Cross Chain Swaps and Beyond With 1inch I Matt Snow

Sun, Nov 2, 2025, 12:00 AM

Matt Snow (1inch) outlines three swapping rails: Classic aggregation (AMM/PMM) that routes and splits orders across ~400 liquidity sources to maximize output while minimizing gas; Fusion, an intent-based, gasless Dutch-auction system where professional “resolvers” compete to fill signed user orders (often above on-chain market rates); and Fusion+, which extends Fusion cross-chain using hash time-locked contracts (HTLCs) for trustless escrow on source and destination chains with fallback if a resolver fails. Classic 1inch can even route purely through Uniswap more gas-efficiently than Uniswap’s own router, while Fusion lets resolvers source liquidity anywhere (CEX/DEX/off-chain/cross-chain) and batch partial fills. For developers, 1inch offers a dev portal (API keys, docs, Swagger), SDKs (TypeScript/Go), and a deployable proxy (e.g., on Vercel) to protect API keys from front-end calls. Bounties include: non-EVM Fusion+ extensions (build HTLC escrows on an EVM + a non-EVM chain and demonstrate deposits/withdrawals), Limit Order Protocol extensions (advanced triggers and pre/post interactions), and API usage (balances, spot prices, portfolio). 1inch recently brought Fusion/Fusion+ to Solana, signaling a broader non-EVM push and framing Fusion+ as a UX-simple, rate-optimized, and trustless alternative to traditional bridges. 00:02 – Intro & agenda (classic swaps, Fusion, Fusion+) 01:15 – 1inch scale & origins (hackathon → $750B+ volume) 01:38 – Supported chains (EVM; Fusion/Fusion+ on Solana too) 01:59 – Classic aggregation: routing, split orders, gas optimizations 03:45 – Gas comparison vs Uniswap router 04:08 – Fusion intents: signed orders, Dutch auctions, gasless fills 05:42 – What is a resolver? Competition & partial fills 07:59 – Real trade example: fills above market rate 09:12 – Liquidity sources (CEX/DEX/off-chain/cross-chain/RWAs) 10:24 – Fusion+: cross-chain via HTLCs, UX & trustlessness 11:51 – HTLC basics: secrets, time locks, safety deposits 12:51 – Cross-chain flow: escrows, relayer, secret reveal, fallback 15:33 – Dev portal, docs, SDKs, proxy requirement 17:56 – Other APIs: spot price, balances, portfolio 18:34 – Bounties: non-EVM Fusion+, limit orders, API usage 19:19 – Links, support, Discord _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 🇮🇳 *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 1inch* X: https://x.com/1inch ✅ *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