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