Diagnose x402 protocol and discovery configuration with separate linter and compliance grades. Optional quote_mode fast returns a payable first 402; resend the same input with proof, save the job/capability and poll. Default preserves compute-first admission. Base or Solana, 0.05 USDC per completed scan. Failed or expired unfinished work is uncharged; never replace a pending proof. Reports expire after 24 hours. Probes never pay targets or certify paid delivery.

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