Bitcoin faces carry-trade risk as yen slides despite $97B intervention

Japan's yen weakened to 160.16 per dollar on Friday despite ¥15.4 trillion ($97 billion) in intervention, renewing carry-trade risks that could pressure Bitcoin.

"Japan owes Treasury nothing. There is therefore no risk that Japan will fail to repay a debt that does not exist," Treasury Secretary Scott Bessent wrote in a letter to Senator Elizabeth Warren on August 27, responding to her demand for disclosure on the intervention's legal basis and size.

The campaign, conducted jointly with the US on July 31, marked the first direct US yen purchase since June 1998, when the Fed and Treasury spent $833 million. Japan's Ministry of Finance published the ¥15.4 trillion total on August 28, covering operations between July 30 and August 26. The Treasury declined to disclose its own figure. The Exchange Stabilization Fund held $14.19 billion in euros and $2.57 billion in yen on June 30, per Treasury filings, and Bessent confirmed the operation involved selling euros for yen under Section 5302 of US law — not extending credit to Japan.

The fading intervention matters for crypto because yen-funded carry trades — borrowing yen at low rates to buy higher-yielding assets — can unwind violently if the currency strengthens. That dynamic triggered a 20 percent drawdown in Bitcoin and Ethereum in August 2024.

Why the Yen Rescue Is Fading

The yen's slide back toward 160 per dollar gives up more than half the gains delivered by the intervention, which had briefly strengthened the currency to 157.4. US interest rates remain above Japan's, keeping dollar-denominated assets more attractive. Fed chair Kevin Warsh's pledge this week to bring inflation to target added further dollar support, pushing Bitcoin below $77,000 at one point.

Japan holds $1.12 trillion of US debt, more than any other country, which is why Washington joined the intervention. Bessent said disorderly yen moves could trigger forced liquidation of Japanese investment positions and destabilize global financial markets, ultimately pushing up US borrowing costs. Warren had compared the operation to the US swap line extended to Argentina, but Treasury filings show Buenos Aires drew $2.5 billion of its $20 billion line and repaid every dollar by December 2025.

Bitcoin traded at $77,675 as of 09:12 UTC on August 29, down 3.8 percent over 24 hours, according to KuCoin data. Ethereum traded at $2,440.85, down 3.2 percent over the same period. The currency intervention's failure to hold yen strength raises the risk that Japanese authorities escalate further — or that the Bank of Japan raises rates — which could trigger a sharp yen appreciation and force carry-trade unwinding. A break below $77,000 would open the path toward the $75,000 support zone.

Metaplanet chief executive Simon Gerovich sees longer-term opportunity, arguing in Hong Kong this week that Asian savers are ready to move beyond cash into Bitcoin. His company holds 21,356 BTC on its balance sheet. Japanese retail investors and global hedge funds have historically used the yen as a funding currency, borrowing at near-zero rates to invest in higher-yielding assets across global markets. But near-term, the carry-trade dynamic remains the dominant risk factor, with the August 2024 precedent showing how quickly yen-funded positions can cascade into crypto sell-offs.

This article is for informational purposes only and does not constitute investment advice.