Crypto lending and borrowing let you put your crypto to work or get access to cash without selling your holdings.
Lending = Deposit crypto, earn interest. Lenders earn passive income. Borrowing = Deposit collateral, borrow stablecoins. Borrowers get liquidity without selling.
How Lending Works
You deposit crypto into a lending protocol (Aave, Compound, Morpho). The protocol lends your crypto to borrowers. You earn interest.
Supply Rates (What You Earn)
| Asset | Typical APY |
|---|---|
| USDC | 5-12% |
| DAI | 5-12% |
| ETH | 1-3% |
| WBTC | 0.5-2% |
Stablecoins (USDC, DAI) earn the highest rates because there’s high demand for borrowing them.
How Interest Is Calculated
Interest rates are dynamic — they change based on utilization rate (how much of the pool is borrowed).
- Low utilization (30%) = low rates (2-4%)
- High utilization (80%) = high rates (8-15%)
- Max utilization (100%) = very high rates (20%+, but no one can withdraw)
Lending Risks
- Smart contract risk — A bug in the protocol could freeze or lose funds
- Liquidation risk — Doesn’t affect lenders directly, but affects pool health
- Opportunity cost — Your crypto is locked in the protocol
- Interest rate volatility — Rates change constantly
How Borrowing Works
You deposit crypto as collateral and borrow stablecoins against it. You get liquidity without selling your crypto.
How Much Can You Borrow?
The amount depends on your loan-to-value ratio (LTV):
| Asset | Max LTV | Liquidation Threshold |
|---|---|---|
| ETH | 80% | 83% |
| WBTC | 75% | 80% |
| USDC | 80% | 85% |
Example:
- You deposit $10,000 ETH
- Max LTV is 80% → you can borrow up to $8,000 USDC
- If ETH drops to $9,638, your LTV hits 83% (liquidation threshold)
- Your position gets liquidated — the protocol sells your ETH to repay the loan
Borrow Rates (What You Pay)
| Asset | Typical Borrow APY |
|---|---|
| USDC | 6-15% |
| DAI | 6-15% |
| ETH | 2-5% |
Borrow rates are higher than supply rates — the difference is the protocol’s profit.
Why People Borrow Against Crypto
1. Avoid Taxable Events
Selling crypto triggers capital gains tax. Borrowing doesn’t. You get cash without selling.
Example: You have $100K in Bitcoin. You need $20K for a car. Instead of selling (taxable), you deposit BTC as collateral and borrow $20K USDC. No tax event.
2. Leverage
Borrow USDC, buy more ETH. If ETH goes up, you profit on the borrowed amount too.
Risk: If ETH drops, you get liquidated and lose everything.
3. Liquidity Without Selling
You believe in a coin long-term but need short-term cash. Borrow against it instead of selling.
Liquidation Explained
If your collateral value drops below the liquidation threshold, the protocol liquidates your position.
How it happens:
- You deposit $10K ETH, borrow $7K USDC (70% LTV — safe)
- ETH drops 20% → your collateral is now $8K
- LTV = $7K / $8K = 87.5%
- Liquidation threshold (83%) is breached
- Liquidator repays your loan + gets a bonus from your collateral
- You lose your ETH and your borrowed USDC is gone
How to avoid liquidation:
- Keep LTV below 50% (deposit $10K, borrow less than $5K)
- Monitor your position regularly
- Add more collateral if the price drops
- Repay some of the loan to reduce LTV
Lending vs Borrowing: Which Should You Do?
