Dollar under pressure as oil prices slump, Australia rate decision awaited

The dollar experienced fluctuations alongside oil prices on Tuesday, buoyed by hopes of a US-Iran diplomatic resolution, while the Australian dollar remained stable ahead of the Reserve Bank's decision. Brent crude futures plummeted over 7% on Monday, marking their steepest single-day decline in months, following Iran's claim that ongoing contacts with the US aimed at ending their eight-month conflict.

Lower energy prices alleviated inflation worries and contributed to a decline in longer-dated US Treasury yields, which were relatively flat. The dollar index, representing the currency against key currencies like the yen and euro, briefly weakened to 101.76, after hitting a monthly low on Monday. Sim Moh Siong, an FX strategist at OCBC, noted that while oil relief was improving, support from other sources remained uncertain.

The euro slightly appreciated at $1.1185 due to dollar weakness, while the Japanese yen stayed flat at 157.915 per dollar. Central banks across the globe are expected to release policy statements this week, with the Bank of Australia likely to increase the official cash rate by 25 basis points to 4.85% on Tuesday, the highest level since December 2008.