LenDen is a decentralized cross-chain lending and borrowing platform that addresses DeFi's liquidity fragmentation problem. Token and NFT holders with assets spread across Avalanche, Polygon, and other chains had no unified way to unlock liquidity without selling. LenDen changes that by letting borrowers collateralize assets on one chain and receive loans on another, while lenders earn interest by supplying capital to a multi-chain treasury.

The platform runs on Router Protocol's cross-talk contracts, which handle the cross-chain messaging required to coordinate collateral locks and loan disbursements across networks. Borrowers post NFT or token collateral, and the system tracks repayment behavior to build a cross-chain credibility score, a reputation layer that surfaces trusted users and adjusts risk accordingly. In the event of loan default, the protocol either retains the collateral or routes it through an on-chain auction mechanism. The stack combines Solidity smart contracts, Next.js for the frontend, Express/Node.js for the backend, Supabase for off-chain data, and Push Protocol for notifications.

I architected and built the full-stack integration: from the smart contract interfaces and cross-talk message routing to the borrower dashboard and credibility scoring logic. The hardest challenge was orchestrating reliable state synchronization across two chains, keeping the collateral lock on the source chain and the loan release on the destination chain atomic and recoverable under failure conditions.

LenDen was built at Unfold 2023, where it won First Place in the Router Protocol track.