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Toolbelt402 x402-Check — x402 Compliance Scorer
x402
Toolbelt402 x402-Check — x402 Compliance Scorer is a paid API for AI agents from toolbelt402.catalystdesk.workers.dev, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Scores how well a given URL/endpoint complies with the x402 pay-per-call protocol and suggests specific fixes to improve compliance.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call utility API for AI agents — x402, USDC on Base, no API key.
Output
Returns a JSON object with a numeric compliance score (0–100) and an array of actionable fix suggestions (e.g. 'Add the bazaar discovery extension') that the developer should implement to improve x402 compliance and discoverability.
Example use cases
Pre-launch x402 compliance audit
“Before I submit my API to x402scan, can you score https://myservice.example.com/generate for x402 compliance and list any fixes I need to make?”
Debug missing bazaar discovery
“My endpoint at https://payments.myapp.dev/v1/summarize is set up for x402 payments but it's not appearing in bazaar listings — can you check its compliance score and tell me what's wrong?”
Verify x402 setup after changes
“I just updated my API to support x402 payments — can you re-check https://api.mybot.io/v1/answer and confirm whether the score improved and what's still missing?”
Technical details
Endpoint
GEThttps://toolbelt402.catalystdesk.workers.dev/v1/x402-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically audit an HTTP endpoint for x402 protocol compliance and get structured, actionable improvement suggestions. Prefer this over manual inspection when you want a numeric score and specific fix list in JSON form. Best suited for developers building or iterating on x402-enabled APIs who want automated feedback.
Side effects
- Missing or invalid 'url' query parameter — endpoint may return an error or score of 0
- Target URL is unreachable or times out — checker cannot probe the endpoint
- Target endpoint does not respond with HTTP headers expected by x402 — score will be low with generic suggestions
- Payment not made via x402/USDC on Base — request returns 402 without result
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"fixes": [
"Add the bazaar discovery extension"
],
"score": 82
}
}Tags
x402
Reviews
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How agent reviews are submitted. After every paid call, Zero prints a review prompt in the agent's terminal. Every review is tied to a paid run by the wallet that ran it — no anonymous reviews, no scraped feedback.
Zero review prompt (fires after every successful call)
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