Crypto glossary

Utilization Rate

The utilization rate is the share of a lending pool's deposits that is currently borrowed. It drives interest rates in most DeFi lending protocols and tells lenders how easily they can withdraw.

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How utilization is calculated

In a lending protocol, lenders deposit an asset such as USDC into a pool and borrowers take loans from it against collateral. Utilization is total borrowed divided by total supplied. If a pool holds 10 million USDC in deposits and 7 million is lent out, utilization is 70%. The 3 million that remains is the cash available for new loans and for lenders who want to withdraw.

Why it sets the interest rate

Most protocols use an interest rate curve tied to utilization. When little is borrowed, borrowing is cheap. As utilization rises, the borrow rate climbs. Many designs, including those used by Aave and Compound, have a kink, an optimal utilization level above which rates rise much more steeply. The goal is to pull utilization back down by making loans expensive and deposits attractive.

Lenders earn roughly the borrow rate multiplied by utilization, minus a reserve factor the protocol keeps. So the same pool pays lenders more when more of it is borrowed.

An example

Say a pool has 10,000,000 USDC supplied, 8,000,000 borrowed, and a borrow rate of 6% per year. Borrowers pay about 480,000 USDC a year. Spread over all 10,000,000 supplied, that is 4.8%, and after a 10% reserve factor lenders earn about 4.3%. If borrowing jumps to 9,500,000, utilization reaches 95%, the curve may push borrow rates sharply higher, and only 500,000 USDC is left for withdrawals.

Risks for lenders

At or near 100% utilization, lenders cannot withdraw because the money is lent out. They have to wait until borrowers repay or are liquidated, or until new deposits arrive. High rates usually fix this quickly, but in a market panic or a depeg of the collateral it can last longer, and that is exactly when lenders want their money back.

Before depositing, check the current and historical utilization, the shape of the rate curve and how much liquidity is available relative to your deposit. A very high deposit rate often signals high utilization, which is a liquidity warning as much as an opportunity.

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Frequently asked questions

What is a good utilization rate?

There is no single number. Protocols set an optimal level per asset; below it rates are stable, above it rates rise steeply and withdrawals can become harder.

Why can't I withdraw from a lending pool?

Probably because utilization is at or near 100%, so almost all deposits are lent out. Funds become available again as borrowers repay or new lenders deposit.

Why do lenders earn less than borrowers pay?

Interest is paid only on the borrowed part but shared across all deposits, and the protocol usually keeps a reserve factor as a buffer.

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All glossary terms · Educational reference only — not investment, legal, tax or financial advice.