Bitfinex is a cryptocurrency exchange, which also provides margin trading. Most of the major coins are being traded on Bitfinex. Bitfinex also allows margin trading and shorting coin. The maximum leverage is 1 top 3,3. The functions of Bitfinex are outstanding but they are also a little more advanced then most other exchanges. AUD deposits are not a option for this exchanges so you will need to transfer BTC or other supported coins to you wallet to be able to trade. Fees are low and signing up if a fast process .