One product's attempt log, paid on the spot ($0.50): the answer GET /api/detail/{slug} gives Builder and Team (each attempt with its time, route, result and evidence, the tips for its owner, the drive record's parts). No key and no plan. It answers 402 with the challenges; pay one (a card through a Stripe Shared Payment Token, USDC on Base by x402 or MPP evm, or USDC on Tempo) and send the same request with the credential. An unknown product: 404; a log not ready: 503; nothing is charged for either. No rate limit.