Deploying a DEX I Austin Griffith

Sun, Nov 2, 2025, 12:00 AM

Austin Griffith continues his Ethereum building series by showing how to deploy a decentralized exchange (DEX) using Scaffold-ETH and the Speedrun Ethereum curriculum. He begins by revisiting the simple counter app from the previous session, deploying it to Arbitrum, and explaining why developers should move beyond testnets to use inexpensive Layer 2s for real deployments. After configuring Scaffold-ETH to point to Arbitrum, he connects a wallet, interacts with the live contract, and emphasizes publishing both the smart contract and frontend to IPFS. Austin then introduces the concept of scaling from simple apps to real-world use cases by following Speedrun Ethereum challenges—covering NFTs, staking systems, token vendors, games, and eventually, DEXs. He walks through the logic behind building decentralized systems where users don’t have to trust intermediaries. Starting with staking and token sales, he explains how incentives and state machines create autonomous coordination among users. The talk culminates with the DEX concept, describing how liquidity pools and constant-product equations (x*y=k) enable trustless token swaps. Liquidity providers earn small fees while users trade freely, and developers act as the “hardware builders” creating these hyperstructures that can’t be censored or shut down. He closes by connecting DEXs to broader DeFi concepts like overcollateralized lending and stablecoins, showing how these building blocks power the next level of onchain finance. 00:00 – Recap: deploying the first app 00:37 – Reviewing the local counter app 00:59 – Deploying to Arbitrum 02:19 – Why to skip testnets and use L2s 02:58 – Switching Scaffold-ETH to live networks 03:28 – Interacting with deployed contracts 03:52 – Introduction to Speedrun Ethereum challenges 04:39 – Building multiple projects for experience 05:23 – Real-world onchain use cases 06:09 – Canonical records and attestations 07:01 – NFTs as credentials and token gating 07:52 – Staking app for coordination and trustless DAOs 08:56 – The state machine pattern in smart contracts 11:10 – Incentives and automation in DeFi design 12:19 – Handling failure and refunds securely 13:46 – Token vendor and ICO mechanics 14:38 – Onchain games, randomness, and commit-reveal 17:14 – The DEX as a hyperstructure 18:47 – From order books to automated market makers 19:32 – Liquidity reserves and the constant-product formula 20:22 – Incentives for liquidity providers 21:17 – How DEXs enable trustless swapping 21:55 – Developers as hardware builders 22:22 – Build Guild onboarding and developer growth 23:04 – Scaling through mainnet and L2 deployments 24:08 – Intro to overcollateralized lending and DeFi concepts 31:32 – Closing remarks and next sessions preview _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇮🇳 *ETHGlobal New Delhi* This workshop is specifically for ETHGlobal New Delhi, a 3-day hackathon held September 19-21 at the India International Convention & Expo Centre, bringing together the most skilled web3 developers, designers and product builders from all around the globe for a weekend-long adventure to advance the Ethereum ecosystem! Watch the full ETHGlobal New Delhi 2025 playlist here: https://www.youtube.com/playlist?list=PLXzKMXK2aHh7zCFW3hBqatZ18rQaYeEJL _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ ✅ *Follow BuidlGuidl* X: https://x.com/buidlguidl ✅ *Follow ETHGlobal* X: https://x.com/ETHGlobal​ Warpcast: https://warpcast.com/ethglobal Website: https://ethglobal.com YouTube: https://www.youtube.com/c/ETHGlobal _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _Are you interested in Ethereum development and entrepreneurship?_ 👉 Sign up for the next ETHGlobal event: https://ethglobal.com/events 🎁 Get exclusive access and perks with ETHGlobal Plus! https://ethglobal.com/plus 📣 Want us to throw an event in your city? Tell us where! https://ethglobal.com/city