Key Takeaways
- Crypto lending allows you to earn interest on holdings or borrow against them
- CeFi platforms offer convenience but carry counterparty risk (as Celsius and BlockFi showed)
- DeFi lending is transparent and self-custodial but has smart contract risks
- Interest rates vary significantly by platform, asset, and market conditions
- Never lend more than you can afford to lose; no yield is guaranteed
Critical Warning: Learn from History
In 2022, major CeFi lenders including Celsius, BlockFi, Voyager, and Genesis collapsed, resulting in billions in customer losses. Many users who deposited funds for yield lost everything. This guide explains how these failures happened and how to reduce your risk, but understand that all lending carries significant risk of total loss.
What Is Crypto Lending?
Crypto lending connects lenders (who want to earn interest on their holdings) with borrowers (who want to access liquidity without selling their crypto). It works similarly to traditional lending, but operates either through centralized companies (CeFi) or decentralized protocols (DeFi).
As a lender, you deposit cryptocurrency and receive interest payments. As a borrower, you provide collateral (usually more valuable than the loan) and pay interest to access funds.
CeFi vs DeFi Lending
The fundamental distinction in crypto lending is between centralized finance (CeFi) and decentralized finance (DeFi). Each has distinct advantages and risks.
| Aspect | CeFi Lending | DeFi Lending |
|---|---|---|
| Custody | Platform holds your assets | You retain custody via smart contracts |
| Transparency | Limited visibility into reserves | Fully auditable on-chain |
| KYC Required | Yes, typically extensive | No |
| Primary Risk | Counterparty/insolvency risk | Smart contract risk |
| User Experience | Simpler, app-like interface | Requires wallet management |
| Insurance | Sometimes claimed, rarely paid | Optional cover protocols available |
The CeFi Lending Collapse: What Happened
Understanding what went wrong with CeFi lending in 2022 is essential for anyone considering crypto lending today.
Celsius Network
Celsius offered high yields (up to 18% APY) on crypto deposits and grew to manage over $20 billion in assets. In June 2022, it froze all withdrawals and subsequently filed for bankruptcy. Investigations revealed:
- Customer deposits were used for risky investments including uncollateralized loans to hedge funds
- The company was insolvent for years before the freeze
- Yield was paid partially from new deposits (characteristics of a Ponzi scheme)
- Customers are still awaiting partial recovery of funds through bankruptcy proceedings
BlockFi
BlockFi was considered one of the more reputable CeFi lenders, backed by major venture capital firms. It collapsed shortly after FTX (which had bailed it out) failed. BlockFi had:
- Significant exposure to Three Arrows Capital (3AC), which defaulted on loans
- Became dependent on FTX for a bailout loan
- Filed for bankruptcy in November 2022
- Users have recovered partial funds through bankruptcy, with proceedings ongoing
Lessons Learned
Red Flags to Watch For
- Unsustainable yields: If rates are significantly higher than competitors, ask how
- Lack of transparency: Reluctance to share proof of reserves or audit results
- Aggressive growth: Platforms prioritizing user acquisition over sustainable operations
- Complex corporate structures: Multiple entities across jurisdictions can obscure risk
- Related-party transactions: Lending to affiliated entities creates conflicts of interest
DeFi Lending Platforms
DeFi lending protocols operate through smart contracts on blockchains, primarily Ethereum. Major platforms include:
Aave
One of the largest DeFi lending protocols by total value locked. Aave supports multiple chains including Ethereum, Polygon, Arbitrum, and Optimism. Features include:
- Variable and stable interest rate options
- Flash loans (uncollateralized loans repaid within one transaction)
- Safety module for protocol insurance
- Governance via AAVE token
Compound
Pioneer of the lending pool model that most DeFi protocols now use. Compound operates primarily on Ethereum and offers:
- Algorithmic interest rates based on supply/demand
- cToken system representing deposits
- COMP governance token distribution to users
MakerDAO
Unique model where users mint DAI stablecoin against collateral rather than borrowing existing assets. Key features:
- Self-issued stablecoin (DAI) rather than borrowing from liquidity pools
- Multiple collateral types accepted
- Stability fees function as interest
- MKR token for governance
Current Interest Rates
Interest rates in crypto lending fluctuate based on market conditions, supply/demand for each asset, and platform-specific factors. As of early 2026, typical ranges are:
| Asset | DeFi Supply APY | DeFi Borrow APY |
|---|---|---|
| USDC / USDT | 3-8% | 5-12% |
| ETH | 1-4% | 3-7% |
| BTC (wrapped) | 0.5-2% | 2-5% |
| DAI | 4-9% | 6-12% |
Rates are indicative and change frequently. Check current rates on protocol interfaces.
