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Key Takeaways
- Arthur Hayes argues Japan is most likely to defend the yen by repoing Treasury holdings to the Fed for dollars through the FIMA facility, then buying yen with the proceeds.
- He calculates Japan and GPIF hold roughly $1.373 trillion in Treasuries that could theoretically flow through this mechanism, though no official has proposed it.
- Hayes is positioning Bitcoin, gold, and Ethereum to capture the resulting liquidity, calling his views speculative personal positioning rather than a confirmed policy forecast.
Arthur Hayes, the former BitMEX chief executive who now runs the family office Maelstrom, published an essay this week arguing that the U.S. Treasury and Japan’s Ministry of Finance have converged on a single method to strengthen the yen: channeling newly created dollars through the Federal Reserve’s currency swap facility.
Hayes contends the mechanics of that approach would flood global markets with dollar liquidity, and he is positioning Bitcoin, gold and Ethereum to capture much of it.
Three Ways Japan Could Defend the Yen, and Why Hayes Picks One
In the essay, published on his Substack under the title “Yen Quake,” Hayes lays out three paths Japan could take to push its currency higher. The Bank of Japan could raise interest rates aggressively, but Hayes argues that would deepen losses on the central bank’s large holdings of low-yield government bonds and raise Tokyo’s own debt service costs.
A second option would have Japan lean on institutions such as the Government Pension Investment Fund to sell foreign assets and buy domestic ones.
Hayes contends this path is unworkable in practice because it would turn one of the largest holders of U.S. Treasuries into a net seller. He argues that Washington cannot tolerate this shift, given how dependent American markets remain on that demand.
The third option is the one Hayes says is most likely. Under his thesis, Japan’s Ministry of Finance would repo its Treasury holdings to the Federal Reserve through the Foreign and International Monetary Authorities facility in exchange for dollars, then use those dollars to buy yen in the open market.
The Bottleneck: A $60 Billion Cap on Currency Swaps
Hayes identifies the facility’s current structure as the limiting factor in his thesis. The FIMA facility caps each counterparty’s outstanding loan at $60 billion, a ceiling he argues is too small relative to the scale of intervention Japan may need.
He points to an intervention Hayes describes as recent, which he says burned through more than $100 billion while pushing the yen up only about 5% for a few trading days. He used that episode to argue the current toolkit is undersized for the task.
Under Hayes’s thesis, removing the cap and adding additional counterparties, such as the pension fund GPIF, would change the scale of what the facility could support.
The Number Behind the Thesis: $1.373 Trillion in Treasury Holdings
Hayes calculates that Japan’s government and GPIF together hold approximately $1.373 trillion in U.S. Treasuries that could theoretically flow through the swap facility under his proposed mechanism. He compares that figure to the roughly $4 trillion the Federal Reserve printed during its response to the COVID-19 pandemic.
This figure represents a theoretical ceiling on what Hayes calculates could move through the facility, not a confirmed plan or an amount any official has proposed using. No U.S. or Japanese official has publicly outlined a proposal matching the mechanism Hayes describes.
Betting the Liquidity Lands in Bitcoin, Not AI Data Centers
Hayes frames his market thesis in blunt terms. He wrote in the essay:
“The more they print, the higher Bitcoin goes.”
He said he would rather see the resulting liquidity flow into Bitcoin and gold than into artificial intelligence infrastructure spending, which he characterized as wasteful.
Among individual assets, Hayes singled out Ethereum as undervalued relative to other major cryptocurrencies. He also named Ethena’s ENA token as a smaller, higher-risk position he believes could multiply several times over if his broader thesis plays out.
Both calls reflect Hayes’s personal market positioning and should be read as one investor’s speculative bet rather than a forecast grounded in confirmed policy action.
A Currency Story Analysts Have Been Watching for Weeks
Hayes’s essay follows numerous weeks of other analysts flagging similar pressure on the yen from different angles. After the Bank of Japan held its policy rate at 1% in late July, an analyst using the handle EGRAG CRYPTO warned that Japan was approaching what they described as one of the most dangerous monetary crossroads in modern financial history.
They cautioned that unwinding yen-funded carry trades could force selling across stocks, bonds and Bitcoin simultaneously.
That warning came weeks after the yen fell to its weakest level against the dollar since 1986. Following that move, an analyst known as Hupzy at Spot On Chain said the currency weakness would likely keep supporting crypto prices as long as the macro tailwind from yen depreciation persisted. That support would last until the interest rate differential between the U.S. and Japan narrows.
Whether Hayes’s specific mechanism plays out as described remains speculative. No confirmed policy action matching his thesis has been announced by either government, and his projections about Bitcoin, gold and Ethereum reflect his own investment positioning rather than a base case shared broadly across the market.
