Buyer-side trust probe of a paid x402 endpoint: (1) challenge health — fetch unpaid and validate the 402 structure; (2) liveness — latency and stability of the unpaid surface; (3) on-chain settlement history from public Base JSON-RPC (distinct payers, recent settle tx count); (4) sybil fan-out signal; (5) optional (settle_probe=true) signed PROBE PLAN of what would be bought. Signed verdict: trusted / caution / untrusted.

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