# Fixed APY (in METIS chain)

**APY** stands for Annual Percentage Yield. This measures the real rate of return on your principal tokens amount by taking into account the effect of compounding interest.

In this case, your $APHR tokens represent your principal, and the compound interest is added periodically on every rebase (which is every 30 minutes).  

Your new principal amount is your pre-rebase $APHR token amount plus the new rebase tokens you earned.

**The Magic of Compound Interest** : One interesting fact about APY  is that your balance will grow not linearly but exponentially over time! \
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**For Example**: If you start with a balance of **100 $APHR on day 1,** after a year, your balance will grow to about **300,001** **$APHR**<mark style="color:green;">**.**</mark>&#x20;


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