BridgeFi

Demo

About

The problem it solves ## 🛠️ The Problem It Solves Decentralized finance (DeFi) has unlocked powerful financial tools like lending, borrowing, and yield generation. However, the current DeFi landscape suffers from **chain fragmentation** — most lending and borrowing protocols are siloed within individual chains. This creates serious limitations: * 🔒 **Liquidity is locked** within a single network, reducing capital efficiency. * 🧩 **Cross-chain lending protocols are either nonexistent or highly complex**, requiring users to interact with multiple dApps, wallets, and bridges. * ⚠️ **Manual liquidation and collateral monitoring** increases systemic risk, leaving protocols vulnerable to undercollateralization during volatile market conditions. * ❌ **Lack of secure and standardized cross-chain communication** exposes users to bridge exploits and poor UX. --- ## ✅ How This Protocol Solves It Our project introduces a **fully decentralized, cross-chain lending and borrowing protocol** that enables seamless collateralization, borrowing, repayment, and liquidation across EVM-compatible chains — specifically **Ethereum Sepolia** and **Avalanche Fuji** testnets. ### 🌉 Chainlink-Powered Cross-Chain Infrastructure * ✅ **Chainlink CCIP (Cross-Chain Interoperability Protocol)** is used to transfer messages and tokens securely between Sepolia and Fuji. * ✅ **Chainlink Price Feeds** deliver real-time, tamper-proof ETH/USD data, ensuring accurate valuation of user collateral. * ✅ **Chainlink Cross-Chain Token Manager** enables deployment of a custom ERC20 token (YOK) across both chains, maintaining a **stable 1 USD peg**, which simplifies borrowing calculations and repayment logic. --- ## 🧠 What Users Can Do ### For Borrowers * 📥 Deposit ETH as collateral on Sepolia. * 💸 Instantly receive YOK tokens on Avalanche Fuji via secure CCIP message. * 💵 Repay YOK tokens on Fuji and unlock ETH collateral on Sepolia automatically. ### For Liquidators * 🔍 Monitor health factor in real-time via Chainlink Price Feeds. * ⚔️ Trigger liquidation if user becomes undercollateralized (health factor ≤ 1). * 💰 Receive a portion of seized ETH collateral as economic incentive. ### For Developers & Protocol Integrators * 🔁 Integrate safe, auditable CCIP messaging for cross-chain operations. * 🛠 Build on a modular lending-borrowing stack with repay, liquidate, and health factor modules. * 📦 Reuse cross-chain token contracts for other dApps needing pegged multi-chain tokens. --- ## 🔐 Why It Matters This protocol demonstrates how **next-generation cross-chain DeFi** can be built securely and reliably using **Chainlink’s decentralized services**. It creates a **trust-minimized lending flow** that: * Reduces reliance on centralized bridges. * Protects users from undercollateralization. * Enables builders to scale lending protocols across chains. With increasing demand for **interoperable DeFi**, this solution addresses real-world limitations and presents a practical, extensible architecture for the next generation of decentralized finance. ---

How it's made

Challenges we ran into ## ⚠️ Challenges I Ran Into ### 🧩 Multi-Chain Liquidity Fragmentation One of the most significant challenges during the development of this cross-chain lending and borrowing protocol was addressing **liquidity fragmentation across multiple blockchains**. When deploying lending pools on different networks (e.g., Sepolia and Avalanche Fuji), each chain operates in isolation by default — **assets, liquidity, and state are not inherently interoperable**. This introduced several hurdles: * 💧 **Liquidity Pools per Chain**: Each network would require its own isolated liquidity pool, leading to inefficient capital utilization and difficulty in maintaining balanced liquidity for lending and borrowing operations. * 🔄 **Cross-Chain State Syncing**: Ensuring accurate tracking of borrowed tokens, repayments, and collateral health across chains was non-trivial. Dealing with **asynchronous messaging delays via Chainlink CCIP** introduced complexity in reconciling state consistency. * ⚠️ **Risk of Under/Over-Supply**: Mismatched liquidity could result in one chain having excess YOK tokens (borrowed) with insufficient ETH collateral on another chain to back them. ---