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[Foreign Exchange Options Market Remains Volatile, with Yen Intervention Risks Emerging] ⑴ Following last week's Fed decision, the foreign exchange options market remained in a wait-and-see mode. Implied volatility for most G20 currencies hovered at long-term lows, with low actual volatility and a lack of new directional catalysts continuing to suppress option premiums. ⑵ The euro against the dollar and the pound are typical examples of this stagnation. The euro against the dollar's implied volatility was already near long-term lows across all maturities before the Fed decision and remained under pressure afterward, with the benchmark 1-month rate slightly higher than the post-pandemic lows. ⑶ Risk reversal indicators show that the premium spread between down and up options rose slightly from 0.1 to 0.2 after the Fed decision, compared to 0.45 in early September and 0.9 at the end of July, highlighting the market's lack of confidence in further euro/dollar depreciation. ⑷ The spot rate may be anchored this week by a large number of 1.1500 strike price options expiring, with approximately €8 billion daily distributed across various maturities. Related hedging flows will help keep the currency pair within a range; the path of least resistance still favors sideways movement rather than a sharp decline. (5) The pound showed a more pronounced similar trend, with implied volatility for the euro against the pound at its lowest level since the euro's inception in 1999, and the benchmark 1-month volatility at only 2.8. The 1-month volatility for the pound against the dollar continued to test the 12-year low of 4.75 reached in mid-August. (6) Implied volatility for the dollar against the yen collapsed after the Bank of Japan raised interest rates to 1.25% last Friday. The divided vote and accompanying rhetoric failed to achieve the hawkish tone needed to build confidence in a sustained yen recovery. One-week volatility fell by more than 2.0 to just over 8, and the 1-month volatility fell by nearly 1.0 to 8.0. (7) The subsequent rise in the dollar against the yen triggered an official exchange rate check, timely alerting the market to the risk of intervention. This should have helped limit further gains in the spot exchange rate. Implied volatility recovered some ground on Monday but has since subsided again, as verbal intervention dampened momentum. (8) The overall message remains unchanged: persistently low realized volatility and familiar trading ranges continue to suppress implied volatility. The main risks to this calm are still stronger oil prices and the USD/JPY pair approaching 160.00 again, which would reignite the debate over intervention.