USD/JPY Tests 160.00 as US Treasury Details Joint Intervention

A recent report from the Federal Reserve Bank of New York revealed details of a joint currency operation conducted on July 31, in which the U.S. Treasury utilized its Exchange Stabilization Fund to support the Japanese yen. Acting as an agent for the Treasury, the New York Fed sold euros from foreign currency holdings in the spot market to acquire £79.4 billion, equivalent to roughly $497 million at an exchange rate near £159.8 per dollar. Although the U.S. did not directly sell dollars, triangular arbitrage across cross-rates transmitted the euro-for-yen support directly into the USD/JPY pair.

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While the $497 million U.S. contribution was modest compared to the $97.5 billion Japan deployed through late August—representing roughly 0.5% of Tokyo's total expenditure—the intervention carried significant symbolic weight as the first coordinated action between Washington and Tokyo in FX markets in nearly three decades. The primary motivation for Washington was safeguarding the U.S. bond market. Japanese purchases of U.S. Treasuries dropped 99% year-over-year to $389 million between January and August, and Washington sought to prevent outright Japanese Treasury liquidations that could drive U.S. borrowing costs higher.

USD/JPY has since re-approached critical resistance, rising from around 158.00 to touch 159.94 before settling near 159.63. The rapid move prompted immediate verbal intervention from Japanese authorities. Atsushi Mimura, Japan's top currency official at the Finance Ministry, warned that the recent depreciation was overly rapid. Furthermore, U.S. Treasury Secretary Scott Bessent and Japanese Finance Minister Satsuki Katayama have reaffirmed their readiness to conduct further market operations if disorderly moves persist.

The underlying fundamental pressure on the yen remains rooted in monetary policy divergence. The Federal Reserve's target rate stands at 3.75–4.00%, with market futures pricing in 25-basis-point rate hikes in December, January, and March following three consecutive months of above-forecast U.S. core CPI readings. Conversely, the Bank of Japan's policy rate remains at 1.25%. Even with an 87% probability of a BOJ rate increase in December, projected Fed tightening threatens to widen yield differentials further, keeping the bias firmly bullish for USD/JPY.

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A notable structural change since the summer intervention is the confirmation that Japan can access dollar liquidity via the Federal Reserve's FIMA Repo facility without liquidating U.S. Treasuries. This facility reduces technical hurdles for future intervention while protecting U.S. yields. With U.S. PPI data serving as an immediate fundamental test, USD/JPY remains anchored near the 160.00 threshold, where further intervention risks remain elevated in the absence of a broader BOJ hawkish shift.

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