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x402 Preflight
x402
x402 Preflight is a paid API for AI agents from dznviqumoishbyp7dtbwld5444.srv.us, paid per call via x402, $0.004/call, status down (last checked 2026-10-20).
Probes an x402 payment-gated endpoint without paying to return a preflight report revealing its payment requirements and any mismatches with expected parameters.
Price / call$0.004
Success—
StatusDown
How this service works
One unpaid-probe preflight report for an x402 endpoint.
Output
A preflight report describing the x402 endpoint's declared payment requirements (recipient address, network, price), plus any blocking findings such as pay_to mismatches, unexpected networks, or prices exceeding the specified ceiling — all gathered without making a payment.
Example use cases
Pre-integration payment audit
“Before I wire up my agent to call https://payments.example.com/report, can you preflight it and confirm the pay_to address is 0xDEAD...BEEF on the base network and that it costs no more than 500000 base units?”
Detect recipient address mismatch
“I've heard that https://partner-api.example.com/feed claims to pay 0xOriginal...Addr, but I'm worried someone changed it — can you probe it and flag any mismatch from what I was promised?”
Budget check before agent payment
“My agent is about to call https://data.example.com/prices on base — can you run a preflight first and tell me what the actual price is so I know if it's within my 2000000 base-unit budget before it spends anything?”
Technical details
Endpoint
POSThttps://dznviqumoishbyp7dtbwld5444.srv.us/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever an agent or developer needs to verify the payment parameters of an x402-gated API before committing funds. It is the right choice when you want to confirm pay_to address, network, and price without spending USDC, or when you need to detect fraudulent or misconfigured payment details. Prefer it over directly calling the paid endpoint when trust in the payment recipient has not been established, or when budget validation is required before automated payment.
Side effects
- Target URL is not reachable or returns non-402 status — report indicates endpoint is not a valid x402 resource
- pay_to address in the response differs from the expected value — report flags this as a blocking finding
- network mismatch between actual and expected — blocking finding returned
- Endpoint returns a malformed x402 payment header — report may be incomplete or error out
- Non-HTTPS URL provided — rejected before probing
- Preflight service itself is unreachable — HTTP error returned
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| url | string | The x402 endpoint to probe (unpaid). Must be https. |
| expect | object |
Tags
x402
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