Lend If You:
- Hold stablecoins (USDC, DAI)
- Want passive income without price risk
- Are OK with variable interest rates
- Want the safest DeFi strategy
Borrow If You:
- Need cash but don’t want to sell crypto
- Understand liquidation risk
- Keep LTV below 50%
- Have a clear repayment plan
Major Lending Protocols
| Protocol | Chains | Key Feature |
|---|---|---|
| Aave | Ethereum, Arbitrum, Base, Polygon | Largest, most liquid, variable + stable rates |
| Compound | Ethereum, Base | Second largest, easy to use |
| Morpho | Ethereum, Base | Optimized rates (better than Aave/Compound) |
| JustLend | TRON | High rates on TRON ecosystem |
| Spark | Ethereum, Gnosis | Based on MakerDAO, DAI-focused |
Step-by-Step: Lend on Aave
- Go to app.aave.com
- Connect your wallet (MetaMask on Arbitrum or Base for low fees)
- Select “Supply” — choose USDC or DAI
- Enter the amount — approve and confirm
- Done — you start earning interest immediately
- Withdraw anytime — click “Withdraw” to get your crypto back
Step-by-Step: Borrow on Aave
- Supply collateral first — deposit ETH or USDC
- Go to “Borrow” — choose USDC or DAI
- Check the LTV — don’t borrow more than 50% of your collateral
- Confirm — the borrowed stablecoins appear in your wallet
- Monitor your position — use the dashboard to track LTV
- Repay — deposit borrowed stablecoins back to close the position
Verdict
Lending is one of the safest ways to earn passive income on your crypto. Deposit stablecoins on Aave, earn 5-12% APY, and benefit from compound interest.
Borrowing is useful for accessing liquidity without selling, but carries liquidation risk. Only borrow if you understand the risks and keep LTV well below the threshold.
For beginners: start with lending. Deposit $100 USDC on Aave to learn the process. Add more once you’re comfortable.
Related: How to Earn Interest on Crypto | What Is DeFi? | 10 Ways to Earn Passive Income | What Is a Liquidity Pool?
How to start lending on Aave
The process is straightforward and takes about ten minutes. Start with a small test deposit — $50 in USDC — so you understand the interface before committing larger amounts.
- Go to app.aave.com and connect your wallet. MetaMask on Arbitrum or Base keeps transaction fees under $1 per deposit.
- Select “Supply” and choose USDC or DAI. Stablecoins earn the highest supply rates because borrowing demand for them is consistently strong.
- Approve and confirm the transaction. You will see your deposit reflected in the dashboard immediately, and interest accrues every Ethereum block — roughly every 12 seconds.
- Monitor the dashboard. Your supplied balance grows in real time. The APY shown is variable and will shift as pool utilisation changes.
- Withdraw when ready. Click “Withdraw” to pull your funds back to your wallet. There is no lock-up period on most Aave markets.
Mistakes that cost beginners money in DeFi lending and borrowing
The most expensive mistake is ignoring the utilisation rate. When a pool reaches 100% utilisation, no one can withdraw — all the deposited assets are lent out. If you need your USDC back urgently and the pool is maxed out, you are stuck until borrowers repay. Check utilisation before depositing and avoid pools above 90%.
Borrowers who ignore the liquidation threshold learn the hard way. A 30-40% market crash is common in crypto. If your LTV is at 75% when a crash hits, you will be liquidated within minutes. The safer approach is to borrow no more than 30-40% of your collateral value and keep extra funds available to add as collateral during downturns.
Gas fees on Ethereum mainnet can eat into small positions. A $100 deposit on Ethereum mainnet might cost $5-20 in gas per transaction (deposit + withdraw). Using Arbitrum, Base, or Polygon reduces these fees to pennies. For deposits under $1,000, a Layer 2 network is almost always the better choice.
Resources for learning more
The Aave documentation is thorough and well-maintained — start with the “Getting Started” section on docs.aave.com to understand how interest rate models and health factors work. Compound’s documentation is equally detailed at docs.compound.finance.
For understanding liquidation mechanics in depth, the MakerDAO documentation explains collateralised debt positions in a way that transfers directly to Aave and Compound. If you are considering borrowing against volatile assets, read about the history of DeFi liquidation cascades — the March 2020 and May 2021 crashes are instructive case studies of what happens when collateral values drop rapidly across the entire market.
Related: How to Earn Interest on Crypto | What Is DeFi? | 10 Ways to Earn Passive Income | What Is a Liquidity Pool?