x402 Whitepaper
learning-communityproduction
Official protocol specification and design rationale for the x402 payment standard.
Last verified on 2026-01-26
What It Is
Official protocol specification and design rationale for the x402 payment standard.
How It Fits in x402
{{role}}
both
{{networks}}
Developer Notes
{{sdks}}
clientserver
Contribute
About x402 Guild
x402 Guild is a community-driven effort to maintain an open x402 dataset and a periodic “State of x402” report.