--- title: Building a Real Smart Contract Web3 Marketplace on... description: A walkthrough of building a Web3 marketplace on Ethereum's Sepolia testnet using Solidity smart contracts, Hardhat, React/Vite, ethers.js, and MetaMask. The... canonical: https://daily.dev/posts/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-jplw1ki0x twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia | daily.dev og:description: A walkthrough of building a Web3 marketplace on Ethereum's Sepolia testnet using Solidity smart contracts, Hardhat, React/Vite, ethers.js, and MetaMask. The... og:url: https://daily.dev/posts/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-jplw1ki0x og:image: https://api.daily.dev/og/posts/JPLW1kI0x.png og:image:alt: Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia **[Coins Bench](https://daily.dev/sources/coinsbench)** · 6 min read · 0 upvotes · 0 comments ## Summary 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. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [Deploying Smart Contracts on Ethereum Sepolia Test Network using Truffle and Alchemy](https://daily.dev/posts/deploying-smart-contracts-on-ethereum-sepolia-test-network-using-truffle-and-alchemy-nilh8lavx) · Coins Bench · 0 upvotes · 0 comments - [How to Create a Smart Contract with Solidity, Hardhat, and MetaMask](https://daily.dev/posts/how-to-create-a-smart-contract-with-solidity-hardhat-and-metamask-5ke5kflnp) · Coins Bench · 2 upvotes · 1 comments - [I Built a Gasless Web3 Escrow Platform on Base Sepolia in 48 Hours Here’s Every Bug That Almost Broke It](https://daily.dev/posts/i-built-a-gasless-web3-escrow-platform-on-base-sepolia-in-48-hours-here-s-every-bug-that-almost-brok-z7rnalgnn) · Coins Bench · 1 upvotes · 1 comments - [Making Blockchain Work, Front to Back](https://daily.dev/posts/making-blockchain-work-front-to-back-1dvoddrvm) · Coins Bench · 2 upvotes · 0 comments - [\[Ethernaut\] 0. Hello Ethernaut](https://daily.dev/posts/ethernaut-0-hello-ethernaut-a1u2bucti) · Coins Bench · 0 upvotes · 0 comments --- Tags: [#ethereum](https://daily.dev/tags/ethereum), [#smart-contracts](https://daily.dev/tags/smart-contracts), [#solidity](https://daily.dev/tags/solidity), [#hardhat](https://daily.dev/tags/hardhat) [View this post on daily.dev](https://daily.dev/posts/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-jplw1ki0x) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Building a Real Smart Contract Web3 Marketplace on Ethereum Sepolia","url":"https://daily.dev/posts/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-jplw1ki0x","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/building-a-real-smart-contract-web3-marketplace-on-ethereum-sepolia-jplw1ki0x"},"datePublished":"2026-07-11T00:22:34.150Z","dateModified":"2026-07-11T00:22:55.573Z","description":"A walkthrough of building a Web3 marketplace on Ethereum's Sepolia testnet using Solidity smart contracts, Hardhat, React/Vite, ethers.js, and MetaMask. 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