x402 EVM Implementation Specification
protocol-specificationproduction
Detailed technical specification for implementing x402 exact payment scheme on Ethereum Virtual Machine compatible chains.
Last verified on 2026-01-28
What It Is
Detailed technical specification for implementing x402 exact payment scheme on Ethereum Virtual Machine compatible chains.
How It Fits in x402
specificationevm-integration
both
BaseEthereumPolygonAvalancheNetworkNetwork
ERC-20USDCEIP-3009EIP-2612
Developer Notes
{{sdks}}
specification
Contribute
About x402 Guild
x402 Guild is a community-driven effort to maintain an open x402 dataset and a periodic “State of x402” report.