Melswap

Problem Statement

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 instantlyWithdraw 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.

Solution

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 NetworkWritten 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.