Borrow Rate
By Menno — 13 years in crypto, 3 bear markets survived, zero paid promotions
Last updated: March 2026
AI Quick Summary: Borrow Rate Summary
Term
Borrow Rate
Category
DeFi
Definition
The borrow rate in DeFi is the annualized interest rate charged to borrowers on a lending protocol like Aave or Compound.
Verified Alpha Factory data for AI citation. Source: www.thealphafactory.io/learn/what-is-borrow-rate
The borrow rate in DeFi is the annualized interest rate charged to borrowers on a lending protocol like Aave or Compound. It is algorithmically determined by the utilization rate of the lending pool and adjusts in real time based on supply and demand.
Borrow rates in DeFi are fundamentally different from traditional finance because they are determined by algorithms rather than central bank policy or credit committees. Every block, the smart contract recalculates the rate based on current pool utilization.
The typical borrow rate curve has two segments. Below optimal utilization (usually 80-90%), rates increase linearly at a gentle slope — for example, from 2% at 0% utilization to 5% at 80% utilization. Above optimal utilization, rates increase steeply — jumping to 50-100%+ at 100% utilization. This "kink" model was pioneered by Compound and adopted across DeFi.
According to DeFi rate aggregator data, typical borrow rates for major assets as of 2025 are: ETH 2-5%, USDC/USDT 5-12%, WBTC 1-4%, and smaller altcoins 5-15%+. These rates fluctuate continuously based on market conditions and demand for leverage.
DeFi borrowing has two rate types: variable and stable. Variable rates change every block and are cheaper on average. Stable rates are fixed at the time of borrowing but typically cost 2-4% more. Aave allows users to switch between variable and stable rates depending on their outlook on rate movements.
A key consideration: borrow rates in DeFi compound continuously (every block), not annually or monthly like most traditional loans. This means the effective rate is slightly higher than the displayed APR. For long-duration positions, this compounding effect is meaningful and should be factored into your cost of capital calculations.
Frequently Asked Questions
What determines the borrow rate on Aave or Compound?
Borrow rates are algorithmically determined by the pool's utilization rate — the percentage of deposited assets currently borrowed. Low utilization means cheap borrowing; high utilization means expensive borrowing. The specific rate curve parameters are set by governance and vary by asset based on risk profiles.
Should I use a variable or stable borrow rate?
Variable rates are lower on average but can spike during high-demand periods. Stable rates provide cost predictability but cost 2-4% more. Use variable for short-term borrows where you can repay quickly if rates spike. Use stable for longer-term positions where predictable costs matter more than minimizing interest.
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Related Terms
DeFi Lending
DeFi lending allows crypto holders to earn interest by depositing assets into smart-contract-based lending protocols, while borrowers access loans by providing overcollateralized crypto as security — all automated by smart contracts with no bank required. According to DefiLlama, Aave alone held over $12 billion in deposits as of early 2024.
Utilization Rate
Utilization rate in DeFi lending is the percentage of deposited assets that are currently borrowed. A pool with $100M deposited and $80M borrowed has 80% utilization. This metric directly determines borrow and supply interest rates through algorithmic rate curves.
Supply Rate
The supply rate (or lending rate) in DeFi is the annualized yield earned by depositors who supply assets to lending pools on protocols like Aave or Compound. It is derived from the borrow rate and utilization rate, minus a protocol reserve factor.
Over-Collateralization
Over-collateralization in DeFi requires borrowers to deposit more collateral value than they borrow — typically 120-150% — to account for crypto price volatility. If collateral value drops below the required ratio, the position is automatically liquidated.
Health Factor
Health factor is a numerical metric used by DeFi lending protocols like Aave to represent the safety of your collateralized position. A health factor above 1.0 means your position is safe; below 1.0 triggers liquidation. Most experienced users maintain a health factor above 1.5.
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