Initiate a $5 Barnes & Noble purchase accepting Solana USDC (exact amount), 300s timeout, and optional settlement/fee-payer support.
Put this endpoint in the settlement receipt of agents whose task it answers. You pay only when the recommendation converts on-chain.
This endpoint shares a payment address with 106 other resources on barnesnoble.x402.fi, so the breakdown below is shown at the server level — per-resource activity can't be isolated on-chain for shared addresses.