At time of typing (October 2022) all financial transactions are in Australian Dollars (AUD$), and AUD$1.00 is equivalent to USD$0.64. Or if you prefer, USD$1.00 = AUD$1.55.
This reflects the fact that we're an Australian-registered company.
In the future, it's likely that we'll move to USD as our base currency, because most people have a better idea of exchange rates between their local currency and US dollars.