The term APY stands for Annual Percentage Yield, and is used to describe the interest rate earned on an investment over a one-year period. In the cryptocurrency context, APY is used to express the interest rate earned on a cryptocurrency investment, such as Bitcoin, over a one-year period. For example, if you invested 1 ETH at an APY of 10%, you would earn 0.1 ETH in interest over the course of one year.