APY (Annual Percentage Yield) and APR (Annual Percentage Rate) are two ways of expressing the return on a DeFi investment or the cost of a loan, and understanding the difference is essential for accurately comparing yields across protocols. APR is the simple annual rate without compounding — if a protocol offers 12% APR, you earn 1% per month, and your total after 12 months on $1,000 is $1,120. APY accounts for compounding — reinvesting earnings so that each period you earn returns on your previous returns. At 12% APR compounded monthly, APY is approximately 12.68%, making $1,000 worth $1,126.80 after a year.
Why the distinction matters in DeFi: many protocols advertise APY to show the higher compounded number; auto-compounding vaults (like those on Beefy Finance or Yearn) genuinely compound your returns automatically, so APY accurately reflects what you earn; manual positions (where you must harvest and reinvest rewards yourself) are more accurately described by APR unless you actively compound. Key caveats: Variable rates — DeFi yields fluctuate constantly based on protocol activity, liquidity, and token prices; the displayed APY/APR is a snapshot, not a guarantee; Token yield vs dollar yield — high APY paid in a volatile reward token may not translate to dollar gains if that token falls; and Impermanent loss — LP yields must be compared net of impermanent loss for a true picture. Always verify whether a displayed rate is APR or APY before committing capital.
Example: A DeFi protocol shows 120% APY on a liquidity pool. This sounds impressive but breaks down to ~6.9% APR monthly. If the reward token drops 50% in value, the real dollar yield is closer to 3.4% monthly — still good but very different from the headline number.
Learn more: Binance Academy — APY vs APR
