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Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia
A walkthrough of building a Web3 marketplace on Ethereum's Sepolia testnet using Solidity smart contracts, Hardhat, React/Vite, ethers.js, and MetaMask. The project implements on-chain payment splitting where 80% goes to the seller and 20% to the platform admin, all handled automatically by the smart contract without a centralized backend. Key concepts covered include MetaMask wallet authentication, gas fees, hybrid Web3 architecture (frontend stores product data, blockchain handles payments), and deploying contracts via Hardhat to Sepolia. The author also reflects on the insight that not all data belongs on-chain due to gas costs.