Atsushi Mimura, Japan’s Vice Finance Minister for International Affairs and the country’s top foreign exchange official, said authorities are watching currency moves very closely. He said Japan is staying alert as the yen becomes volatile again.
Mimura did not comment on any specific exchange-rate levels. He also said Tokyo is in close contact with US authorities.
Market Warning Signals
At the time of writing, USD/JPY was trading near 153.24. The pair was up 0.02% on the day.
Officials are clearly unhappy with the yen’s weakness as USD/JPY trades above 153. This kind of verbal warning is usually the first step. It is meant to make traders think twice before pushing the pair much higher. It also hints that policymakers may have an informal “line” near current levels.
This looks similar to what happened in 2024. Back then, authorities spent more than 9 trillion yen in April and May to support the currency after USD/JPY moved above 160. That shows two things: their tolerance for yen weakness can be high, but they are also willing to act fast when needed.
For derivatives traders, this urgency means more uncertainty—and that shows up in higher implied volatility. One-month implied volatility for USD/JPY has jumped to 9.5%, up from around 7% last month. In plain terms, the market is expecting a higher chance of sudden, sharp moves. That also makes options more expensive to buy.
Rates Differential Still Dominates
Downside protection is likely to get pricier. In particular, USD/JPY put options may rise in cost relative to calls. This means traders are paying more to protect against a quick drop caused by intervention. As a result, strategies such as selling call spreads to help pay for put options may look more attractive as costs rise.
Even so, intervention threats are pushing against strong fundamentals. The Bank of Japan’s policy rate is near 0.1%, while the U.S. Federal Reserve keeps rates above 3.5%. That wide gap still encourages traders to sell the low-yielding yen. Any official action would be fighting this large interest-rate difference.
Create your live VT Markets account and start trading now.
here to set up a live account on VT Markets now
