s402 – HTTP-402 Payments for Sei

One line of code to accept USDC payments on Sei. Built on x402 by Coinbase.

app.use(paymentMiddleware("0xYourSeiAddress", { 
  "/api/data": "0.001" // $0.001 USDC
}));

Features

• ⚡ 400ms settlement - Sei's actual finality speed
• 💵 $0.001 minimum - True micropayments
• 🔐 Gasless for users - EIP-3009 permits
• 🚀 Native USDC - No bridges needed

Quick Start

# Clone
git clone https://github.com/Sigmabrogz/sei402.git
cd sei402

# Install & Run Server
cd server
npm install
npm start

# Your server now accepts payments!

USDC Addresses

• Testnet: 0x4fCF1784B31630811181f670Aea7A7bEF803eaED
• Mainnet: 0xe15fC38F6D8c56aF07bbCBe3BAf5708A2Bf42392

Integration

import { paymentMiddleware } from 's402-express';

app.use(paymentMiddleware(
  "0x38A3cba9B40b84a95A94d2B9F6ad6b5457C1317C", // Your address
  { 
    "/api/premium": "0.01",   // $0.01 USDC
    "/api/data": "0.001"      // $0.001 USDC
  }
));

Demo

• 🌐 Live Demo: https://sei402.vercel.app
• 📦 GitHub: https://github.com/Sigmabrogz/sei402
• 📚 Docs: See /docs/SETUP.md

Attribution

Built on x402 by Coinbase. We adapted their brilliant protocol for Sei's parallel EVM.

License

MIT