To perform trades, you must ensure your base asset matches the cash balance in your account. Otherwise, you'll need to change your base currency.
You can buy assets with Australian dollars, US dollars, New Zealand dollars, or Bitcoin.
Your cash deposits will arrive in Australian or New Zealand dollars unless you deposit by card using Banxa; in that case, the funds will arrive in US dollars.
How to change your base currency
App
Select the three lines
to expand the side menu and select 
Currency.From the dropdown menu, select the currency you wish to trade and view pricing in.
Web
Select your circled initial in the top right corner of the dashboard and select
Account settings.Select Personalisation in the profile menu.
Under Platform data, in the Currency section, select the currency you wish to trade and view pricing from the drop-down menu.
How do I exchange Australian or New Zealand dollars for US dollars?
Execute an instant order as you would for any other asset on the platform to exchange your base currency (AUD or NZD) for US dollars. You cannot withdraw US dollars.
You will incur an exchange rate and fee when exchanging between base currencies.
Why not just use Australian or New Zealand dollars?
As cryptocurrency is often traded against (pegged to) the US dollar, you are exposed to better spreads when trading with US dollars. However, this comes at the expense of being exposed to currency exchange rate fluctuation.
At times, there may appear to be a discrepancy between profit and loss percentages when toggling between AUD and USD base currencies. This behaviour is expected and is caused by how we calculate profit and loss. When switching base currencies, we calculate percentage gains or losses as though you purchased with that base currency.