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Aave
Aave is the main DeFi money market. You supply crypto to earn interest or borrow against collateral you already deposited. No bank account. Wallet connects, smart contracts hold the pools. V3 runs on Ethereum plus many L2s (Arbitrum, Base, Optimism, and more). Rates move with utilization. Borrowers live or die by a Health Factor. Biggest lending protocol by TVL for years. Powerful, liquid, and unforgiving if you ignore liquidations.