The Australian dollar is the official currency of Nauru. Credit cards are seldom accepted; cash purchases are the norm. Nauru has no exchange offices, and the sole bank, Bank of Nauru, is generally closed. However, in April 2015, the Capelle & Partner established the island’s first ATM. You should still carry enough Australian dollars to cover your expenses throughout your trip.
On Nauru, there is no bargaining or tipping.