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US and Japan jointly intervene to prop up the yen for the first time since 1998, and crypto markets are paying attention
The coordinated currency intervention sent the yen surging from 40-year lows, raising fresh questions about carry trade unwinds and what that means for Bitcoin
Washington and Tokyo just tag-teamed the currency markets in a way they haven’t done in nearly three decades. US and Japanese authorities executed a coordinated yen-buying intervention on July 31 to August 1, marking the first joint operation of its kind since 1998.
The yen had been trading near a 40-year low of approximately 164 against the dollar. After the intervention, it rallied to the 156-157 range.
What happened and why it matters
US Treasury Secretary Scott Bessent confirmed the action was taken to counter what officials described as “disorderly” yen movements. He also noted that further joint interventions remain on the table if conditions warrant them.
President Donald Trump framed the move more diplomatically, calling it a sign of friendship with Japan and support for global economic stability.
Japan sits as the largest foreign holder of US Treasuries, with a position valued at over $1.1 trillion.
Japanese Finance Minister Satsuki Katayama coordinated the effort from Tokyo’s side. The intervention represents a significant escalation from Japan’s earlier unilateral attempts to defend the yen throughout 2026, which had produced limited and short-lived results.
Discussions about coordinated action reportedly began as early as January 2026.
The carry trade problem and Bitcoin’s exposure
In English: investors borrow cheaply in yen (because Japanese interest rates are low), then deploy that capital into higher-yielding assets elsewhere, including risk assets like equities and, yes, Bitcoin.
We saw a version of this play out in August 2024, when a surprise Bank of Japan rate hike triggered a brief but violent carry trade unwind that rippled through global markets. Bitcoin wasn’t spared.
CoinDesk has highlighted increased concerns over this exact scenario, noting that yen carry-trade unwinds could put selling pressure on BTC. But CoinDesk also noted that the broader strength of the dollar, not the yen specifically, remains the more decisive factor for BTC price action.
What investors should watch next
Bessent’s comment that further joint interventions are possible is the most important forward-looking signal here. It means the US has given Japan something close to a blank check for future coordinated action, which fundamentally changes the risk calculus for anyone positioned short the yen.
The broader macro picture hasn’t changed. The interest rate differential between the US and Japan remains wide. Unless the Bank of Japan meaningfully tightens policy or the Fed cuts rates, the fundamental pressure on the yen will persist.
The 1998 precedent is instructive: that intervention helped stabilize the yen during the Asian financial crisis, but it took months before the currency found a durable floor.