The market is pricing in an 84% probability of a rate hike by the Bank of Japan in September: what is happening with the yen
The derivatives market and prediction platforms are rapidly shifting their expectations regarding Japan's monetary policy. According to my analysis of Polymarket data, the probability of the Bank of Japan raising its key interest rate at the September meeting is currently estimated by participants at 84%. Just two weeks ago, this figure stood at only 22% — an impressive reversal in sentiment that demands close attention.
Failed currency interventions: the yen under pressure again
The key trigger for such a sharp change in consensus has been the ineffectiveness of recent currency interventions by Japanese authorities. This week, the yen (JPY) declined by approximately 1%, reaching 159.43 per dollar. This is the worst weekly result since May. The currency has already lost about half of the gains recorded after the coordinated interventions by the Bank of Japan in late July and early August, when the exchange rate held around 164 per dollar.
The historical context only amplifies the concern. After the April intervention, the yen once again slid back to 40-year lows in the following months. This confirms my long-standing observation: one-off targeted interventions without changes to fundamental monetary policy are unable to reverse the trend.
Betting on tightening: signals from the regulator
The connection between interventions and key rate decisions is now obvious to most players. Former Tokyo chief currency diplomat Mitsuhiro Furusawa previously noted that authorities could deploy currency reserves at any moment. However, a more important signal is his willingness to let the market understand that a rate hike could occur faster than expected — precisely to support the national currency.
Market strategists, including experts from OCBC, agree that interventions alone are insufficient. The yen needs clear support from the Bank of Japan, which is ready to tighten policy. Inflation in the country is approaching the target level, creating favorable conditions for rate normalization.
My expert view: The opposite scenario — keeping the rate unchanged — carries significant risks. In that case, the market would quickly react with disappointment, and the yen could once again collapse to the 160 per dollar level. Currently, market participants are betting precisely on central bank action, not on new interventions. If the Bank of Japan meets expectations, we will see yen strengthening; if not, we face another wave of volatility that will also affect global markets, including the cryptocurrency one.