Traders are assessing an uncommon sequence of actions after Japan confirmed on Monday that it had intervened to buy yen last Friday with support from the U.S. Treasury. Rather than the more typical transaction of purchasing yen with dollars, two market sources told market participants that the U.S. Treasury purchased yen using euros - a move that confirmed an earlier report.
Analysts at HSBC described the operation as "a highly unusual - maybe unprecedented - step." The choice of euros as the counter currency appears intended to help Japan reinforce the yen while avoiding any implication that Washington wants a broadly weaker dollar, which could have repercussions for U.S. inflation and monetary policy.
Lee Hardman, senior currency analyst at MUFG, noted that with U.S. inflation running above target, a softer dollar would be unwelcome at this juncture. A broadly weaker dollar could feed into higher inflation in the United States, potentially giving a divided Federal Reserve more reason to consider raising interest rates.
Japan's Ministry of Finance also intervened in currency markets on Thursday, and in addition to the joint action on Friday there were sharp moves on Monday that market participants flagged as potentially intervention-driven. The yen, trading around 157 per dollar, has recovered ground from 40-year lows near 164. It registered almost a 4% rise last week, the largest weekly gain in two years.
Currency strategists at Barclays commented that the U.S. Treasury's selection of euros as the intervention currency helps keep the operation focused on supporting the yen rather than signaling a desire for dollar depreciation. Movements in one cross rate ripple rapidly through the market, forcing banks and traders to reprice related pairs such as euro/yen, dollar/yen and euro/dollar.
Data from central banks published on Monday suggested Japan may have spent as much as $36.58 billion buying yen during the Friday intervention. Attention is now on the longer-term consequences of the U.S. selling euros into the market in order to acquire yen.
MUFG's Hardman said the impact on the euro might be limited because the United States holds a relatively modest amount of euros available for intervention. The latest available figures indicate the U.S. has roughly 26 billion in euros ready for intervention across its System Open Market Account and the Exchange Stabilization Fund.
An ECB spokesperson declined to comment on reports that the U.S. authorities had sold euros for yen, though a person familiar with the events said the European Central Bank had been in contact with the U.S. Federal Reserve about the matter. The U.S. Treasury did not respond to a request for comment, and the New York Fed - which typically executes interventions on behalf of the Treasury - also declined to comment.
Market observers are watching whether interventions represent a narrow, yen-focused effort or hint at broader coordination among major central banks. Last week, reports indicated South Korea coordinated with Japan when it sold U.S. dollars and bought won.
HSBC analysts said it would be materially more significant if the ECB were to sell euros against the yen, since that would resemble a currency agreement among major economies aimed at strengthening the yen. They characterized such an outcome as low probability but high impact.
Context and market reaction
The sequence of interventions and the choice of counterpart currency by the U.S. Treasury have prompted rapid repricing across FX markets. The euro, which peaked as high as 187.4 yen on Thursday, slipped briefly below 180 yen on Monday - a move exceeding 4% from the recent high. These shifts demonstrate how a targeted intervention in one pair cascades into related exchange rates almost immediately as market participants update valuations.
For now, the operational details and the scale of holdings available for intervention constrain how much immediate pressure the selling of euros might place on the euro exchange rate. But the intervention has already altered market dynamics, lifting the yen from extreme lows and provoking debate about central bank coordination and the implications for inflation and interest rate policy in the United States.
Conclusion
The reported tactic of the U.S. Treasury buying yen with euros marks a departure from standard intervention practice and reflects authorities' desire to support the yen without nudging the dollar lower. The near-term impact on currency markets has been pronounced, but questions remain about whether a wider multilateral effort to strengthen the yen is underway - and what that would mean for global markets and central bank policy going forward.