USD/JPY stays above 157 after BOJ hike, intervention fears persist

The Bank of Japan raised its policy rate to its highest point in 31 years last week, yet USD/JPY continues to trade near the 157 level after slipping from around 156 before the decision.

This situation highlights the primary source of pressure on the currency pair.

Even though the BOJ increased its policy rate to 1.25%, the move did not spur sustained demand for the yen. Markets had widely anticipated the rate hike, putting the focus on the central bank's statement and Governor Ueda to signal a more aggressive path. However, neither provided that, and traders found no indication of urgency for faster policy tightening.

The Federal Reserve, meanwhile, has taken a different direction, delivering a more hawkish stance on rates. That tempered bond market concerns to some extent, but 10-year Treasury yields remain near 5%. This continues to weigh on USD/JPY, keeping the dollar supported.

Looking at USD/JPY, price action remaining above 157 this week keeps traders alert for another possible intervention. Japan's market holidays have added complexity to the situation.

Lower liquidity allows relatively small flows to cause outsized moves, a fact Japanese authorities are well aware of. During May 4 and May 6, Japan's finance ministry bought yen during the Golden Week holiday as part of ¥11.7 trillion in intervention between late April and May.

Despite those intervention efforts, USD/JPY climbed back to near 164 from around 155 afterward. This serves as a reminder that intervention does not automatically alter the macroeconomic backdrop.

As long as US yields hover near 5%, Fed expectations stay hawkish, and the BOJ signals a relatively slow tightening approach, traders retain a strong rate incentive to hold long positions in USD/JPY.

At this point, intervention appears more about volatility than a clear bearish signal for USD/JPY.

A rapid 200 or 300 pip drop in USD/JPY can occur quickly, but whether it holds is uncertain.

Technically, there is little evidence that the USD/JPY rebound since last Friday is extending too far or too fast.

Upside momentum on the daily chart remains somewhat limited, with the 61.8% Fibonacci retracement of the early September decline near 157.52 capping gains. After that, the 200-day moving average at around 158.41 stands as the next resistance.

Technical factors could slow the advance for now, and traders appear to respect that. So while intervention risks are elevated on the final day of the Japanese market holiday, the appetite for such action may not be very strong at this point.

Attention will then shift to how USD/JPY behaves once Japanese markets fully reopen.

If the pair continues to push higher despite the BOJ rate hike and repeated intervention warnings, it would underscore the dominance of the US rates story.

But at these levels, traders must also consider the possibility that a single intervention headline could shift the intraday picture. The 160 level, noted by MUFG earlier this week, could be where Japanese authorities decide to step in again, even on a slow grind higher.