SKN | Bitcoin Benefits From a Surging Yen, but the Carry Trade Risk Is Rising

Key Points:

• Bitcoin rose alongside gold as the Japanese yen strengthened sharply, with USD/JPY falling 1.4% to 156.40 and extending the previous day’s 0.9% decline.
• The yen’s advance pushed the U.S. Dollar Index down 0.4% to 99.22, placing it close to its 200-day moving average near 99.10.
• A stronger yen could eventually become a headwind for Bitcoin if it triggers an unwinding of yen-funded carry trades, a dynamic that contributed to Bitcoin’s roughly 20% decline during the August 2024 carry-trade shock.

Bitcoin is benefiting from an unusual currency-market dynamic: a rapidly strengthening Japanese yen is weakening the U.S. dollar and, for now, supporting dollar-denominated assets including cryptocurrencies. The relationship is important for institutional investors because the same yen rally that is pressuring the dollar could eventually create a liquidity reversal if investors begin unwinding positions financed through Japan’s historically low interest rates.

Yen Strength Is Driving Broad Dollar Weakness

The Japanese yen strengthened as much as 2.5% over two sessions, with USD/JPY falling 1.4% Thursday to 156.40 after declining 0.9% Wednesday. The move has not been isolated to the yen: the euro, British pound and Australian dollar also gained against the greenback, pointing to a broader weakening of the U.S. currency.

The Dollar Index consequently declined 0.4% to 99.22, just above its 200-day moving average near 99.10. For global markets, that technical level matters because a sustained break below it could encourage additional dollar selling and ease financial conditions.

That backdrop is generally supportive for Bitcoin. Because BTC is priced in dollars, a weaker greenback can improve the relative appeal of dollar-denominated assets and reduce some of the financial tightening associated with a strong U.S. currency.

Why Bitcoin and Gold Are Responding Positively

Bitcoin and gold have both responded positively to the dollar’s decline, despite the yen’s traditional association with risk-off periods. The apparent contradiction reflects the fact that the currency composition of the Dollar Index can matter more immediately for these assets than the yen’s conventional safe-haven status.

Bitcoin’s correlation with macro liquidity has become increasingly relevant as institutional participation has expanded. When the dollar weakens and global financial conditions become less restrictive, capital can move toward assets with higher volatility and greater sensitivity to liquidity conditions.

However, the current relationship should not be interpreted as permanently bullish. The speed of the yen’s appreciation is becoming increasingly important.

The Carry Trade Could Reverse the Bitcoin Tailwind

For more than a decade, investors have used relatively inexpensive yen financing to acquire assets overseas, including equities, bonds and cryptocurrencies. A disorderly yen rally can make those positions more expensive to maintain, potentially forcing investors to sell assets and repay yen-denominated funding.

The precedent is significant. During the August 2024 yen carry-trade unwind, Bitcoin fell roughly 20% within several days as global risk positions were rapidly reduced. A similar mechanism could emerge if the current yen appreciation accelerates beyond an orderly adjustment.

BOJ Policy Is Becoming a Critical Market Variable

Markets are increasingly pricing a higher probability that the Bank of Japan raises its policy rate from 1% to 1.25% at its September 18 meeting. Reuters reported that traders were assigning approximately 75% odds to a 25-basis-point increase, while BOJ board member Hajime Takata has called for a more flexible response to inflation. :contentReference[oaicite:0]{index=0}

For crypto investors, the key question is therefore not simply whether the yen continues rising. It is whether the move remains orderly enough to weaken the dollar without triggering forced deleveraging. USD/JPY, the DXY, BOJ rate expectations and global funding conditions will be critical indicators. Bitcoin’s near-term resilience could benefit from continued dollar weakness, but an abrupt yen surge could transform that same currency move into a source of significant downside pressure.