# Proof402 x402 Audit — URL Intelligence & Endpoint Diagnostics

> Proof402 x402 Audit — URL Intelligence & Endpoint Diagnostics is a paid API for AI agents from proof402.15-204-209-67.sslip.io, paid per call via x402, $0.25/call, status unknown (last checked 2026-09-14).

Inspects a public URL to assess its x402 payment protocol compatibility, returning a score, verdict, and detailed findings about payment configuration.

## Facts

- Endpoint: GET https://proof402.15-204-209-67.sslip.io/api/x402-audit
- Price: $0.25/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/proof402-x402-audit-url-intelligence-endpoint-diagnostics-b10310ce
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_LLc2qfQ-mfQTe1e8IQbJE

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 proof402-x402-audit-url-intelligence-endpoint-diagnostics-b10310ce
```

Example prompt: Can you run an x402 audit on https://myapi.example.com/paid-endpoint and tell me the compatibility score and whether it's properly configured for Base mainnet USDC payments?

## When to prefer this

Use this endpoint when you need to programmatically verify whether a specific URL correctly implements the x402 payment protocol — especially before integrating it into an agent workflow, debugging payment failures, or auditing third-party APIs for Base mainnet USDC compatibility. Prefer this over manual inspection when you need a structured score and machine-readable findings rather than a human description.

## Known failure modes

- URL is unreachable or returns a non-HTTP error — audit cannot complete
- Target URL does not implement x402 at all — verdict will reflect incompatibility
- Malformed or non-URI input causes request rejection
- Private or firewalled URLs cannot be inspected
- Service may return incomplete findings if the target times out

## How this service works

Pay-per-call page profiling and x402 endpoint diagnostics, settled in Base-mainnet USDC.

## Output

Returns a JSON object containing: the audited URL, a numeric compatibility score (0–100), the HTTP status code observed, a verdict string (e.g. 'compatible'), an array of findings each with a code and pass/fail level, and a requirements object listing accepted payment schemes, x402 version, and supported networks (e.g. eip155:8453 for Base mainnet).

## 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"
     ],
     "type": "string"
    },
    "pathParams": {
     "type": "object"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "url"
     ],
     "properties": {
      "url": {
       "type": "string",
       "format": "uri",
       "description": "A public HTTP or HTTPS URL to inspect."
      }
     },
     "additionalProperties": false
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "url": "https://example.com/api/paid",
  "score": 92,
  "status": 402,
  "verdict": "compatible",
  "findings": [
   {
    "code": "payment_required_present",
    "level": "pass"
   },
   {
    "code": "mainnet_network",
    "level": "pass"
   }
  ],
  "requirements": {
   "schemes": [
    "exact"
   ],
   "version": 2,
   "networks": [
    "eip155:8453"
   ]
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proof402-x402-audit-url-intelligence-endpoint-diagnostics-b10310ce/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from proof402.15-204-209-67.sslip.io](https://www.zero.xyz/host/proof402.15-204-209-67.sslip.io/llms.txt)