The national currency of Sunilia is the SUN /S/. The Sun is a currency in base 6, so the smallest denomination of Suns that can be paid are 6 /S/, and then 12, 18, 24 /S/ and so on.
Exchange rate (February 26th, 2019):
1 € = 18 /S/
1 USD = 15.84 /S/
1 Yen = 0.142 /S/
1 Pound Sterling = 20.88 /S/