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[G10 Currency Market Volatility Remains Low, Yen Intervention Risk Rekindles] ⑴ The foreign exchange options market remains in a wait-and-see mode following the Fed's decision, with implied volatility for most G10 currencies hovering at long-term lows. ⑵ The lack of actual volatility and directional bias continues to suppress option premiums, despite ongoing concerns about Middle East conflict and oil price inflation. ⑶ The euro/dollar and pound sterling movements are particularly stagnant, while the yen presents a different picture. ⑷ The euro/dollar implied volatility was already near long-term lows before the Fed's decision, with the 1-month benchmark now testing post-pandemic lows. ⑸ Risk reversal data shows that the downside and upside option premiums are only 0.2, lower than 0.45 in early September and 0.9 at the end of July, reflecting a lack of confidence in a deep decline. ⑹ The pound sterling trend is more pronounced, with euro/pound sterling implied volatility at its lowest level since the euro's inception in 1999. ⑺ The pound/dollar 1-month volatility is testing the 12-year low reached in mid-August. (8) The yen remained an exception, with overnight options covering Friday's Bank of Japan decision rising to their highest level in a year, indicating potential for significant volatility. (9) The Bank of Japan raised interest rates by 25 basis points to 1.25% as expected, but the 7-2 split vote and a less hawkish press conference pushed the USD/JPY exchange rate up by more than 2 points to 158.06. (10) Subsequently, implied volatility plummeted as event risk premiums were priced in and downside hedging was unwound, with the one-week implied volatility of USD/JPY falling by more than 2.0. (11) The overall message remains unchanged, with low actual volatility and a familiar trading range continuing to suppress implied volatility. (12) The key risk to this calm lies in further increases in oil prices and USD/JPY approaching 160 again, which could quickly escalate the threat of intervention.