The Bank of Japan has managed to preserve relative stability in financial markets following its policy announcement, with the yen trading within a historically narrow range.

The daily trading band for the dollar-yen pair was a mere 0.43 yen on Tuesday, marking the smallest fluctuation on a BoJ decision day since January 2021. Japanese government bond yields saw a modest increase, while the Nikkei 225 index briefly surpassed the 70,000-point milestone for the first time.

On Wednesday morning in Tokyo, the dollar continued to trade above 160 yen, hovering near levels that prompted intervention by Japan's Ministry of Finance in late April to support the currency. Given this critical threshold, market participants remain watchful for potential renewed intervention, especially as Finance Minister Shunichi Suzuki has repeatedly stated his team is prepared to act again if necessary.

"In light of continued verbal intervention from Japanese Ministry of Finance officials, many investors remain cautious about the risk of actual foreign exchange intervention," noted strategists Koichi Sugisaki and Hiromu Uezato of Morgan Stanley MUFG Securities in a report. "Consequently, we continue to anticipate dollar-yen will trade within a range."

The market's placid response has provided some relief to Bank of Japan officials, even as risks of currency intervention and the upcoming Federal Reserve decision loom. The central bank raised its benchmark interest rate to its highest level since 1995 and outlined plans to halt the reduction of its bond purchases, moves that aligned with widespread market expectations.