Investors are eyeing this week's Federal Reserve meeting but in the meantime the dollar has slipped against a basket of currencies, while cryptocurrencies have surged to their highest levels in weeks.

Before the publication of the Ifo business climate index in Germany, the euro rose 0.3% to 1.1797 dollars. The yen also gained 0.4% to 110.11 yen per dollar. For its part, cryptocurrency bitcoin jumped 10% to a more than five-week high of $39,850, while ether gained 7.35% to $2,353 after City AM newspaper reported. London quoted an anonymous "insider" over the weekend as saying that Amazon plans to accept bitcoin payments by the end of the year. The dollar index, which measures the currency against the six major currencies, slipped slightly to 92.833 on pressure from the euro and yen, but remained close to the high of 93.194 hit last week in three and a half months. It has gained nearly 4% from its May 25 low as the improving US economy has boosted the prospect that the Fed will begin to scale back its asset purchases as early as this year. Meanwhile, MSCI's index of Asia-Pacific stocks excluding Japan fell 2% on Monday, while Chinese blue chip stocks lost 3.8%.