Arthur Hayes Says Fed’s Japan Yen Plan Will Pump Bitcoin

Arthur Hayes says a Fed plan to help Japan defend the yen will print new dollar liquidity, and he argues that liquidity will pump Bitcoin (BTC).

Hayes co-founded BitMEX and now runs the Maelstrom family office. He has built a reputation for macro calls that tie Fed and Treasury policy moves directly to crypto prices.

How A Yen Rescue Becomes Dollar Liquidity

The mechanism he describes is real, though its scale is not yet confirmed. It runs through the Foreign and International Monetary Authorities (FIMA) Repo Facility, a Fed program that lets foreign governments post US Treasuries as collateral for short-term dollar loans, instead of selling those Treasuries outright.

My essay "Yen-quake" walks readers through how Buffalo Bill Bessent plans to manipulate the dollar-yen exchange rate and turn the money printer back on."While a weak, weaker, and weakest yen propelled global asset markets higher over the past decade, like all good things for… pic.twitter.com/4tXwuKMFPg

— Arthur Hayes (@CryptoHayes) August 11, 2026

Treasury Secretary Scott Bessent has said Japan holds $1.143 trillion in US Treasuries. Under Hayes’ scenario, Tokyo repos part of that stockpile for dollars, sells the dollars for yen, and reinvests the yen into domestic bonds and stocks.

The Fed’s balance sheet grows to fund each loan, which is functionally similar to printing money, though the Fed frames it as a lending facility rather than quantitative easing (QE).

Hayes’ bet is that these dollars do not stay contained. BTC, in his view, is one of the most liquidity-sensitive assets in the market.

Why The Fed Balance Sheet Matters For Bitcoin

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 in asset purchases, according to Federal Reserve research.

Over that stretch, the Bitcoin price ran from under $10,000 to an all-time high near $69,000 in November 2021. Hayes treats that stretch as the template.

There is a second layer. The yen is the world’s cheapest major funding currency, meaning traders borrow yen cheaply to buy other assets. A sudden yen spike forces those trades to unwind fast, which dragged down stocks and crypto together in August 2024.

Hayes argues that routing the rescue through FIMA lets the unwind happen gradually. A sharp Bank of Japan (BOJ) rate hike, by contrast, risks a repeat of that 2024 shock, which he says makes FIMA the friendlier path for BTC.

The Administration Side Checks Out, So Far

Bessent asked the Fed to expand FIMA’s $60 billion lending cap. This was days after the US and Japan jointly intervened to support the yen. He called the facility an important backstop and said he wants its cap raised in the months ahead.

Not everyone agrees FIMA is the right tool. Brad Setser, a former Treasury official, has argued the facility was built to backstop lending in moments of market stress, not to fund currency intervention.

Any cap increase also needs sign-off from the Federal Open Market Committee (FOMC). Fed Chairman Kevin Warsh has not committed to a schedule. Hayes treats the expansion as close to certain. The Fed has not.

Hayes’ own newsletter discloses that Maelstrom is already long Bitcoin, Ether (ETH), and Ethena (ENA). These are the same assets he says this liquidity will lift.