The market is pricing in an 84% probability of a rate hike by the Bank of Japan in September.
Participants in the decentralized prediction market Polymarket have radically revised their expectations regarding the Bank of Japan's monetary policy. In just two weeks, the probability of a key rate hike in September has soared from 22% to 84%. This is a signal that cannot be ignored by either Forex traders or cryptocurrency investors, given the yen's global influence on risk appetite.
Failed interventions: why the yen is weakening again
The sharp reversal in market sentiment occurred after currency interventions by Japanese authorities ceased to have the desired effect. The yen has lost a significant portion of its recent gains, posting its worst weekly performance in three months. The USD/JPY rate fell by approximately 1% to 159.43, marking the weakest weekly result since May.
Notably, the Japanese currency has already retraced about half of the strengthening seen after the coordinated intervention by the Bank of Japan in late July and early August. At that time, the rate held around 164 per dollar, but selling pressure has now intensified again. A similar picture emerged earlier: after the April intervention, the yen slid back to a 40-year low in the following months, underscoring the limited effectiveness of one-off measures.
Betting on hawkishness: what lies ahead for the market
The connection between the failed interventions and rate expectations is obvious. The market is now betting that the Bank of Japan will be forced to move from verbal interventions to real action. Tokyo's former top currency diplomat Mitsuhiro Furusawa recently noted that authorities could deploy currency reserves at any moment and are also ready to signal a faster rate hike to support the national currency.
Analysts agree that interventions alone are insufficient to reverse the trend. The yen needs clear support from monetary policy, especially as inflation approaches the target level. However, the opposite scenario also carries risks: if the regulator leaves the rate unchanged, the market could react with sharp disappointment, and the yen would again head toward 160 per dollar.
Market participants are now betting on central bank steps rather than new currency interventions. This is a fundamental shift in perception: the market expects not one-off measures but a systematic policy tightening that can stabilize the currency in the long term.
My view: the 84% probability looks overstated, and the market may be too optimistic in expecting decisive action from the Bank of Japan. The central bank has historically been cautious and is unlikely to take a drastic step without sustained confirmation of inflationary pressure. Nevertheless, if the regulator does raise the rate, it would become a powerful catalyst for yen strengthening and could trigger a correction in global markets, including cryptocurrencies. Watch inflation data in the coming weeks—it will be the key trigger.