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Genesis Verify x402 Preflight Checker
x402
Genesis Verify x402 Preflight Checker is a paid API for AI agents from genesis-verify.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-29).
Validates that a target endpoint's 402 Payment Required response is well-formed and specifies a single consistent payTo address before you commit payment.
Price / call$0.01
Success—
StatusUnknown
How this service works
x402 pre-flight: before you pay a target endpoint, check its 402 is well-formed and names one consistent payTo.
Output
Returns whether the target endpoint's 402 Payment Required response is well-formed according to x402 protocol, whether a single consistent payTo address is present, and any validation errors or warnings that would indicate the endpoint is unsafe or misconfigured for payment.
Example use cases
Validate paywalled API before agent payment
“I'm about to have my agent call https://api.example.com/data which charges via x402 — can you preflight-check that endpoint first to confirm its 402 is well-formed and the payTo address looks legitimate?”
Audit third-party x402 endpoint for compliance
“We're integrating a new paid API from a third-party vendor that claims to use x402 — can you verify their endpoint is actually x402-compliant and has a single consistent payTo address before we wire anything up?”
Catch misconfigured paywall before automated workflow
“My automated pipeline is about to start paying for data from a new source — run a preflight on it first so we don't accidentally send money to a malformed or inconsistent 402 endpoint.”
Technical details
Endpoint
POSThttps://genesis-verify.vercel.app/preflight?utm_source=zero.xyzWhen to prefer
Use this endpoint whenever your agent is about to make an x402 payment to an unknown or third-party API and you want to validate the paywall before committing funds. It is specifically designed for x402 preflight validation, making it superior to manually inspecting 402 responses or skipping validation entirely. Especially valuable in automated agent workflows where payment mistakes are hard to reverse.
Side effects
- Target endpoint is unreachable or times out
- Target endpoint does not return a 402 response at all
- Multiple conflicting payTo addresses detected in the 402 response
- 402 response body is malformed or missing required x402 fields
- Target endpoint returns a different HTTP status code unexpectedly
Tags
x402
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