Safe-haven yen, dollar firm with markets on edge before US payrolls test

The Japanese yen and U.S. dollar remained strong as investors sought safety following a significant sell-off on Wall Street. Soft U.S. manufacturing data raised concerns about the economy, with traders eyeing crucial payroll data due Friday. The yen gained 0.1% against the dollar, while the Aussie dollar saw little change after a 1.2% drop.