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jurat.dev x402 Preflight Conformance Check
x402
jurat.dev x402 Preflight Conformance Check is a paid API for AI agents from jurat.dev, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15).
Runs a conformance check on a URL's x402 payment endpoint, verifying that it follows the x402 spec and is safe to pay before an agent commits funds
Price / call$0.005
Success—
StatusUnknown
How this service works
Audit any x402 endpoint before you pay it: reads the live HTTP 402 challenge, decodes the payment terms, and compares the price advertised in its openapi.json against the price actually charged. Returns a compliance verdict, a safe-to-pay signal and a per-check fix list. Catches silent price drift, unpayable challenges, and the misconfigurations that make discovery indexes drop a resource.
Output
Returns a JSON object containing: an array of individual check results (each with check name, detail, and pass/fail/skip status), the target URL, a summary of total checks run and how many passed/failed/warned/skipped, an overall verdict (pass/fail), the live payment terms extracted from the endpoint (pay_to address, network, price_usd, amount_atomic), a safe_to_pay boolean, and an is_paid_resource boolean.
Example use cases
Verify unknown paid API before paying
“I found this API at https://example-api.dev/v1/data that charges USDC via x402 — can you run a preflight check on it and tell me if it's actually spec-compliant and safe before I let you pay for it?”
Debug x402 implementation on own service
“I just deployed my x402-paid endpoint at https://myservice.dev/v1/query — can you run the conformance check on it and tell me which checks passed or failed so I can fix any issues?”
Pre-authorize agent to call paid endpoint
“My agent is about to start calling https://datastream.ai/v1/feed repeatedly and paying in USDC each time — can you do a preflight conformance report first to confirm the price and payment address are what I expect?”
Technical details
Endpoint
GEThttps://jurat.dev/v1/preflightWhen to prefer
Use this endpoint when an AI agent needs to verify an x402-paid API before committing USDC payments — especially for unknown or newly discovered paid endpoints, to confirm price agreement between the spec and live response, validate the payment address and network, and get an overall safe_to_pay signal before any funds are spent. Prefer this over blindly calling a paid endpoint when trust in the endpoint's x402 implementation is uncertain.
Side effects
- Target URL is unreachable — endpoint returns error or empty response
- Target URL is not an x402-enabled resource — is_paid_resource returns false
- Price mismatch between spec and live 402 response — check fails with detail explaining discrepancy
- Network identifier in payment terms is unsupported or malformed
- pay_to address is missing or invalid — check flagged as failure
- Conformance summary shows failures > 0 with verdict 'fail' indicating unsafe to pay
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"checks": [
{
"check": "price_agreement",
"detail": "spec and live 402 both say $0.005000",
"status": "pass"
}
],
"target": "https://zaref.dev/v1/repo-prime",
"summary": {
"checks": 18,
"passed": 17,
"skipped": 1,
"failures": 0,
"warnings": 0
},
"verdict": "pass",
"live_terms": {
"pay_to": "0x…",
"network": "eip155:8453",
"price_usd": "0.005000",
"amount_atomic": "5000"
},
"safe_to_pay": true,
"is_paid_resource": true
}
}Tags
x402
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