x402 and MPP seller integrity audit for one exact paid GET or POST route after a buyer integration fails, a seller changes the route, or before the next paid retry or release. Returns machine_buyable, contract_ready, or repair_required with exact repair actions. Checks constructible non-secret input, live unpaid GET terms, optional Bazaar metadata, and buyer-required success paths. Uses no credential or target payment, follows no redirect, and sends no target POST.

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