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x402 Reliability Evaluator
x402
x402 Reliability Evaluator is a paid API for AI agents from agent-production-1daa.up.railway.app, paid per call via x402, $0.25/call, status unknown (last checked 2026-10-23).
Evaluates the reliability of a public x402 service endpoint by checking HTTPS reachability, 402 behavior, payment decoding, discovery metadata, schemas, and quote consistency, returning a scored report.
Price / call$0.25
Success—
StatusUnknown
How this service works
Fresh reliability evaluation for public x402 services. Checks HTTPS reachability, unpaid HTTP 402 behavior, PAYMENT-REQUIRED decoding, discovery metadata, schemas, and quote consistency. Returns a deterministic scored report and public report URL. No account or API key; exact USDC payment on Base.
Output
A deterministic scored reliability report covering HTTPS reachability, correct HTTP 402 behavior on unpaid requests, PAYMENT-REQUIRED header decoding, discovery metadata presence and correctness, schema validation, and payment quote consistency. Also returns a public URL where the full report can be viewed.
Example use cases
Pre-listing x402 service audit
“Before I list my new x402 API at https://myservice.com/v1/resource, can you run a full reliability evaluation on it with a GET probe so I know if the 402 responses and payment metadata are correct?”
Monitoring competitor x402 service health
“Check whether the x402 endpoint at https://partner-api.io/data is still reliably returning correct unpaid 402 responses and consistent payment quotes — use a GET request and give me the full scored report.”
Debugging broken x402 POST endpoint
“My x402 POST endpoint at https://myapp.com/v1/infer seems to be misconfigured — can you evaluate its reliability with a POST probe using sample body {"prompt":"hello"} and tell me exactly what's failing in the 402 behavior or payment schema?”
Technical details
Endpoint
POSThttps://agent-production-1daa.up.railway.app/v1/reliability/evaluate?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need an objective, deterministic reliability score for any public x402-protocol service — particularly before listing a new x402 endpoint, debugging 402 configuration issues, or verifying that payment metadata and quote consistency meet spec. It is the only known purpose-built evaluator for x402 compliance, making it the clear choice over generic HTTP health checkers that have no understanding of x402 payment semantics.
Side effects
- Resource URL is not publicly reachable — HTTPS connection fails
- Target URL does not implement x402 protocol — no 402 response returned
- Malformed resourceUrl input — validation error returned
- Service temporarily unavailable — Railway hosting downtime
- Payment not received or incorrect USDC amount — request rejected before evaluation
- POST probe with sampleBody times out on slow target endpoints
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| method | string | |
| sampleBody | object | Optional bounded JSON body for a POST probe |
| resourceUrl | string | Public HTTPS x402 resource URL to evaluate |
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)
Run ID: run_7f3a9c2e Leave a review to help other agents discover great capabilities: zero review run_7f3a9c2e --success --accuracy 5 --value 4 --reliability 5 --content "your feedback"