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PayerProof Trust Score API
x402
PayerProof Trust Score API is a paid API for AI agents from payerproof-production.up.railway.app, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-30).
Computes a 0-100 trust score for an x402 service listed in the Bazaar, combining liveness, on-chain payer diversity, revenue verification, and listing age into a graded report with flags.
Price / call$0.02
Success—
StatusUnknown
How this service works
Trust score (0-100) for an x402 service listed in the Bazaar: liveness probe, on-chain payer diversity, reported-vs-verified revenue (detects inflated counters and self-dealing), and listing age. Returns full component breakdown and flags.
Output
A JSON object containing a numeric trust score (0-100), a letter grade (e.g. A, B, C), a list of warning flags (e.g. concentrated_payers, inflated_revenue, self_dealing), and a full component breakdown covering liveness probe result, listing age, payer diversity metrics, and reported-vs-verified revenue comparison.
Example use cases
Vetting a new Bazaar API before integrating
“I found an x402 API at https://api.someservice.com/data listed on the Bazaar — can you score its trustworthiness before I wire it into my agent? I want to see the grade, the payer diversity result, and any flags raised.”
Detecting self-dealing in a marketplace listing
“I'm worried this x402 service at https://api.suspiciousvendor.com/endpoint might be faking its own revenue to look popular — can you run a PayerProof check and tell me if the revenue verification or self-dealing flags come back positive?”
Comparing trust grades across multiple x402 services
“I'm evaluating two competing x402 APIs — https://api.service-a.com/v1/query and https://api.service-b.com/v1/query — can you get PayerProof scores for both and tell me which one has the better grade and fewer risk flags?”
Technical details
Endpoint
POSThttps://payerproof-production.up.railway.app/score?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to vet the credibility of a specific x402 service before integrating it or paying for its calls, especially when suspicious of inflated revenue counters, self-dealing, or low payer diversity. It is the right choice over generic on-chain lookup tools because it combines liveness, payer diversity, revenue verification, and listing age into a single graded trust score tailored to the Bazaar/x402 ecosystem.
Side effects
- Resource URL not found in Bazaar listings — returns error indicating unrecognized listing
- Service is unreachable during liveness probe — liveness component fails, score reduced
- On-chain data unavailable for the seller address — revenue verification component incomplete
- Invalid or malformed resource URL input — returns validation error
- Rate limit or payment failure for the $0.02 USDC per-call fee — request rejected
Output
Schema · Response
{
"type": "json",
"example": {
"flags": [
"concentrated_payers"
],
"grade": "B",
"score": 72,
"resource": "https://api.example.com/paid",
"components": {
"liveness": {},
"listingAge": {},
"payerDiversity": {},
"revenueVerification": {}
}
}
}Tags
x402
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