Option traders are preparing for increased volatility in the Japanese yen in anticipation of market intervention by the Bank of Japan.

As the market increasingly believes that the Japanese authorities may find it difficult to predict intervention to support the yen, option traders are raising prices to hedge against potential sharp fluctuations in the yen before the upcoming period of light trading ahead of the US holiday. The negative value of the one-period dollar against yen risk reversal index is further deepening, indicating that the market's demand for yen call options is relatively stronger than for dollar call options. At the same time, the one-period butterfly spread is widening, indicating that investors are paying more to hedge against significant price fluctuations in either direction. These trends together suggest that traders are preparing for increased market volatility and are leaning towards a stronger yen, reflecting their concerns that the Japanese government may intervene in the market. The lack of liquidity around the US Independence Day holiday may amplify any significant fluctuations in this currency pair.