Bitcoin Jumps 8.8% as U.S. Treasury Signals Bigger, Routine Long-End Buybacks

Bitcoin (BTC) has now traded through two U.S. market interventions in less than three weeks, reacting in opposite directions each time. A move aimed at supporting the yen pressured BTC lower. A policy shift targeting long-dated yields sparked an 8.8% surge. U.S. Treasury Secretary Scott Bessent escalated the message on Thursday, saying Treasury buybacks could exceed $4 billion per issue and would be conducted routinely, while disputing that interest rates drove the decision. Bloomberg reported his comments as the Treasury moved to turn what had looked like a one-off into a standing policy. Two interventions, two very different Bitcoin outcomes The split is less about intervention itself and more about what the intervention does to long-term U.S. borrowing costs. Bitcoin has tended to respond best when policy action pushes long-dated Treasury yields lower. The first episode landed at the start of August. Japan supported its currency with an estimated $53 billion operation. The New York Fed then bought yen for the Treasury on August 1, the first time Washington had bought yen since 1998. Bitcoin still drifted toward $63,000, down about 1.25%, even as U.S. equities finished higher. Positioning helps explain why crypto took the hit. Many investors fund risk exposure by borrowing cheaply in yen and buying higher-returning assets, a strategy known as the carry trade. When the yen strengthens sharply, those trades become more expensive to maintain. Crypto typically sits at the high-risk end of that chain and gets sold first. The key detail was in rates. Long yields did not fall during that week. The 10-year ended around 4.74%, its highest level since January 2025, while the 30-year hovered near post-2007 highs. One interpretation is that the yen operation reduced the need for Japan to sell U.S. Treasuries, protecting the currency without easing long-end yields—leaving Bitcoin with little reason to rally. The second intervention arrived on August 19 and hit bonds directly. The Treasury doubled its long-end buybacks, lifting the maximum size of each operation to at least $4 billion. The move followed a session in which the 30-year yield touched 5.337%, the highest since 2007. Bitcoin responded quickly. About $1.23 billion in crypto short positions was liquidated within 60 minutes. By Thursday, BTC traded near $69,803, up 8.8% over 24 hours. Why long yields matter more than the yen Long-dated Treasury yields set a baseline return for taking minimal risk. When 30-year bonds pay more than 5%, they compete directly with risk assets. Lower those yields and the math shifts: borrowing becomes cheaper, the dollar tends to soften, and capital can move further out the risk curve. “When yields drop and the dollar weakens, risk assets tend to rally,” said Jeff Mei, chief operating officer at exchange BTSE. The two episodes also differ in how they affect positioning. A stronger yen forces unwinds. Falling yields invite risk-taking. That invitation produced the larger move. Skeptics note the 8.8% spike was magnified by short covering rather than purely new buying. But squeezes still need a catalyst, and in this case the catalyst was the drop in yields following the buyback signal. What could end the rally The biggest risk remains yields themselves. Both interventions have already begun to fade. In FX, USD/JPY was near 158.79 on Thursday, close to where it traded before the yen-support operation, suggesting the effect has largely dissipated. In rates, TradingView data showed the 10-year near 4.692% on Thursday, close to the 4.710% level seen before the announcement. The 30-year rose to about 5.237% after dipping to 5.192%. Scale is part of the challenge. The increase implies roughly $14 billion in additional buybacks against a Treasury market exceeding $30 trillion, and the program does not begin until September 9. “While increasing liquidity buyback operations by $2 billion might seem like rearranging deckchairs on the Titanic given the U.S. national debt of $40 trillion, yesterday’s intervention by the U.S. Treasury has been warmly greeted by investors around the world,” ING’s Chris Turner wrote Thursday. Bessent’s follow-up aimed to close the gap between flow and signal. Beyond saying buybacks could exceed $4 billion per issue and become routine, he also pointed to weak liquidity in the 30-year sector and argued yields do not reflect underlying fundamentals—unusually candid remarks for a sitting Treasury Secretary. At the same time, he denied that rates were the motivation, even as markets traded the shift as a direct attempt to influence long-term yields. He added that the deficit has likely peaked under this administration, a claim that would reduce supply pressure behind the roughly $40 trillion U.S. debt load. Two developments could still flip sentiment: a clean break above 5.34% in the 30-year yield, or a more hawkish Federal Reserve after minutes showed three officials favored a rate hike. For now, markets are weighing a fading near-term impact against a growing policy commitment—with Bitcoin acting as a real-time scorecard.