Most Asian currencies and USD were little changed on Tuesday, with USD Index up 0.1% in Asian session.
Traders brace for President Trump's 8 p.m. ET deadline for Iran to reopen Strait of Hormuz, after Tehran rejected a U.S.-backed ceasefire.
Indian rupee rose 0.3% ahead of RBI's upcoming interest rate decision, while yen flat, won down 0.3%, yuan down 0.1%.
Markets await US March CPI, expected to jump to 3.4% from 2.4% due to higher fuel prices, and U-Mich consumer sentiment report.