DeFi lending replaces a bank with a smart contract. You deposit assets, earn interest. You borrow against your deposit, pay interest. No applications, no credit scores, no approval delays. Three protocols dominate in 2026.
Aave: the bank of DeFi
Aave is the largest lending market, with over $30B in deposits across Ethereum, Arbitrum, Base, Optimism, Polygon, and Avalanche. Variable and stable rates, isolation mode for risky assets, and the GHO native stablecoin. The reference protocol for most users.
Morpho: matched lending
Morpho matches lenders and borrowers peer-to-peer when possible, falling back to Aave or Compound for liquidity. The result: lenders earn more, borrowers pay less, with the same risk profile. Morpho Blue adds isolated markets where anyone can create a lending pair.
Compound: the original
Compound launched DeFi lending in 2018 and remains a major player, though smaller than Aave by TVL. Compound v3 ("Comet") uses a single borrowable asset per market for simpler risk. Trusted, audited, conservative.
How lending works under the hood
You deposit USDC into Aave. The protocol mints you aUSDC, a receipt token that grows in value as borrowers pay interest. To withdraw, burn aUSDC and receive USDC plus accrued interest. APY changes second-by-second based on utilization (how much of the pool is borrowed).
How borrowing works
Deposit collateral (say, 1 ETH worth $3,500). The protocol assigns a Loan-to-Value (LTV) ratio (75% for ETH on Aave). You can borrow up to $2,625 in USDC. If ETH falls and your loan exceeds the liquidation threshold (~82.5%), part of your collateral is sold to repay the loan, plus a 5–10% liquidation penalty.
Avoiding liquidation
- Keep your loan well below the liquidation threshold — aim for 50% LTV maximum.
- Use less volatile collateral. ETH/USDC pairs are simpler than ETH/SOL pairs.
- Set up monitoring alerts via DeFiSaver, InstaDApp, or HAL.
- Refinance to lower rates as your position grows.
Typical 2026 yields
- USDC supply on Aave: 3–7%.
- ETH supply: 1.5–2.5% on top of staking.
- GHO borrow on Aave: 5–8%.
- WBTC supply: 0.5–1.5% (low utilization).
Compare protocols in our stablecoin yield guide or learn about yield farming.
