APR stands for Annual Percentage Rate, which is the interest rate charged over a year. However, in your case, it's applied for just 3 days.

To break it down:

- 30% APR for 1 year would mean you'd earn 30% interest over 365 days.

- For 3 days, the interest rate would be:

- 30%/365 (days in a year) = 0.082% per day

- 0.082% per day × 3 days = 0.246% interest for 3 days

So, staking for 3 days with a 30% APR would earn approximately 0.246% interest on your principal amount.

Keep in mind that APR is an annual rate, so it's essential to consider the actual time frame and calculate the effective interest rate for that period to understand the actual return.