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
Participants of the decentralized prediction platform Polymarket have sharply revised their expectations regarding Japan's monetary policy. In just two weeks, the probability of the Bank of Japan raising its key interest rate at the September meeting has surged from 22% to 84%. This is a signal that cannot be ignored by either Forex traders or cryptocurrency investors.
Such a dramatic shift in estimates occurred after the currency intervention by Japanese authorities ceased to support the yen. The national currency has lost a significant portion of its recent gains and is showing its worst weekly performance in the last three months.
The Effect of Intervention Is Fading
This week, the yen has declined by approximately 1%, reaching the level of 159.43 per dollar. This is the worst weekly result since May. Notably, the Japanese currency has already given back about half of the gains it received following the coordinated currency intervention by the Bank of Japan in late July and early August. Before these measures, the rate was holding near the level of 164 per dollar.
It is important to understand: a similar picture has already been observed before. After the April intervention, the yen slid back to a 40-year low in the following months. This suggests that one-off measures without a change in fundamental monetary policy are not capable of altering the trend.
Significantly, even Tokyo's former top currency diplomat Mitsuhiro Furusawa emphasized in his comments that the authorities are ready to deploy currency reserves at any moment. However, he also noted that officials could signal a faster rate hike to support the currency — and it is precisely this scenario that traders are now pricing in.
Players Are Betting on a Rate Hike
The connection between intervention and decisions on the key interest rate explains the shift in market expectations. Polymarket participants estimate the probability of a quarter-point rate hike at above 80%. Such a consensus looks quite rational: inflation in Japan is approaching the target level, and a weak yen is increasing pressure on import prices.
OCBC strategist Sim Moh Siong rightly notes that interventions alone will not reverse the dynamics of the Japanese currency. The yen needs clear support from the Bank of Japan, which is ready to tighten monetary policy.
"It is not surprising that the yen has again lost ground," Siong stated.
The opposite scenario carries significant risks. If the regulator leaves the rate unchanged, the market will quickly react with disappointment. After such decisions, the yen has already fallen to 160 per dollar. Currently, market participants are counting on steps from the central bank rather than new currency interventions.
My analysis: The market has effectively cornered the Bank of Japan — now, any delay in raising the rate will be perceived as weakness and provoke a new weakening of the yen. For the crypto market, this is an important macroeconomic signal: tightening BOJ policy could strengthen the yen and trigger an unwinding of carry trades, which historically creates pressure on risk assets, including bitcoin. Keep an eye on the September meeting — this event could become a trigger for increased volatility.