The BOJ’s announced bond purchase plans bashed the yen, with the dollar fetching as much as 113.83 yen, compared with as low as 113.07 yen earlier in the session.
The dollar/yen pair was at 113.71 at 10:50 a.m. HK/SIN.
The dollar index, which measures the greenback against a basket of currencies, also climbed, rising as high as 95.965, from as low as 95.811. The index was at 95.950 at 10:52 a.m. HK/SIN.
That likely had a knock-on effect on oil, which is priced in dollars.
U.S. light crude futures for August touched a low of $44.64 a barrel, amid the currency moves, trading off a high of $45.42 earlier in the session. The futures were down 1.23 percent at $44.96 a barrel at 10:54 a.m. HK/SIN.
Brent futures for September also fell as low as $47.24 a barrel, from as high as $45.42. The Brent futures were trading down 1.23 percent at $47.52 at 10:57 a.m. HK/SIN.