On August 3, QCP Capital stated that the United States and Japan jointly intervened in the forex market last Friday, a rare occurrence. The New York Federal Reserve, representing the U.S. Treasury, purchased yen, marking the first joint forex intervention by the U.S. and Japan since 2011, and the first coordinated action specifically to support the yen since 1998. This move has refocused the market on long-term U.S. Treasury yields, with the 30-year Treasury yield briefly rising to around 5.27%, the highest level since 2007, while the 10-year breakeven inflation rate remained at approximately 2.28%. Market attention has expanded to U.S. Treasury issuance, investor demand, and cross-border capital flows. For the crypto market, the rapid appreciation of the yen may trigger the unwinding of yen financing trades, impacting risk assets such as BTC and ETH; however, if the yen exchange rate stabilizes, it could help reduce the need for further interventions and alleviate liquidity pressures in the U.S. Treasury market. This intervention does not provide a clear directional signal for crypto assets but highlights that the USD/JPY exchange rate, Japan's financing environment, and long-term U.S. Treasury yields are becoming important factors influencing the liquidity environment for BTC and ETH.
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Japan and the United States bought yen together on 31 July 2026, their first coordinated yen-buying operation since June 1998, and the currency has since firmed from a 40-year low of 163.99 into the 155-156 area. This explainer sets out the three channels linking the yen to bitcoin: carry-trade unwind risk, yen-denominated repricing, and the dollar-weakness correlation that points the other way.
