The yen touched 163.23 per dollar on July 21, 2026, its lowest level since December 1986. This historic fall exposes the limits of a currency weakened by negative real rates and revives the narrative of bitcoin as a scarce asset.
In brief
- The yen fell to 163.23 per dollar on July 21, 2026, a level not seen in almost 40 years.
- The rise in oil, US yields and low Japanese real rates have added to the pressure.
- Bitcoin’s limited supply feeds its monetary narrative, without removing its price risk.
The yen crosses 163, a threshold forgotten for four decades
The threshold of 160 had already put Tokyo on alert. A month after the Bank of Japan raised its rates to their highest level since 1995, the yen resumed its fall and crossed 163 per dollar. The movement confirms that Japanese monetary tightening is not enough, at this stage, to close the gap with US yields.
According to Reutersthe Japanese currency reached 163.24 during trading in New York on July 21, its weakest level since the end of 1986. On the same day, the yield on the ten-year US Treasury note touched 4.64%, while the thirty-year rose to 5.15%. These levels supported the dollar.
Oil added further pressure. Brent reached $92.67 per barrel in Asia on July 22, amid escalation between the United States and Iran. However, Japan imports most of its energy. More expensive oil increases its external bill and weakens the yen, while the dollar also benefits from its status as a safe haven.
Tokyo threatens to intervene, but the market watches rates
The Japanese government may buy yen to curb a disorderly decline. However, currency traders doubt the lasting effect of intervention if the rate gap with the United States remains so wide.
Tokyo already conducted record purchases of yen in April and May 2026, when the dollar rose above 160 yen. Their effect has worn off. Japanese Finance Minister Satsuki Katayama once again promised “decisive” action in the event of excessive movements, without announcing an official threshold.
Japanese real rates remain negative as inflation further exceeds available monetary yield. HSBC therefore estimates that the dollar-yen pair could move mainly between 160 and 165, with occasional interventions to limit excesses.
The Bank of Japan nevertheless retains room for maneuver. A Reuters survey published on July 23 indicates that 86% of economists surveyed anticipate another rate hike in 2026, perhaps as early as October. On the other hand, 95% of them think that the central bank will not move during the current quarter.
Bitcoin wins an argument, not risk-free status
The falling yen reinforces the scarce assets argument: a central bank cannot increase the maximum supply of bitcoin, which its protocol caps at 21 million units. A saver exposed only to cash therefore suffers the loss of purchasing power of his currency when prices rise or the exchange rate falls.
This comparison, however, has its limits. The yen serves as a unit of account, means of payment and savings medium in a multi-trillion dollar economy. Bitcoin remains a volatile global asset whose price depends on liquidity, regulation and risk appetite.
The market recalled it on July 23. While the yen was still trading near its 40-year low, bitcoin fell 0.5% to $65,557.35, according to Reuters. Scheduled scarcity can support a long-term thesis, but it guarantees neither an immediate increase nor constant protection against each monetary shock.
In short, the yen concentrates three tensions: negative real rates, a heavier energy bill and doubts about public finances. The next decisions of the Bank of Japan, a possible intervention by Tokyo and the sensitivity of bitcoin to Brent will determine what happens next. This analysis does not constitute financial advice: scarcity does not eliminate volatility.
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