Fixed Rate
A predetermined interest rate that remains constant for the loan duration. Rare in DeFi but offered by some protocols like Notional Finance and Element Finance.
A fixed rate means you know your number on day one — and it doesn't move. Whether you're borrowing at 6% or lending at 5%, that rate holds for the full term, regardless of what the market does tomorrow.
That predictability is the whole point. Variable rates in DeFi can swing dramatically inside a single day — Aave's USDC borrow rate has moved several percentage points in hours during high-demand periods. A fixed rate trades that uncertainty for a locked-in cost or yield.
How It Works
Most fixed-rate DeFi protocols work through a bond-like mechanism. You commit capital for a defined term — say, 90 days — and receive a fixed yield at maturity. The protocol issues tokenized debt instruments that trade at a discount to face value; the spread between what you pay and what you receive at maturity is your fixed return.
Here's the concrete version: you deposit 1,000 USDC today for a 90-day term at 5% annualized. At maturity, you receive roughly 1,012.50 USDC. That number doesn't change if utilization spikes or rates collapse — you locked it in when you entered the position.
Borrowers use the same structure in reverse. You lock in a fixed borrow rate upfront, which means your repayment cost is known from day one. No surprise rate jumps mid-loan because the market got busy.
Why It Matters
Variable rates work fine when you're watching your position daily. But most people aren't. A borrower who takes out a variable-rate loan at 4% and checks back in three weeks might find they've been paying 14% — and didn't plan for it.
What is Fixed Rate?
A predetermined interest rate that remains constant for the loan duration. Rare in DeFi but offered by some protocols like Notional Finance and Element Finance.
Full glossary entryFixed rates let you model your actual cost of capital. For a borrower using crypto-backed funds to cover a business expense, that matters. For a lender building a predictable income stream, it matters even more.
Bill's Take
In 25 years of mortgage lending, fixed-rate loans were always the product people chose when they needed certainty over optionality. The 30-year fixed isn't the cheapest mortgage — it's the most predictable one. DeFi fixed rates work the same way: you're paying a small premium to eliminate rate risk. Whether that trade-off makes sense depends entirely on how long your position needs to hold and how much rate volatility you can stomach.
What to Watch
Fixed terms mean locked capital. Unlike a variable-rate position you can exit anytime, a fixed-rate deposit ties your funds until maturity. Some protocols let you sell your position on a secondary market before the term ends — but if liquidity is thin, you may take a loss to exit early.
What is Yield?
The return earned on a crypto investment, typically expressed as APY. In crypto lending, yield comes from interest paid by borrowers, protocol incentives, and governance token rewards.
Full glossary entryLiquidity Risk
Early exit is the fixed-rate trap most people miss. If you lock 10,000 USDC into a 180-day fixed-rate position and need that capital on day 60, you're either stuck or selling at a discount. Treat a fixed-rate deposit like a CD: only commit funds you genuinely won't need before maturity.
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