Yen slides to 1986 low, crypto traders watch carry trade

The Japanese yen hit its weakest level against the US dollar since December 1986, trading near ¥162 per dollar in late June. The yen carry trade is back, and Bitcoin sits in its blast radius.

The mechanics are simple. Borrow yen at low rates. Convert to dollars. Invest in higher-yielding assets. Pocket the spread. The Bank of Japan's policy rate sits at roughly 1%, while the Federal Reserve's rate is near 3.5%. That 250-basis-point gap creates a powerful incentive.

CFTC data show speculative short positions against the yen reached a nine-year peak by mid-June 2026. Japan's finance ministry deployed a record ¥11.7 trillion, about $72.5 billion, between late April and May to prop up the currency. The intervention halted the slide near ¥155. The yen resumed its descent and blew past that level.

Bitcoin struggled below $60,000 during the same period. The correlation is not a coincidence. The same macro forces that push the yen lower also weigh on risk assets.

The BOJ has two real options. Intervene again with another massive sum. Or raise rates more aggressively, narrowing the gap with the Fed. A rate hike would trigger a carry trade unwind. Traders who borrowed yen to buy risk assets would need to sell those assets and buy yen to repay loans, traders said. A version of this played out in 2024, contributing to sharp drawdowns across global markets. With short positions at nine-year highs, the sequel could be more dramatic.

Traders are watching for Japan's next threshold, the level at which the BOJ feels compelled to act. Whether that is ¥165, ¥170, or some other number, the answer will ripple through every risk asset. Bitcoin sits squarely in that blast radius.