DeFi Lending
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
DeFi lending allows crypto holders to earn interest by depositing assets into lending protocols, while borrowers access loans by providing overcollateralized crypto as security — all automated by smart contracts with no bank required.
DeFi lending protocols allow two things simultaneously: depositors earn interest on idle assets, and borrowers access capital without credit checks — using crypto as collateral.
How it works: 1. Depositors supply assets (ETH, USDC, BTC) to a lending pool 2. Borrowers deposit collateral (typically 150%+ of loan value) to borrow 3. Interest rates adjust algorithmically based on pool utilization 4. Smart contracts automatically liquidate borrowers whose collateral drops below the required ratio
Why overcollateralization? - No credit checks exist on-chain (no identity verification) - Collateral ensures borrowers can be liquidated before the protocol becomes insolvent - If ETH drops 40%, a 150% collateral position can still be liquidated profitably
Major lending protocols: - Aave: multi-chain, supports flash loans, the most feature-rich - Compound: pioneered the model, now has Compound III (Comet) - JustLend: dominant on TRON - Venus: BNB Chain lending
Use cases for borrowing: - Leverage: borrow to buy more crypto without selling existing holdings - Short selling: borrow an asset, sell it, buy back cheaper - Liquidity without selling: access cash while maintaining crypto exposure
Risk for depositors: smart contract bugs and mass liquidation events can threaten deposited funds. Stick to audited, long-established protocols.
Frequently Asked Questions
What interest rates can I earn with DeFi lending?
Interest rates fluctuate based on supply and demand in each pool. Stablecoin lending (USDC, USDT) typically earns 2-8% APY during normal markets. ETH and BTC lending earns 0.5-3% APY. Rates spike during high-demand periods.
Can I lose money depositing in DeFi lending protocols?
Yes, in several ways: smart contract exploits can drain funds, algorithmic interest rate models can result in insufficient liquidity for withdrawals, and in extreme events, protocol insolvency can occur. These risks are why established protocols with billions in TVL and years of security track record are preferred.
Related Terms
DeFi (Decentralized Finance)
DeFi is a category of financial services built on blockchain technology that operates without traditional intermediaries like banks. It includes lending, borrowing, trading, and earning yield through smart contracts.
TVL (Total Value Locked)
TVL (Total Value Locked) is the total amount of cryptocurrency deposited into DeFi protocols. It measures the size and health of a DeFi ecosystem — higher TVL generally indicates more trust and activity.
Liquidation
In crypto, liquidation is the forced closure of a leveraged trading position when losses reach the deposited margin. The exchange sells your position automatically to prevent further losses beyond your collateral.
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