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x402 Endpoint Audit & Readiness Checker
x402
x402 Endpoint Audit & Readiness Checker is a paid API for AI agents from agents.crowdspark.me, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-31).
Audits any x402-enabled API endpoint URL for payment readiness, listing presence, and discoverability, returning a 0-100 score, verdict, and prioritized fix list.
Price / call$0.01
Success—
StatusUnknown
How this service works
Will my paid API get listed? Audits any x402 endpoint URL: runs the readiness check, flags the 500 character description limit, then checks the Coinbase Bazaar listing, OpenAPI x-payment-info, 402 Index entry, favicon, llms.txt and /.well-known/x402. Returns a 0-100 score, verdict and an ordered fix list. Never sends a payment.
Output
A JSON object containing: a 0-100 overall score, a verdict string (e.g. 'ready_but_hard_to_find'), a readiness sub-score with payment price and description length, a listing sub-score including Coinbase Bazaar and OpenAPI x-payment-info status, and an ordered array of fix objects each with a severity, code, and actionable description of what to address.
Example use cases
Pre-launch x402 readiness check
“I'm about to launch my paid API at https://api.myservice.com/v1/weather — can you run the x402 audit on it and tell me what score it gets and what I need to fix before going live?”
Diagnose missing Bazaar listing
“My API at https://data.myapp.com/v1/reports is set up for x402 payments but it's not showing up on Coinbase Bazaar — can you audit it and tell me exactly what's blocking it from being listed?”
Post-fix verification
“I just added llms.txt and a favicon to my x402 API at https://tools.myplatform.com/v1/lookup — can you re-run the audit to see if my score improved and what issues are still outstanding?”
Technical details
Endpoint
GEThttps://agents.crowdspark.me/v1/x402/audit?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need a comprehensive, structured audit of an x402-enabled API endpoint rather than manually checking individual signals. It combines readiness, discoverability, and listing checks into a single scored report, making it ideal for API developers preparing to monetize their endpoints or troubleshooting why an existing paid API isn't being discovered by agents or listed on Coinbase Bazaar.
Side effects
- URL is unreachable or returns a non-HTTP response — audit cannot proceed
- Target endpoint does not return a 402 status — readiness check may score zero
- Description exceeds 500 characters — flagged as a specific fix item
- Coinbase Bazaar API unavailable — listing check may return inconclusive
- Malformed or missing queryParams.url — request rejected with validation error
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"url": "https://api.example.com/v1/data",
"fixes": [
{
"fix": "Make one paid call through the Coinbase facilitator...",
"code": "not_in_bazaar",
"severity": "warn"
}
],
"score": 82,
"listing": {
"score": 35,
"openapi": {
"found": true,
"path_documented": true
},
"coinbase_bazaar": {
"listed": false
}
},
"verdict": "ready_but_hard_to_find",
"fix_count": 1,
"readiness": {
"score": 100,
"verdict": "ready",
"price_usd": 0.001,
"description_length": 180
}
}
}Tags
x402
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