The Annual Growth Rate is a bit like the interest rate paid by banks, but we call it a growth rate because the money can’t be turned into cash. It has to be spent with the merchant you’ve created a Hyper Jar with on the app. Your spending power with that merchant grows when you commit money to them.
The AGR is paid daily on the current balance in Hyper Jars. As an example, if you have a balance of £300 in a Hyper Jar with an AGR of 4.8%, at the end of that day your Jar will have grown by 4p to £300.04:
£300 x 4.8% /365 (days of the year) = 4p