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Proofline x402 Readiness Check
x402
Proofline x402 Readiness Check is a paid API for AI agents from proofline-audit.chrismellado.chatgpt.site, paid per call via x402, $0.05/call, status unknown (last checked 2026-10-17).
Inspects a public x402 endpoint's unpaid response to validate its x402 v2 protocol compliance and score its payment-challenge readiness
Price / call$0.05
Success—
StatusUnknown
How this service works
Evidence-backed product validation and SaaS conversion audits, including a fixed $250 validation sprint with reproducible, Linear-ready defects.
Output
Returns a JSON object containing: a 0–100 integer readiness score, a verdict enum ('ready', 'warnings', or 'broken'), a plain-English summary, a breakdown of named compliance checks (e.g. returns402, usesX402v2, challengeDecodes, hasPaymentOption, hasBazaarDiscovery, hasResourceMetadata, hasValidExactOption, paymentChallengeSchemaValid), an array of issues found, the detected product name, and a firstRepair suggestion indicating the highest-priority fix.
Example use cases
Pre-launch x402 compliance audit
“Before I ship my new paid API, can you check https://api.myservice.com/v1/data with a GET request using Proofline to make sure the x402 payment challenge is set up correctly and tell me what the readiness score is?”
Debugging a broken payment wall
“My x402 payment wall doesn't seem to be working — can you run a readiness check on https://paywall.myapp.io/content and tell me what issues it finds and what the first thing I should fix is?”
Verifying Bazaar discovery metadata
“I just updated my x402 endpoint at https://bazaar.myco.dev/api/resource — can you check if it now has valid Bazaar discovery metadata and a proper exact payment option, and tell me the verdict?”
Technical details
Endpoint
GEThttps://proofline-audit.chrismellado.chatgpt.site/api/x402/readiness-check?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402-protected API endpoint is correctly implementing the x402 v2 payment challenge protocol — especially before publishing to a marketplace like Bazaar, debugging a broken payment wall, or automating compliance checks in a CI/CD pipeline. It is purpose-built for x402 protocol validation and provides structured, actionable output (score, verdict, issues, firstRepair) rather than generic HTTP inspection.
Side effects
- Target URL is not publicly reachable — endpoint returns a network error or DNS failure
- Target URL does not return any 402 response — verdict is 'broken' with a low score
- Malformed URL input causes request validation failure
- Target endpoint requires authentication before returning 402, making inspection impossible
- x402 challenge JSON cannot be decoded — challengeDecodes check fails
- Rate limiting or firewall on the target endpoint blocks the inspection probe
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 100,
"checks": {
"returns402": true,
"usesX402v2": true,
"challengeDecodes": true,
"hasPaymentOption": true,
"hasBazaarDiscovery": true,
"hasResourceMetadata": true,
"hasValidExactOption": true,
"paymentChallengeSchemaValid": true
},
"issues": [],
"product": "Proofline x402 Readiness Check",
"summary": "The unpaid response exposes a complete x402 v2 challenge with an exact payment option and Bazaar discovery metadata.",
"verdict": "ready"
}
}Tags
x402
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