The yen strengthened slightly against most G-10 and Asian currencies on Tuesday as traders awaited a speech from BOJ Deputy Governor Himino. Scheduled to meet with local leaders in Saitama, Japan, Himino's address is seen as a key signal for future monetary policy. CBA's Carol Kong noted the speech would help validate or push back against market expectations for a 25bp interest rate hike in September.

Markets are watching for signals on upside inflation risks and the need to avoid falling behind the curve. The U.S. dollar slipped 0.1% to 159.15 yen, while the euro fell 0.1% to Y185.49. The Australian dollar was little changed at Y114.16.