The safe-haven dollar and yen fell on Monday after China announced its most sweeping economic and social reforms in nearly three decades, boosting investor appetite for higher-yielding currencies such as the Australian and New Zealand dollars.
Chinese shares posted their biggest gain in more than two months on Monday, while global shares hit their highest levels since the start of 2008.
"Risk appetite is strong...after details of China's reform prove more dramatic than expected, suggesting a focus on market liberalization and reforms in both the government role and the broader corporate structure," said Camilla Sutton, chief currency strategist, ScotiaBank in Toronto.
The dollar index, which gauges the greenback's value against a basket of currencies, slipped 0.2 percent to 80.68, pushing the euro 0.2 percent higher to $1.3522.
The euro received some support after data showed the euro zone's trade surplus grew more than expected in September.
The Australian dollar rose as well, up 0.3 percent at US$0.94, while the New Zealand dollar gained 0.3 percent to US$0.8369.