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🧵 How to Create an ERC20 Token in Solidity Want to launch your own token on Ethereum? Here’s a complete step-by-step guide to writing and deploying an ERC20 token using Solidity + OpenZeppelin. Let’s get started 👇
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1/ What’s an ERC20 Token? ERC20 is the most widely adopted standard for fungible tokens on Ethereum. Think stablecoins like $USDC or governance tokens like $UNI. Every ERC20 follows a shared interface so wallets, exchanges & dApps just work with it.
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2/ Why ERC20 matters 🔁 Fungible: 1 token = 1 token 🛠 Interoperable: Plug & play with MetaMask, Uniswap, Aave 🧱 Composable: Base layer for DAOs, dApps, staking, governance Common use cases: - Stablecoins - DAO tokens - Reward points - Game assets
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3/ Key Functions in ERC20 Here's what every ERC20 token must (or should) implement:
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4/ Writing Your Token in Solidity Use OpenZeppelin – it's secure and audited. Here’s a simple ERC20 token with optional minting:
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5/ Local vs Browser Dev (both great for beginners) 👨‍💻 Remix (http://remix.ethereum.org) Zero setup ⚙️ Scaffold-ETH 2 + Hardhat Full-stack dev env Great for scaling up https://scaffoldeth.io/
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6/ Deployment Flow 1. Compile the contract (yarn compile or Remix) 2. Deploy it with constructor args (name, symbol, supply) 3. Get contract address 4. Add token to MetaMask 5. Interact via frontend / block explorer / CLI
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7/ How ERC20 Transfers Work ✅ Direct token transfer - 🔄 transfer(to, amount) ✅ Delegated transfer (like Uniswap pulling tokens) - approve(spender, amount) - transferFrom(from, to, amount)
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8/ Pro Tips - Use OpenZeppelin standard - Think in decimals() — 1 token = 10^18 units - Secure the mint() function (or remove it!) - Always test locally + on testnets - Verify your contract on Etherscan (yarn verify)
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9/ What’s Next? Now that you’ve built your own token… 🚀 Try the Token Vendor Challenge: Build a vending machine for your ERC20. https://speedrunethereum.com/challenge/token-vendor
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