Arthur Hayes, the BitMEX co-founder who runs the crypto fund Maelstrom, says the Federal Reserve's plan to help Japan defend the yen will pump fresh dollar liquidity into markets — and that's good news for Bitcoin. Hayes laid out the scenario in a newsletter this week, arguing that the Fed's FIMA Repo Facility will let Japan borrow against its Treasury stash instead of selling it, effectively printing money that will find its way into risk assets.
How the FIMA play works
The FIMA Repo Facility lets foreign central banks post US Treasuries as collateral for short-term dollar loans. Japan holds $1.143 trillion in Treasuries, according to Treasury Secretary Scott Bessent, who asked the Fed to expand the facility's $60 billion lending cap days after the US and Japan jointly intervened to support the yen.
Under Hayes's scenario, Japan would repo part of its Treasury pile for dollars, sell those dollars for yen, and reinvest the yen into domestic bonds and stocks. The Fed's balance sheet would grow to fund each loan. That's functionally similar to printing money, Hayes argues, even if the Fed frames it as a lending facility rather than quantitative easing.
Why the yen matters to crypto
The yen is the world's cheapest major funding currency. When it spikes suddenly, carry trades unwind — and that dragged down stocks and crypto together in August 2024. Hayes says routing the rescue through FIMA lets the unwind happen gradually. A sharp Bank of Japan rate hike, by contrast, risks a repeat of that shock.
He's not shy about the upside. Bitcoin is one of the most liquidity-sensitive assets in the market, he wrote. During the pandemic, the Fed's balance sheet grew from roughly $4.2 trillion to nearly $8.9 trillion by early 2022 — an increase of more than $4.6 trillion — while Bitcoin rose from under $10,000 to an all-time high near $69,000 in November 2021.
The pushback
Not everyone buys the certainty. Brad Setser, a former Treasury official, argues FIMA was built to backstop lending in moments of market stress, not to fund currency intervention. And any cap increase needs sign-off from the Federal Open Market Committee. Fed Chairman Kevin Warsh hasn't committed to a schedule.
Hayes treats the expansion as close to certain. The Fed hasn't confirmed it. That gap is the whole ballgame for traders watching the yen.
Hayes's own bet
Maelstrom is already long Bitcoin, Ether, and Ethena's ENA token, per Hayes's newsletter. So his read on the Fed isn't exactly disinterested — but the logic stands on its own. If the Fed opens the FIMA spigot, the dollar liquidity has to go somewhere.
The next concrete step is the FOMC's decision on the cap. Until Warsh signs off, the yen rescue stays a proposal. Hayes is betting it happens. The market will find out soon enough.
