x402 Protocol Guide

Follow the HTTP 402 payment sequence and distinguish spending approval, settlement and API delivery.

x402 Protocol Guide is a 4-page PDF field guide. HTTP 402 payment challenges, caller approval and API delivery checks.

• Follow the request, HTTP 402 challenge, payment, retry and delivery sequence.

• Inspect asset, network, recipient, amount and the intended resource.

• Keep spending authorization narrow and caller controlled.

• Separate settlement evidence from correct, accepted API delivery.

Includes a quick-reference workflow and primary-source notes.

Educational information only. Verify current official sources and your own circumstances. No trading return, ranking, citation, traffic or business outcome is guaranteed.