The Beginner's Guide to Solana DeFi: Supply, Borrow, Earn in 10 Minutes

DeFi sounds complicated. It doesn't have to be.

DeFi — decentralized finance — is just banking without the bank. You lend your crypto to earn interest, borrow against your holdings for leverage, or trade without a middleman. On Solana, it costs pennies and takes seconds.

This guide assumes you have a wallet with some SOL. If you don't: install Phantom, buy SOL on a CEX, and send it to your wallet. That's step zero.

Step 1: Supply — earn passive yield (3 minutes)

Supplying assets to a lending protocol is the simplest DeFi action. Think of it as a savings account with better rates.

• Go to app.marginfi.com and connect your wallet.
• Find SOL in the asset list. Click Supply.
• Enter the amount (start with 1-5 SOL) and confirm the transaction.

That's it. Your SOL is now earning yield. You'll see your balance grow in real-time. Current APY on SOL supply: 4-6%.

Your supplied SOL also acts as collateral. This means you can borrow against it — which is step 2.

Step 2: Borrow — use your assets without selling (3 minutes)

Borrowing against your supplied assets lets you access liquidity without selling. You still earn yield on your supply, and you repay the loan whenever you want.

• In the same Marginfi dashboard, find USDC in the Borrow section.
• Check how much you can borrow (your borrowing power is ~70% of your supplied value).
• Borrow a small amount — 10-20 USDC is fine for learning.
• The borrowed USDC appears in your wallet. Use it for anything — trading, spending, or step 3.

Key number: your health factor. Marginfi shows it prominently. Above 2.0 is safe. Below 1.2 is danger zone. Keep it above 2.0 by not over-borrowing.

Step 3: Earn — put your borrowed assets to work (4 minutes)

Now you have borrowed USDC earning 0% in your wallet. Put it to work.

• Open Kamino Finance and connect your wallet.
• Find the USDC vault (auto-compounding).
• Deposit your borrowed USDC. Current APY: 8-12%.

Now you have a three-layer yield: SOL supply yield (4-6%) + USDC vault yield (8-12%) minus USDC borrow cost (6-10%). Net: your SOL is earning more than if you just held it, and you haven't sold anything.

The golden rules for beginners

• Never borrow more than 30% of your supplied value. This keeps your health factor above 2.5.
• Start with stablecoins. Borrowing USDC against SOL is safer than borrowing SOL against a volatile token.
• Check your positions once a week. Solana is fast — a 10% SOL drop can happen in minutes.
• Use Falcontrace to monitor your health factors across all protocols in one view.

DeFi on Solana is the most accessible in crypto. Low fees, fast transactions, and a mature ecosystem of user-friendly protocols. Start with these three steps, get comfortable, and the advanced strategies will come naturally.