ATH Percentage Change
ATH_PERCENTAGE_CHANGE is the drop in percents of the price of a cryptocurrency compared to its maximum price (ATH) of all time.
Suppose there's a cryptocurrency called alphacoin and it reached an ATH price of $1000, which occurred a few months ago. And today, it has a price of $800. This means the price fell by 20% and is now at 80% of the ATH. So, the ATH_PERCENTAGE_CHANGE is -20%.
Today, the bitcoin ATH percentage change is -49% at a price of about $33,000 compared to the ATH of about $64,000.