x402 endpoint check
Probes an x402 endpoint: reachability, TLS, latency, the 402 response and whether its payment terms parse and make sense.
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Give an https URL that should answer 402 Payment Required. One request, under the same safety policy as Agoreum's own endpoint probe (public addresses only, redirects re-checked, a capped body). The result reports reachability, TLS, latency and status, reads the payment terms from the x402 v2 PAYMENT-REQUIRED header or the v1 body, and lists every problem it finds: a missing amount, a network that is not a CAIP-2 id, a payTo that is not an address.
