Japan and the US just threw $36.58 billion at propping up the yen. The market’s response, according to nearly every currency strategist polled by Reuters: nice try, won’t work.

A Reuters poll conducted from July 31 to August 5 found that the US dollar is expected to stay firm, with nearly 95% of roughly 60 FX strategists asserting that Japanese government interventions won’t provide a sustainable fix for the yen’s persistent weakness. That’s one of the most pessimistic readings on the yen since the poll started in the early 1990s.

The intervention playbook and its limits

Here’s what happened. The US and Japan executed a coordinated yen-buying intervention around July 31 to August 1, briefly dragging USD/JPY from nearly 164, a 40-year low for the yen, down to approximately 156.5-157. Japan’s total interventions in 2026 have now surpassed $100 billion.

US Treasury Secretary Scott Bessent confirmed that the US stands ready to participate in further joint interventions to support the yen.

The overwhelming consensus among strategists is that without a meaningful shift in monetary policy, specifically additional rate hikes from the Bank of Japan, the yen’s structural weakness will persist.

Why crypto traders should pay attention

This matters for Bitcoin and broader crypto markets for two interconnected reasons.

First, there’s the yen carry trade. This is the strategy where investors borrow cheaply in yen and park the proceeds in higher-yielding assets, including risk assets like crypto. When the yen suddenly strengthens, those trades can unwind violently as investors rush to pay back their yen-denominated loans. We saw exactly this play out in August 2024, when a carry trade unwind contributed to a sharp sell-off across risk assets, Bitcoin included.

Second, Bitcoin’s price movements are correlating more closely with US dollar strength than with carry trade unwind fears. When the dollar is strong, Bitcoin tends to face headwinds. When the dollar weakens, crypto generally catches a bid.

The bigger picture for markets

The yen’s predicament is a symptom of a broader divergence in global monetary policy. The Bank of Japan has been among the last major central banks to maintain ultra-accommodative policy, while the Federal Reserve has kept rates elevated relative to pre-2022 norms. That interest rate differential is the primary engine driving yen weakness, and no amount of intervention can sustainably override it.

The key variable to watch isn’t whether Japan intervenes again. It’s whether the BOJ signals a meaningful policy shift toward higher rates. That would address the root cause of yen weakness, potentially weaken the dollar, and, in a cascading effect, remove one of the macro headwinds facing risk assets including crypto.