Yen Volatility Sparks Intervention Watch Amid Rate Hike Uncertainty

The yen has been volatile in recent days, sparking speculation about potential intervention from Tokyo. Despite a rate hike by the Bank of Japan to its highest level in 31 years on Friday, the yen dropped 2% last week and was trading at 156.64 per US dollar as markets remained closed for a three-day holiday.

The BOJ's decision to raise rates to 1.25% was expected, but the two dissenting votes and lack of explicitly hawkish guidance disappointed investors, leading to a sharp decline in the yen before reports emerged that Japanese officials were conducting rate checks, a precursor to currency intervention.

Fred Neumann, chief Asia economist at HSBC, pointed out that the BOJ's messaging has become increasingly difficult due to the Federal Reserve's hawkish signal with its unanimous decision to raise its policy rate. The yen had firmed up in early September as traders bet on a faster pace of BOJ hikes and signs of repatriation by Japanese investors but has since surrendered some gains.