Aave, created by Stani Kulechov and originally named ETHLend, evolved from a simple peer-to-peer lending dApp into the largest decentralized lending protocol in crypto, with over $20 billion in TVL by 2024. The protocol allows users to deposit crypto assets as collateral and borrow against them — or supply assets to earn yield from borrowers’ interest payments. It is, in essence, a bank that operates as a smart contract.
Aave pioneered multiple DeFi innovations: flash loans (uncollateralized loans that must be repaid within a single transaction), rate switching (toggle between stable and variable interest rates), credit delegation (letting trusted parties borrow against your collateral), and isolation mode (limiting exposure to riskier assets). Aave V3 (launched 2023) added cross-chain liquidity through “portals” and improved capital efficiency.
The protocol expanded across every major chain — Ethereum, Arbitrum, Optimism, Polygon, Avalanche, Base, and others — making it the most multi-chain DeFi protocol. GHO, Aave’s own stablecoin launched in 2023, aimed to capture stablecoin revenue for the protocol. Aave’s governance (through the AAVE token) has been one of the more active DAO governance systems, with regular proposals on risk parameters, new asset listings, and protocol upgrades.
Aave’s importance to DeFi cannot be overstated. It’s where whales park their crypto to earn yield, where traders borrow to leverage positions, and where the largest onchain lending market operates. When Aave’s interest rates move, it affects capital allocation across the entire DeFi ecosystem. The protocol generating hundreds of millions in annual revenue while operating as permissionless smart contracts — no office, no employees in the traditional sense, no CEO making lending decisions — remains one of DeFi’s most profound achievements.
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