What Is APR vs. APY in DeFi? The Difference That Affects Your Real Returns
APY looks much better than APR for the same investment — because compounding. Learn what each means, how to convert between them, and how DeFi protocols use this to present returns.
Two numbers that describe the same investment very differently
When you browse Solana DeFi protocols looking at yield opportunities, you'll encounter both APR and APY — sometimes on the same page, sometimes used interchangeably, sometimes presenting very different numbers for what appears to be the same strategy. Understanding the precise mathematical difference between them — and how protocols use (or exploit) this difference in their marketing — is practical knowledge that prevents you from overestimating the returns you'll actually receive.
APR: Annual Percentage Rate
APR is the simple annualized return on an investment, calculated without accounting for the effect of compounding. If you earn 1% per month on a DeFi position, the APR is simply 1% × 12 = 12% per year.
APR answers the question: if I earn this rate every period and don't reinvest my earnings, what percentage of my principal will I earn over a year?
APY: Annual Percentage Yield
APY is the effective annualized return when earnings are compounded — reinvested back into the position to earn additional yield. The formula:
APY = (1 + periodic rate)^n − 1
Example: earning 1% per month, compounded monthly: APY = (1 + 0.01)^12 − 1 = 12.68%
The same 1% monthly rate that is 12% APR is 12.68% APY. The difference is the compounding effect — each month's earnings earn additional yield in subsequent months.
Why the difference matters in DeFi
At low interest rates (10–15% annually), the APR/APY difference is small. At the high rates common in DeFi, it becomes significant:
| APR | Compounding frequency | APY |
|---|---|---|
| 100% | Daily | 171.5% |
| 100% | Weekly | 168.3% |
| 100% | Monthly | 161.3% |
This is why DeFi protocols almost universally advertise APY rather than APR — at the rates common in new protocol launches, APY can be 50–100% higher than APR for the same underlying strategy.
The compounding assumption problem
APY assumes you are actively compounding your returns. In practice, DeFi compounding requires: manually claiming rewards and reinvesting them, paying transaction fees every time you compound, the reward token maintaining its price, and the APR itself remaining constant (rates change constantly based on pool conditions).
Practical guidance
When evaluating a DeFi yield opportunity on Solana:
- Identify whether the displayed rate is APR or APY
- If APY: calculate the APR to understand the base rate without compounding assumptions
- Assess whether you will actually compound, and at what frequency
- Factor in transaction costs for compounding
- Determine whether yield is paid in stable assets or in a protocol token whose price may decline
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