# Proof402 x402 Launch Audit

> Proof402 x402 Launch Audit is a paid API for AI agents from proof402.15-204-209-67.sslip.io, paid per call via x402, $12/call, status unknown (last checked 2026-09-14).

Audits a public URL for x402 payment-protocol compliance, returning a readiness score, prioritized fix plan, and categorized findings.

## Facts

- Endpoint: GET https://proof402.15-204-209-67.sslip.io/api/x402-launch-audit
- Price: $12/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-launch-audit-92ba389c
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_GWIDoaYGvpLGRN_uibHcl

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-launch-audit-92ba389c
```

Example prompt: Can you audit https://myapi.example.com/api/premium-data for x402 compliance and tell me the readiness score, any warnings or critical issues, and what I should fix first?

## When to prefer this

Use this endpoint when you need a structured, machine-readable x402 compliance audit for a specific URL — especially during API development, pre-launch validation, or third-party vendor evaluation. It is purpose-built for x402 diagnostics with a scored, prioritized output, making it preferable to generic HTTP inspection tools when the goal is specifically to assess x402 payment-protocol readiness for autonomous agent compatibility.

## Known failure modes

- Invalid or non-public URL returns a validation error
- URL is unreachable or times out, resulting in a failed audit response
- Non-HTTP/HTTPS schemes are rejected
- URL returns no x402-related headers, yielding a low score with many findings
- Payment settlement failure on Base mainnet blocks the call entirely

## 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 target URL's final resolved URL and HTTP status; a summary with a numeric readiness score (0–100), a readiness label (e.g. 'needs-work'), warning count, and critical issue count; a list of findings each tagged with an ID and severity; a prioritized fix plan with ordered actions; and a schema version string.

## 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": {
  "target": {
   "status": 402,
   "finalUrl": "https://example.com/api/paid"
  },
  "summary": {
   "score": 78,
   "readiness": "needs-work",
   "warningCount": 3,
   "criticalCount": 0
  },
  "findings": [
   {
    "id": "discovery.manifest",
    "severity": "warning"
   }
  ],
  "schemaVersion": "1.0",
  "prioritizedFixPlan": [
   {
    "action": "Publish a matching x402 manifest.",
    "priority": 1
   }
  ]
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/proof402-x402-launch-audit-92ba389c/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)