DeFi lending protocols let you earn interest on deposited assets or borrow against your crypto holdings without selling them. On Solana, Kamino Finance dominates. On Ethereum and Base, Aave is the standard.
Understanding how these protocols work — and where the risks are — is essential before using them.
How DeFi Lending Works
Lenders deposit assets into a pool. They earn interest paid by borrowers.
Borrowers post collateral (more valuable than what they borrow) and take a loan. Interest accrues on the borrowed amount.
Utilization rate determines interest rates: when most of a pool is borrowed, rates go up (incentivizing more deposits and fewer new borrows). When utilization is low, rates drop.
No credit checks, no identity, no approval. The math governs everything.
Key Concepts
Collateral Factor / LTV
The Loan-to-Value (LTV) ratio determines how much you can borrow against your collateral.
Example: SOL has an 80% LTV on Kamino. Deposit $10,000 of SOL → borrow up to $8,000 USDC.
Lower LTV = safer protocol but less capital efficiency. Blue-chip assets (SOL, ETH, BTC) get higher LTVs. Volatile or illiquid assets get lower ones.
Health Factor
Your position's health is a ratio of collateral value to borrow value. On Kamino, a health factor above 1.0 means you're safe. As collateral value drops (or borrow value increases via interest), health factor falls.
If health factor hits 1.0, your position is eligible for liquidation.
Liquidation
When your collateral value falls too close to your borrow value, liquidators can repay part of your debt in exchange for a portion of your collateral at a discount (the liquidation penalty — typically 5–15%).
This protects the protocol from bad debt but means you can lose a chunk of your collateral if prices move against you.
Avoiding liquidation:
- Maintain a comfortable buffer (health factor > 1.5 preferred)
- Monitor position health — set alerts via Dialect on Solana
- Add collateral or repay debt when prices drop significantly
Earning Interest: The Lending Side
Depositing into lending pools is one of the simpler DeFi yield strategies:
| Asset | Protocol | Approx Supply APY | |---|---|---| | USDC | Kamino (Solana) | 5–12% | | SOL | Kamino | 3–6% | | USDC | Aave (Base) | 4–8% | | ETH | Aave | 2–5% |
Rates float with utilization — they're not fixed. High utilization periods can push USDC supply rates above 20% briefly.
Borrowing Use Cases
Hold exposure, access liquidity: You hold SOL long-term but need USDC for expenses. Borrow USDC against SOL rather than selling. If SOL appreciates, you repay the loan and keep the gain.
Leveraged staking: Deposit SOL → borrow more SOL → stake it as mSOL → deposit mSOL as collateral → repeat. Each loop amplifies staking yield — and liquidation risk. Only for experienced users.
Yield arbitrage: Borrow at 4% → deploy in a strategy yielding 10% → net 6% on the borrowed capital. Works until yields compress or your strategy underperforms.
Risks
Liquidation risk: Collateral price drops faster than you can respond. Use conservative LTV ratios.
Smart contract risk: A vulnerability in the protocol could result in loss of deposited funds. Kamino and Aave are audited and battle-tested, but not zero risk.
Oracle risk: Lending protocols rely on price feeds. Oracle manipulation attacks have drained lending protocols historically. Established protocols use multiple oracle sources.
Interest rate risk: Borrow rates can spike during high utilization (seen 50%+ briefly). If you borrowed expecting 5% and it spikes to 30%, costs mount quickly.
Getting Started on Kamino (Solana)
- Go to app.kamino.finance
- Connect Phantom wallet
- Deposit USDC or SOL into the lending pool to earn supply interest
- Or: deposit collateral → borrow → manage health factor
Start with simple lending (deposit only) before touching borrowing. Understand health factor mechanics before taking your first loan.