Through the Federal Reserve's FIMA repo facility - a program for foreign central banks and other official institutions - counterparties can borrow dollars by pledging their US government debt as collateral, avoiding outright sales in the market. The Fed launched the tool in 2020, when the pandemic strained markets, and made it permanent in July 2021 so participants could obtain cash without causing too much turbulence in the Treasury market.
In the view of Evercore ISI's Marco Casiraghi and Gang Lyu, this is a short-term liquidity cushion, not a standing credit line, so anyone seeking to remain in dollars must roll the borrowing over. It is also "relatively costly," they wrote. Standard advances carry a 3.75% fee, and a seven-day borrowing costs the one-week overnight index swap rate plus a quarter-point markup.
The Fed has deliberately kept rates here above the cost of private repo financing, a sign the tool is reserved for market strain, not day-to-day funding or repeated currency intervention.
The facility has limitations. The dollar ceiling for one participant is $60 billion daily, which barely exceeds the intervention amount Tokyo was believed to have mobilized on Thursday, said Marco Casiraghi and Gang Lyu of Evercore ISI. This Fed program is usually quiet.
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In the week ending July 29, average balances were roughly $6 million, per the most recent central bank figures. The last notable usage was a $3 billion operation in early February.
"We see a risk that the focus on a capped Fed repo facility could backfire by inviting markets to test the commitment of the US and Japan to strengthen the yen if doing so requires large sales of US Treasuries," the strategists wrote.
The relatively low usage of the facility underlines its role as an emergency backstop. For Tokyo, using it repeatedly would eat into the tool's limited capacity and expose the limits of US support. For market participants, the debate is now whether a $60 billion daily cap is enough to deter speculative pressure on the yen.
Any changes to the facility would require sign-off from the central bank's foreign-currency subcommittee, which sits under the Federal Open Market Committee and must update the full FOMC about any planned adjustments.
The program's normally tiny balances show that the tool is not intended for routine use, meaning any move to tap it repeatedly would signal more active US-Japan coordination on the yen.
The Fed's facility gives Japan a way to support the yen without unloading its Treasury holdings, but the cost and the daily limit suggest it is an insurance policy rather than a standing spigot. If Tokyo keeps coming back to the window, markets will be watching whether Washington is willing to make the tool bigger or let the yen find its own level.
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