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Look a paid x402 or MPP URL up in vet402's public record of real purchases before the agent pays it. BLOCK stops the tool call, and a WARN backed by evidence against the seller asks for approval. Disclosure — sends each guarded or model-queried URL (scheme, host and path; userinfo, query and fragment stripped) to vet402.com in up to two HTTPS GETs; fails open, so a vet402 outage or unknown URL lets the payment run unless VET402_UNKNOWN=approve.