Bitcoin traders eye US-Japan $96B yen intervention

The US Treasury joined Japan on July 31 in a coordinated yen-buying operation after preliminary central-bank data indicated Tokyo may have spent nearly $96 billion over two days. Japan held about $1.14 trillion in US government securities at the end of May.

Japan’s Ministry of Finance confirmed on Aug. 3 that it purchased yen in coordination with the US Treasury to counter months of “excessive volatility and disorderly movements.” Central-bank figures indicate the Bank of Japan may have spent about $58.97 billion in an initial intervention and another $36.58 billion in a follow-up operation that involved the United States.

The joint action was Washington’s first coordinated yen-buying intervention with Tokyo since 1998 and the Treasury’s first foreign-exchange intervention since 2011. The interventions lifted the yen from near 164 per dollar to about 155.20, before it eased to roughly 157.8 as markets assessed the chance of more joint action.

According to Treasury Secretary Scott Bessent, “Treasury remains attentive and in close communication with our counterparts at MOF and BOJ. We will not hesitate to participate in further joint intervention.” Japanese Finance Minister Satsuki Katayama also indicated readiness to act again.

Markets flagged two areas of potential impact. First, Tokyo can finance yen purchases by selling foreign reserve assets, including US Treasuries. Large disposals of Treasuries could lower bond prices and push US yields higher. Second, higher Japanese yields at home could encourage banks, insurers and pension funds to keep more capital in Japan rather than buying overseas bonds, reducing foreign demand for US debt.

The Bank of Japan left its policy rate at 1% but signaled another increase could come as early as September. Japan’s two-year government-bond yield briefly hit 1.545%, its highest since 1995, as markets priced in further tightening.

Japan could limit immediate sales pressure on Treasury markets by using the Federal Reserve’s FIMA Repo Facility to raise dollars against Treasuries held at the New York Fed instead of selling securities outright. That option would reduce direct sales into Treasury markets, while not eliminating the risk that higher domestic yields encourage repatriation of capital.

The interventions also affected carry trades that borrow in yen to finance higher-yielding investments abroad. A rapid yen appreciation or rising Japanese rates can force investors who borrowed in yen to buy back the currency, often by selling foreign assets.

Bitcoin prices moved during the episode. BTC fell to as low as $62,382 during the 24-hour period around the interventions, later rising to about $64,163 and trading near $63,510 as markets digested the news.

Jake Kennis, senior research analyst at Nansen, noted that the initial bitcoin dip recovered and described the episode as a short-term volatility event rather than evidence of a broad carry-trade unwind. Taran Dhillon, head of digital assets at Kula, recommended watching Japanese government-bond yields closely for further signals. André Dragosch, European head of research at Bitwise, said tighter Japanese financial conditions could reduce global liquidity and eventually affect broader asset markets if repatriation of capital occurs.

Markets will likely monitor the pace of any further yen appreciation and changes in Japanese yields for signs of wider effects on Treasuries and risk assets.