fusion
Cross-chain swaps using Limit Order Protocol and Fusion+ on Sepolia, Monad and Starknet.
Demo
About
This project enables trust-minimized cross-chain swaps between multiple chains using a combination of: - Limit Order Protocol on EVM-compatible chains - Hashed TimeLock Contracts for Starknet 1. Place or fill orders via LOP. 2. Lock assets on one chain using HTLC. 3. Redeem or refund tokens depending on secret/key revelation.
How it's made
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. Starknet - Deployed a Cairo-based Factory contract for asset locking and timed refunds. - Used scripts + wallet keys from .env to interact directly with the contracts. Swap Flow - User 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 execution Interactive CLI Tool - Built 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 stack - Node.js CLI with inquirer for prompts and interactive flows. - ethers.js for EVM contracts, starknet.js for Starknet.