-specific SLA checks are required.

## Known failure modes

- Target URL is unreachable or times out — audit fails with connectivity error
- Target does not respond to the specified HTTP method — method mismatch error
- Target returns no OpenAPI schema — schema validation section returns null or error
- Malformed URL input — validation error before audit begins
- Target enforces auth and blocks the audit probe — 401/403 response reported in audit output

## How this service works

Audits any remote agent or MCP URL for JSON-RPC compliance, latency SLA, OpenAPI schema, and HTTP 402 settlement headers. (Live x402 v2, IETF MPP & MCP endpoint at https://x402broker.com/v1/x402-verifier)

## Output

Returns a structured compliance audit report covering: JSON-RPC spec conformance, measured latency against SLA thresholds, OpenAPI schema validation results, and presence/correctness of HTTP 402 payment settlement headers for the target URL.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "required": [
  "url"
 ],
 "properties": {
  "url": {
   "type": "string",
   "minLength": 1,
   "description": "Target A2A, MCP, or x402 service URL to audit for protocol compliance"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "object"
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/x402broker-com-x402-verifier-413c1c77/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from x402broker.com](https://www.zero.xyz/host/x402broker.com/llms.txt)