The architecture for Aave v4, introduced in the **official Aave Governance Proposal**, introduces a 'Unified Liquidity Layer' designed to dismantle isolated lending deployments across fragmented L2 networks. Utilizing dynamic cross-chain interest rate models, borrowers can now pledge collateral on one network and instantly draw credit lines on another.

Historically, borrowing rates on Arbitrum, Base, and Ethereum diverged wildly due to trapped capital reserves. As defined in the **Aave v4 Core Repository**, native liquidity portals and smart contract abstraction balance systemic supply and demand protocol-wide. For liquidity suppliers, this guarantees optimal capital efficiency and eliminates the risk of stranded inventory in underutilized pools. Aave v4 effectively positions the protocol as the primary settlement and clearinghouse for decentralized cross-chain credit.