Melswap
Cross-chain swaps via 1inch Fusion+ with Aptos and Sui blockchains
Demo
About
Melswap is a cross-chain swap protocol built on 1inch Fusion+ that connects Ethereum with non-EVM chains (Aptos and Sui). The design preserves 1inch Fusion+’s Dutch auction + resolver/relayer model while extending it to non-EVM chains. - Deposit tokens from Ethereum into Aptos/Sui instantly - Withdraw tokens back to Ethereum or swap between Move chains with the same atomic guarantees. - Escrows are enforced with hashlocks + timelocks guarantees. - Orders are paid for by resolvers, letting users trade without worrying about gas.
How it's made
Melswap combines EVM contracts, Move modules, and an off-chain service with a browser-based frontend: Ethereum (Sepolia) - Uses 1inch Limit Order Protocol and a custom EscrowFactory for order creation via fillOrderArgs. - Resolver contracts handle order execution and interaction. Aptos (Move) -Custom Order and Escrow objects replicate the LOP escrow logic. - Multi-agent transactions allow both user deposits and resolver incentives to settle atomically. Sui (Move) - Implements object-based escrows with hashlock + timelock guarantees. - Resolvers deploy escrows directly for settlement. Frontend (Next.js + TypeScript) - Built as a browser dApp where users can connect via MetaMask (EVM), Phantom and Petra wallets. Resolver-Relayer Network - Written in TypeScript with scripts that monitor on-chain events. - Listens for new 1inch Fusion+ orders on Ethereum, handles Aptos/Sui escrow deployments, and unlocks funds upon hash preimage reveal. Notable Hacks: - Leveraged gas sponsorship (Aptos) and multi-agent transactions to mimic 1inch’s gasless UX without requiring Permit approvals. - Built Move-based escrow factories that closely match Solidity LOP behavior but in a native Move object model.