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Web3 Demo — Ethers Backend + React Frontend

Backend

cd backend npm i

.env

RPC_HTTP=https://sepolia.infura.io/v3/<your_key>

PORT=3000

(optional) PRIVATE_KEY=0x<64-hex>

npm start

Frontend (Vite proxy → /api/*)

cd web3-ui npm i npm run dev

API

GET /api/health GET /api/network GET /api/account GET /api/balance/:address POST /api/send-eth # needs PRIVATE_KEY "@ | Set-Content -Encoding utf8 README.md