fusion

Problem Statement

This project enables trust-minimized cross-chain swaps between multiple chains using a combination of:Limit Order Protocol on EVM-compatible chainsHashed TimeLock Contracts for StarknetPlace or fill orders via LOP.Lock assets on one chain using HTLC.Redeem or refund tokens depending on secret/key revelation.

Solution

EVM Chains (Sepolia, Monad)Integrated 1inch Limit Order Protocol (LOP) for off-chain signed orders.Deployed a custom LOP contract on Monad to replicate Sepolia functionality.Built an Escrow Factory contract to spawn HTLC instances per swap.StarknetDeployed a Cairo-based Factory contract for asset locking and timed refunds.Used scripts + wallet keys from .env to interact directly with the contracts.Swap FlowUser signs an order with LOP on Sepolia/Monad.Counterparty locks funds in an HTLC on Starknet (or Monad).The secret preimage revealed on redemption enables unlocking on the opposite chain.Scripts orchestrate executionInteractive CLI ToolBuilt a command-line interface that lets users initiate and complete swaps interactively.Supports bi-directional swaps between Sepolia ↔ Monad ↔ Starknet.Users can specify custom tokens, amounts, and counterparties without touching contracts manually.Tech stackNode.js CLI with inquirer for prompts and interactive flows.ethers.js for EVM contracts, starknet.js for Starknet.