Near-FusionSwap

Near-FusionSwap Seamless Cross-Chain Swaps Between NEAR Protocol and Polygon

Project Identity Near-FusionSwap represents the fusion of two blockchain ecosystems - NEAR Protocol's developer-friendly infrastructure with Polygon's EVM compatibility. The name emphasizes:

"Near": Primary integration with NEAR Protocol blockchain

"Fusion": The seamless merging of different blockchain networks

"Swap": Core token exchange functionality

Using 1inch fusion+ and htlc contarcts we have enabled the cross chain swap between EVM and NEAR ecosystem

Architecture Overview Near-FusionSwap is a sophisticated cross-chain DEX that bridges NEAR Protocol and Polygon networks using a novel Hash Time-Locked Contract (HTLC) approach combined with 1inch's Fusion+ protocol. Here's the technical breakdown:

Core Technologies & Integration

• Rust for Near HTLC contracts
• Next.js 14 with App Router for SSR/SSG
• Wagmi v2 + RainbowKit for multi-wallet support
• Ethers.js v6 for blockchain interactions
• TypeScript for type safety across the entire stack

Real-time Price Feeds: Built a custom useTokenPrices hook that fetches from 1inch API with caching and error handling Cross-Chain Detection: Implemented intelligent swap type detection that automatically switches UI modes

Backend Orchestration (NestJS)

• NestJS framework for scalable TypeScript backend
• Modular service architecture (PolygonService, NearService, OrderService)
• RESTful APIs for cross-chain coordination

Service Separation: Each blockchain has its dedicated service layer for clean separation of concerns Order Management: Custom DTO (Data Transfer Objects) for type-safe API communication