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Aether x402 Preflight Auditor
x402
Aether x402 Preflight Auditor is a paid API for AI agents from aether-x402.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-10).
Audits a public x402-gated endpoint to verify it is correctly configured and payable via USDC on Base, returning a scored verdict with pass/warn/fail checks.
Price / call$0.01
Success—
StatusUnknown
How this service works
Pay-per-call Base onchain data, token risk verdicts and x402 payability audits over x402 (USDC on Base).
Output
Returns a JSON object with a numeric score (0-100), an array of individual checks each with a status (pass/warn/fail), a detail message, and a suggested fix, plus aggregated counts by status, a human-readable summary string, and an overall verdict of 'pass' or 'fail'.
Example use cases
Diagnose broken x402 payment config
“My x402 endpoint at https://myapi.com/api/data keeps failing when agents try to pay — can you run a preflight audit on it as a POST with body {"symbol": "ETH"} and tell me what's misconfigured?”
Vet a third-party x402 API before integrating
“Before I wire up my agent to pay for calls to https://partner-service.io/api/prices, can you audit that endpoint to make sure it genuinely accepts USDC on Base (eip155:8453) and won't cost more than $0.10 per call?”
Validate payTo address checksum on new endpoint
“I just deployed a pay-per-call endpoint at https://aether-x402.vercel.app/api/x402/token-risk — can you run a preflight check on it as a GET request and verify the payTo wallet address has a valid EIP-55 checksum?”
Technical details
Endpoint
POSThttps://aether-x402.vercel.app/api/x402/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to programmatically verify that an x402-gated API is correctly configured before attempting to pay and call it — especially useful for agents integrating new pay-per-call services, developers debugging their own x402 endpoints, or marketplace operators validating listed services. Prefer this over manual inspection when you need a structured, scored audit with actionable fix recommendations rather than raw HTTP inspection.
Side effects
- Invalid or unreachable URL returns an error or low-score fail verdict
- payTo address with bad EIP-55 checksum triggers a fail check with fix guidance
- Endpoint does not support the expected asset or network, causing verdict fail
- Missing or malformed x402 payment headers on the target endpoint cause multiple fail checks
- Rate limiting or network timeouts if the target URL is slow to respond
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | Public https URL of the paid x402 endpoint to audit |
| body | — | Example JSON body the endpoint accepts |
| expect | object | What the paying caller needs: fails the audit if the endpoint cannot be paid this way |
| method | — | Defaults to POST when body is supplied, otherwise GET |
| headers | object | Non-credential headers the endpoint needs before its paywall (e.g. Idempotency-Key) |
Output
Schema · Response
{
"type": "json",
"example": {
"score": 67,
"checks": [
{
"id": "accepts[0].payTo",
"fix": "Copy the receiving address directly from your wallet; a bad checksum usually means a mistyped character.",
"detail": "payTo has an invalid EIP-55 checksum (likely a typo)",
"status": "fail"
}
],
"counts": {
"fail": 1,
"pass": 9,
"warn": 1
},
"summary": "FAIL: 9 passed, 1 warning(s), 1 failure(s).",
"verdict": "fail"
}
}Tags
x402
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