Crypto Lending and Borrowing Explained
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Putting Your Crypto to Work
One of the most powerful innovations in DeFi is the ability to earn interest on your crypto — or borrow against it without selling.
Crypto lending and borrowing has opened up a new world of financial possibilities. But like all DeFi, it comes with risks that need to be understood before diving in.
What Is Crypto Lending?
Crypto lending allows you to deposit your crypto into a protocol and earn interest — similar to a savings account, but for crypto.
How It Works:
1. You deposit crypto into a lending protocol (e.g. Aave, Compound)
2. Borrowers take out loans from the pool
3. They pay interest
4. You receive a portion of that interest as yield
It’s fully automated by smart contracts — no bank, no relationship manager, no paperwork.
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What Is Crypto Borrowing?
Crypto borrowing allows you to use your crypto as collateral and borrow other assets — without selling your crypto.
Why Would You Borrow?
Tax efficiency: Selling crypto triggers a taxable event. Borrowing against it doesn’t — you keep your exposure while accessing liquidity.
Leverage: Borrow stablecoins, buy more crypto, amplify your position.
Short-term liquidity: Need cash without selling your Bitcoin? Borrow stablecoins against it.
How Collateralised Borrowing Works
Crypto loans are overcollateralised — you must deposit more value than you borrow. This protects the protocol since crypto prices fluctuate.
Example:
– You deposit £1,000 of ETH as collateral
– You can borrow up to £700 of USDC (70% LTV — Loan-to-Value ratio)
– If ETH’s price drops, your LTV rises
– If it rises too high, your collateral is liquidated to repay the loan
Key Terms:
| Term | Meaning |
|---|---|
| Collateral | The asset you deposit to secure the loan |
| LTV (Loan-to-Value) | Loan amount ÷ collateral value |
| Liquidation Threshold | LTV level at which your collateral is sold |
| Health Factor | How safe your position is (>1 = safe) |
| APR | Annual interest rate on borrowed funds |
| APY | Annual yield on deposited funds |
Major Lending Protocols
Aave
The largest decentralised lending protocol. Supports dozens of assets across multiple chains.
Features:
– Variable and stable interest rates
– Flash loans (uncollateralised loans in a single transaction)
– Multi-chain: Ethereum, Polygon, Arbitrum, Avalanche, Optimism
Compound
One of the original DeFi lending protocols. Simpler interface than Aave.
MakerDAO
Borrow DAI stablecoin against ETH and other collateral. One of the most battle-tested protocols in DeFi.
Morpho
Optimises yields for both lenders and borrowers by matching them peer-to-peer on top of existing protocols.
Centralised Lending (CeFi)
Before DeFi, centralised platforms offered crypto lending:
– BlockFi, Celsius, Nexo: Paid interest on deposited crypto
The risks were catastrophic. BlockFi and Celsius both collapsed in 2022, losing billions of customer funds. When you lend to a centralised platform, you are an unsecured creditor — if they go bankrupt, you may lose everything.
The lesson: DeFi lending with transparent smart contracts is, paradoxically, often safer than centralised platforms, despite its complexity.
Understanding Liquidation
Liquidation is the most important risk to understand in crypto borrowing.
When does liquidation happen?
If the value of your collateral drops enough that your LTV exceeds the liquidation threshold, bots automatically sell your collateral to repay the loan.
Example:
– You deposit 1 ETH (worth £2,000) and borrow £1,200 USDC (60% LTV)
– Liquidation threshold is 80% LTV
– ETH drops to £1,500 → LTV is now 80% → liquidation triggered
– Your ETH is sold, you keep the USDC but lose your collateral
How to avoid liquidation:
– Keep your LTV well below the threshold (stay at 50% or below)
– Monitor your position regularly
– Set price alerts on your collateral asset
– Add more collateral if prices drop
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Flash Loans: The Most Exotic DeFi Tool
A flash loan is a loan with no collateral — as long as it’s repaid within the same blockchain transaction.
If the repayment isn’t included in the transaction, the entire thing reverts — as if it never happened.
Uses:
– Arbitrage: Borrow funds, exploit a price difference, repay the loan, keep the profit
– Collateral swaps: Swap your loan collateral without closing the position
– Liquidations: Borrow funds to liquidate a position, collect the bonus, repay
Flash loans require smart contract programming to use — they’re not for beginners.
Risks of Crypto Lending and Borrowing
- Liquidation risk: Your collateral can be sold if prices move against you
- Smart contract risk: Protocol bugs have led to hundreds of millions in losses
- Interest rate risk: Variable rates can spike during high demand
- Oracle manipulation: Price feed attacks can trigger false liquidations
- CeFi platform failure: Centralised lenders can go bankrupt (Celsius, BlockFi)
Key Takeaways
– Crypto lending lets you earn interest by depositing assets into a protocol
– Crypto borrowing lets you access liquidity without selling your crypto
– All DeFi loans are overcollateralised — you borrow less than your collateral value
– Liquidation occurs if your collateral value drops too far — monitor positions carefully
– DeFi protocols (Aave, Compound) are generally more transparent than centralised lenders
– Flash loans are uncollateralised but must be repaid in the same transaction
The Bottom Line
Crypto lending and borrowing is one of the most powerful tools in DeFi — but it requires discipline and active risk management. Keep your LTV conservative, monitor your positions, and never borrow more than you can afford to repay even if markets move against you.
Used wisely, it’s a genuine superpower. Used carelessly, it’s a fast track to liquidation.
NOT FINANCIAL ADVICE. DeFi lending and borrowing carries significant risks including liquidation and smart contract exploits. Always do your own research (DYOR).
