OverSync
Bridging ETH ↔ XLM with 1inch escrow (mainnet) & Stellar HTLCs. Testnet supported.
Project Description
OverSync is a cross-chain token bridge that enables secure and trustless swaps between Ethereum and Stellar. Built using HTLC (Hashed Time Locked Contracts), OverSync allows users to transfer tokens between the two networks with atomic guarantees. The bridge supports both testnet and mainnet, and features real-time exchange rates, bidirectional transfers, and an automated relayer service. On Ethereum mainnet, OverSync integrates directly with the official 1inch Escrow Factory contract, extending 1inch Fusion+ architecture to support non-EVM chains like Stellar — unlocking new possibilities for cross-chain DeFi.
How it's Made
OverSync consists of four core components:
A custom HTLC smart contract on Ethereum testnet, and the official 1inch Escrow Factory contract on Ethereum mainnet
A Stellar SDK-based HTLC system using claimable balances
A Node.js-based relayer that listens to events on Ethereum and triggers actions on Stellar
A React + Tailwind frontend with real-time exchange rate display and wallet integration
On mainnet, we use the 1inch Escrow Factory to create and manage escrow contracts that integrate seamlessly with the 1inch Fusion+ resolver infrastructure. Pricing is fetched from CoinGecko API, wallets are connected via MetaMask (Ethereum) and Freighter (Stellar), and the relayer handles cross-chain coordination, failure recovery, and resolver logic.
