Melswap
Cross-chain swaps via 1inch Fusion+ with Aptos and Sui blockchains
Melswap
Created At
ETHGlobal New Delhi
Winner of
1inch - Non-EVM Extensions for 1inch Cross-chain Swap (Fusion+) 1st place
Project Description
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.
