The uncertainty of the Fed's policy is heating up, traders are betting on a return of volatility in the foreign exchange market.

With the bank warning of potential changes in the Federal Reserve policy expectations and escalating geopolitical tensions that could impact the market, foreign exchange traders have begun to buy more hedging tools after experiencing months of calm, in order to guard against exacerbated exchange rate fluctuations. Data shows that an indicator measuring the expected volatility of major currencies in the next month has slightly increased in recent weeks, but still only slightly higher than the five-year low reached in June, and far below the average level for the year. At the same time, the one-year implied volatility of the euro against the dollar has also risen from its low point since 2022, but the one-month implied volatility of the euro against the Swiss franc remains at its lowest level in more than a decade. The cost of hedging against major currency fluctuations remains relatively low. The low volatility in the foreign exchange market has also made arbitrage trading one of the most profitable foreign exchange trading strategies this year. Arbitrage trading typically involves borrowing low-yielding currencies like the yen or the Swiss franc, then buying high-yielding currencies including emerging market currencies to earn interest rate differentials. So far this year, this strategy has delivered a return of around 8%, outperforming global bonds and gold. Strategists at Goldman Sachs say that the significant interest rate differentials between developed economies and the continued low market volatility have created the most favorable market environment for arbitrage trading in over 20 years. Arbitrage trading's return on foreign exchange has outperformed bonds and gold since the beginning of the year. Goldman Sachs strategist Stuart Jenkins wrote in a report, "It is the stability of G10 country interest rates in the current range the decrease in the actual volatility brought about by the interest rate differentials, coupled with the market's perception of limited future policy actions that enables the G10 foreign exchange arbitrage yields to increase concurrently with the low volatility." Hedge funds and asset management firms often use arbitrage trading to profit from interest rate differentials between different markets, as long as exchange rates remain stable, this strategy can continue to be profitable. However, the strategy also comes with risks. The second key factor supporting arbitrage trading low volatility may be disappearing. Because arbitrage profits accumulate gradually, losses from exchange rate fluctuations may occur rapidly within minutes. Therefore, once market volatility suddenly increases, it may trigger rapid liquidation of arbitrage positions and amplify market volatility as a whole. Meanwhile, the market is far from calm. Under the leadership of the new Federal Reserve Chairman Kevin Wash, the Federal Reserve is gradually reducing clear guidance on interest rate paths provided to the market, making traders increasingly reliant on each economic data release to assess policy direction. At the same time, renewed conflict between the US and Iran threatens the already fragile ceasefire situation in the Middle East. Barclays bank strategists believe that this market performance and the macroeconomic environment's disconnect cannot continue in the long run. Led by Marek Rzasko, the strategy team at the bank suggests that future foreign exchange market volatility may increase and recommends that investors buy related financial instruments that can profit when volatility in the euro against the dollar intensifies later in the year. They wrote in a report, "The reason why foreign exchange market volatility is currently low is not because of decreasing macroeconomic uncertainty, but because the market lacks clear directional judgment." Foreign exchange traders familiar with these trades say that some investors seeking short-term returns and interbank trading desks also seem to have reached similar conclusions. As the current cost of hedging remains relatively low compared to potential risks, leveraged investors are actively positioning themselves in trading strategies to profit once market volatility increases. There are signs showing that the market may be changing. As the foreign exchange options market begins to factor in the upcoming US inflation data to be released next week, the hedging costs for short-term options on the euro and pound have rebounded from their lows this week. This also serves as a reminder to the market that after the Federal Reserve reduced forward guidance, the impact of individual economic data on the market has reached its highest level in years. The upcoming US inflation report may influence market bets on the Federal Reserve's interest rate path. Currently, the market still expects the Federal Reserve to raise rates by at least 25 basis points this year. Currently, the market is still generally betting that the future market environment will remain stable. However, if volatility returns, trading strategies that have benefited from the low volatility environment may quickly face significant liquidation. Furthermore, if foreign exchange market volatility continues to rise, its impact will extend far beyond the options market.