The base currency – AUD. The counter currency – USD. AUD/USD, often referred to as the Aussie, is the among most popular currency pairs represented on the entire Forex market. The Australian dollar is considered to be a very liquid currency as the Australian Forex market is featured in the top ten biggest Forex markets throughout the globe. AUD/USD rate is impacted by the US Federal Reserve and the Federal Bank of Australia. The Australian dollar is positively correlated to the Canadian dollar. The influence is explained by the fact that the two countries have similar economies and export a lot of commodities.