What Aave Is
Aave describes itself as a decentralized, non-custodial liquidity protocol: users supply crypto assets to earn yield, borrow against collateral, swap positions, and use the GHO stablecoin, across major blockchain networks. In plain terms, it is a money market run by smart contracts instead of a bank: the rules are in code, and you interact with them from your own wallet.
Where It Came From
The project was founded in 2017 as ETHLend by Stani Kulechov, and it started out as a peer-to-peer lending platform, where borrowers and lenders had to be matched with each other. In January 2020 it relaunched under the name Aave, a Finnish word for "ghost", and moved to a pooled-liquidity model. That change is the core of how it works today.
How Lending and Borrowing Work
Depositors add assets such as ETH, USDC or DAI to a shared pool and earn variable interest on what they supplied. Borrowers draw from the same pool, but they must lock up collateral worth more than the loan. That over-collateralization is what lets the system lend without knowing anything about who the borrower is. Aave has also let borrowers choose between variable and stable interest rate modes, so it is worth checking which options a given market currently offers before you borrow.
Flash Loans
Aave is also known for flash loans: short-term loans that must be borrowed and repaid within a single block. They need no collateral because the whole transaction reverses if repayment fails, and they are mostly a tool for developers and advanced traders.
The GHO Stablecoin
In 2023 Aave announced GHO, a decentralized stablecoin backed by collateral deposited within the Aave protocol. It extends the protocol from lending existing assets to issuing one of its own, and it is one of the products featured on Aave's website today alongside its governance and staking systems.
Governance and the AAVE Token
Aave is open source and governed by holders of the AAVE token through a decentralized autonomous organization (DAO). Token holders vote on proposed changes to the protocol, which means the community, rather than a single company, decides how the system evolves. Aave's site also references multiple protocol versions, including Aave v3 and v4, and a staking mechanism called Umbrella.
What to Weigh Before Using It
In February 2025, Bloomberg reported Aave as the largest decentralized finance lending platform by deposits, but size is not safety, and no listing here is a recommendation. Using a lending protocol carries risks that a bank account does not. Smart contract bugs can lose funds even in audited code, and if the value of your collateral falls far enough, your position can be liquidated and you lose part of it. Borrowing against volatile assets magnifies both gains and losses. Start small, read the current documentation for the specific market you plan to use, and only commit money you can afford to lose. This summary is educational and not financial advice.