Risks of Crypto Lending
All crypto lending carries significant risks. Understanding these is essential before committing funds.
CeFi-Specific Risks
- Counterparty risk: Platform insolvency means loss of deposits (see Celsius, BlockFi)
- Lack of transparency: You cannot verify how your funds are being used
- Regulatory action: Platforms may freeze funds due to legal issues
- Terms of service: Your deposits may legally become platform property
DeFi-Specific Risks
- Smart contract risk: Bugs or exploits could drain protocol funds
- Oracle manipulation: Price feed attacks can cause improper liquidations
- Governance attacks: Malicious proposals could harm depositors
- Liquidity crises: During extreme market conditions, withdrawals may be delayed
Universal Risks
- Market risk: Value of deposited assets can decline significantly
- Liquidation risk: Borrowers face liquidation if collateral value drops
- Interest rate volatility: Rates can change dramatically
- Regulatory uncertainty: Legal status of crypto lending is evolving
Risk Management Rules
- Never lend more than you can afford to lose entirely
- Diversify across multiple protocols if lending significant amounts
- Prefer DeFi protocols with long track records and multiple audits
- Be skeptical of yields that seem too good to be true
- Monitor your positions regularly, especially during market volatility
How to Lend on DeFi (Step by Step)
If you decide to proceed with DeFi lending, here is a basic process using Aave as an example.
Step 1: Set Up a Wallet
You need a non-custodial wallet like MetaMask. See our wallet security guide for setup instructions. Fund your wallet with the asset you want to lend plus ETH for gas fees.
Step 2: Access the Protocol
Navigate directly to the official protocol website (e.g., app.aave.com). Verify the URL carefully to avoid phishing sites. Connect your wallet when prompted.
Step 3: Supply Assets
Select the asset you want to supply from the list. Enter the amount and approve the transaction. You will receive aTokens (or equivalent) representing your deposit.
Step 4: Monitor Your Position
Your deposit earns interest continuously. Monitor current rates and protocol health. Interest is reflected in your aToken balance, which grows over time.
Step 5: Withdraw
When you want to exit, return to the protocol and withdraw your assets. You will receive your original deposit plus accrued interest (minus gas fees).
Borrowing Against Crypto
Borrowing allows you to access liquidity without selling your crypto holdings. This can be useful for avoiding taxable events or maintaining long-term positions while accessing short-term funds.
How Borrowing Works
- Deposit collateral (e.g., ETH) into a lending protocol
- Borrow against that collateral up to the loan-to-value (LTV) limit
- Pay interest on the borrowed amount
- Repay the loan to unlock your collateral
Liquidation Risk
If your collateral value drops below the required threshold, your position may be liquidated. For example, if you borrow $5,000 against $10,000 of ETH collateral and ETH drops 60%, your collateral would be worth only $4,000. The protocol would sell your ETH to repay the loan, and you would lose a significant portion of your collateral.
Pro Tip
If borrowing against crypto, maintain a conservative LTV ratio (below 50%) to provide buffer against market volatility. Monitor your health factor regularly, especially during market downturns. Set up alerts to notify you if your position approaches liquidation threshold.