Step-by-Step SDK Setup
1
Install Gateway Daemon via NPM
Retrieve our verified integration package locally to register transaction listening processes.
npm install @x402/gateway-relay-sdk
2
Enforce Wallet Permission Headers
Mount the payment required interceptor inside your root resource delivery middleware.
import { Interceptor } from '@x402/gateway';
app.use(Interceptor({ cap: '0.05 USDC' }));
app.use(Interceptor({ cap: '0.05 USDC' }));