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x402 Site Audit Tool
x402
x402 Site Audit Tool is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.001/call, status unknown (last checked 2026-09-15).
Fetches and audits a website or API endpoint for x402/API buyer-readiness, returning a structured compliance and readiness report.
Price / call$0.001
Success—
StatusUnknown
How this service works
Fetch a public API origin and audit x402 discovery, OpenAPI, pricing, llms.txt, robots, sitemap, MCP metadata, health, endpoint counts, payment schemes, and buyer-readiness signals. This deterministic endpoint does not call an upstream model. GET variant for agents, crawlers, and wallets that prefer query parameters over a JSON body. Pay up to $0.001 per request with x402 USDC on Base.
Output
Returns a JSON object with an 'ok' boolean, tool name ('x402SiteAudit'), and a structured summary describing the audited site's x402/API buyer-readiness, including compliance indicators and fetch metadata.
Example use cases
Example prompt
“Can you run an x402 buyer-readiness audit on https://example.com and tell me if it's properly set up to accept x402 USDC micropayments?”
Technical details
Endpoint
GEThttps://gpt55.558686.xyz/v1/tools/x402-site-auditWhen to prefer
Use this endpoint when you need to quickly and cheaply ($0.001 USDC) audit a specific URL or API base for x402 payment protocol readiness without a subscription. Prefer this over manual inspection when you need a structured, machine-readable report on x402 compliance signals.
Side effects
- Missing required 'url' or 'base_url' query parameter returns a validation error
- Unreachable or invalid URL results in a timeout or fetch failure
- URL exceeds max_bytes limit causing truncated or failed fetch
- Timeout set below 1000ms or above 10000ms returns a parameter validation error
- Non-HTTP URL type in input causes schema rejection
Input
{
"input": {
"type": "http",
"method": "GET",
"queryParams": {
"url": "https://example.com",
"max_bytes": 65536,
"timeout_ms": 5000,
"include_optional": true
}
},
"output": {
"type": "object",
"example": {
"ok": true,
"tool": "x402-site-audit",
"fetchedAt": "2024-01-15T10:30:00Z"
}
}
}Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
{
"ok": false,
"mcp": {
"present": false,
"toolCount": 0,
"serverName": null,
"sampleTools": []
},
"url": "https://example.com",
"tool": "x402SiteAudit",
"x402": {
"payTo": null,
"hasUpto": false,
"network": null,
"openapi": null,
"present": false,
"pricing": null,
"schemes": [],
"version": null,
"hasExact": false,
"facilitator": null,
"serviceName": null,
"resourceCount": 0,
"featuredResourceCount": 0
},
"grade": "F",
"ready": false,
"score": 10,
"checks": [
{
"id": "home",
"ok": true,
"json": false,
"path": "/",
"bytes": 559,
"status": 200,
"finalUrl": "https://example.com/",
"required": true,
"contentType": "text/html"
},
{
"id": "health",
"ok": false,
"json": false,
"path": "/health",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/health",
"required": false,
"contentType": "text/html"
},
{
"id": "openapi",
"ok": false,
"json": false,
"path": "/openapi.json",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/openapi.json",
"required": true,
"contentType": "text/html"
},
{
"id": "x402",
"ok": false,
"json": false,
"path": "/.well-known/x402",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/.well-known/x402",
"required": true,
"contentType": "text/html"
},
{
"id": "x402Service",
"ok": false,
"json": false,
"path": "/.well-known/x402-service",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/.well-known/x402-service",
"required": false,
"contentType": "text/html"
},
{
"id": "pricing",
"ok": false,
"json": false,
"path": "/pricing.json",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/pricing.json",
"required": true,
"contentType": "text/html"
},
{
"id": "llms",
"ok": false,
"json": false,
"path": "/llms.txt",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/llms.txt",
"required": false,
"contentType": "text/html"
},
{
"id": "llmsFull",
"ok": false,
"json": false,
"path": "/llms-full.txt",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/llms-full.txt",
"required": false,
"contentType": "text/html"
},
{
"id": "robots",
"ok": false,
"json": false,
"path": "/robots.txt",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/robots.txt",
"required": false,
"contentType": "text/html"
},
{
"id": "sitemap",
"ok": false,
"json": false,
"path": "/sitemap.xml",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/sitemap.xml",
"required": false,
"contentType": "text/html"
},
{
"id": "serverJson",
"ok": false,
"json": false,
"path": "/server.json",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/server.json",
"required": false,
"contentType": "text/html"
},
{
"id": "mcpJson",
"ok": false,
"json": false,
"path": "/.well-known/mcp.json",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/.well-known/mcp.json",
"required": false,
"contentType": "text/html"
},
{
"id": "mcpConfig",
"ok": false,
"json": false,
"path": "/mcp/config",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/mcp/config",
"required": false,
"contentType": "text/html"
},
{
"id": "agentCard",
"ok": false,
"json": false,
"path": "/.well-known/agent-card.json",
"bytes": 559,
"error": "Not Found",
"status": 404,
"finalUrl": "https://example.com/.well-known/agent-card.json",
"required": false,
"contentType": "text/html"
}
],
"origin": "https://example.com",
"openapi": {
"title": null,
"present": false,
"version": null,
"pathCount": 0,
"operationCount": 0,
"sampleOperations": []
},
"pricing": {
"model": null,
"prices": [],
"present": false,
"hasTokenMetered": false
},
"fetchedAt": "2026-06-12T05:13:46.589Z",
"missingRequired": [
"/openapi.json",
"/.well-known/x402",
"/pricing.json"
],
"recommendations": [
"Expose /openapi.json with machine-readable paid endpoints.",
"Expose /.well-known/x402 with x402 resources, accepts, network, payTo, and pricing links.",
"Publish exact or upto x402 payment schemes in discovery metadata.",
"Publish the x402 payTo address in discovery metadata.",
"Expose /pricing.json with price, limits, and billing mode.",
"Expose llms.txt or llms-full.txt for agent-readable product instructions.",
"Expose MCP server metadata when targeting agent tool buyers."
]
}Tags
x402
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