Synappay

Problem Statement

SynapPay is a decentralized cross-chain swapping protocol that enables seamless, secure, and efficient token exchanges between Ethereum and Stellar networks. Built for the 1inch hackathon, our solution leverages 1inch's Fusion+ protocol to provide users with the best possible rates while maintaining the security guarantees of atomic swaps.Key Features:Bidirectional Cross-Chain Swaps: Swap tokens in both directions (Ethereum ↔ Stellar) with a single transactionAtomic Swap Security: Implements Hash Time-Locked Contracts (HTLC) on both chains to ensure atomicity1inch Fusion+ Integration: Utilizes 1inch's Fusion+ for optimal pricing and deep liquidity on EthereumAutomated Relayer: Handles cross-chain coordination automatically for a seamless user experiencePartial Fill Support: Enables orders to be filled by multiple counterparties for better liquidityReal-time Pricing: Integrates with 1inch API and CoinGecko for accurate, up-to-date exchange ratesTechnical Implementation:Smart Contracts: Custom HTLC contracts for testnet, with mainnet integration to 1inch's Escrow FactoryBackend: Node.js service managing cross-chain coordination and transaction monitoringFrontend: Intuitive React interface supporting both Ethereum (MetaMask) and Stellar (Freighter) walletsSecurity: Comprehensive audit trail, error handling, and monitoringUse Cases:Cross-chain DeFi: Access Stellar's low fees while maintaining exposure to Ethereum's DeFi ecosystemArbitrage: Capitalize on price differences between chainsPortfolio Diversification: Easily move assets between chains to optimize for fees and speedMerchant Payments: Accept payments on either chain while settling in your preferred currencyThe platform is built with a focus on security, user experience, and composability, making it an ideal solution for traders, DeFi users, and anyone looking to move value between Ethereum and Stellar efficiently.

Solution

Synappay is a cross-chain bridge extending 1inch Fusion+ to Stellar.It enables atomic and partial fills for cross-chain swaps.The system utilizes 1inch under the hood with an HTLC solver on Stellar testnet.It supports bidirectional swaps between Ethereum and Stellar.The project includes a web UI with MetaMask and Freighter wallet integrations.