LenDen
ROUTER PRIZE · UNFOLD 2023CHAIN A · Polygon
250 USDC + 1 NFT
collateral · locked
CHAIN B · Ethereum
0.08 WETH
loan · released
Assets sit scattered across Avalanche, Polygon, and beyond, with no unified way to unlock liquidity without selling.
LenDen lets borrowers collateralize assets on one chain and receive loans on another, while lenders earn interest supplying a multi-chain treasury. It tracks repayment behavior to build a cross-chain credibility score, and on default, retains the collateral or routes it through an on-chain auction. Won First Place in the Router track at Unfold 2023.
The platform runs on Router Protocol's cross-talk contracts, which carry the messaging that coordinates collateral locks and loan disbursements across networks. Borrowers post NFT or token collateral; the system tracks repayment to build a cross-chain credibility score that surfaces trusted users and tunes risk.
COLLATERALIZE
lock NFT / token on the source chain
Solidity
MESSAGE
cross-chain coordination
Router cross-talk
BORROW
loan released on the destination chain
Solidity
SETTLE
repay → credibility, or default → auction
Push Protocol
The hardest challenge was orchestrating reliable state sync across two chains, keeping the collateral lock on the source and the loan release on the destination atomic and recoverable under failure:
atomic cross-chain state
lock and release coordinated as one operation
recoverable on failure
no stranded collateral when a hop fails
credibility scoring
repayment history as a cross-chain reputation layer
default auction
on-chain liquidation when a loan goes bad