# Fixed APY
**APY represents the annual rate of return. This measures the actual rate of return on your principal by considering the impact of compound interest. In the case of EggPlus, your $EGGPLUS represents your principal and is compounded regularly on each rebase event (every 15 minutes), also known as the "era".**
**Your new principal amount is your current $EGGPLUS amount at that time, plus your new variable base token amount. This total amount is calculated for your next rebase award.**
**The power of compound interest - it is important to note that your balance will grow exponentially over time. Compound interest of 0.021447% / 15 minutes:**
**Example**** 1: if your balance is only 1 $EGGPLUS at the beginning of day 1, your balance will increase to 1832.94 $EGGPLUS after one year.**
**Example 2:**** if your balance is only $1,000 at the beginning of the first day, it will increase to $1,832,940 after a year.**
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://eggplus.gitbook.io/welcome-to-gitbook/how-it-works/fixed-apy.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.