The ESF
The ESF uses special drawing rights from muh IMF so the funds come from them. The FRB is just shifting liability around. This needs time to play out
The Exchange Stabilization Fund (ESF) consists of three types of assets: U.S. dollars, foreign currencies, and Special Drawing Rights (SDRs), which is an international reserve asset created by the International Monetary Fund.
The ESF can be used to purchase or sell foreign currencies, to hold U.S. foreign exchange and Special Drawing Rights (SDR) assets, and to provide financing to foreign governments. All operations of the ESF require the explicit authorization of the Secretary of the Treasury.
The Secretary is responsible for the formulation and implementation of U.S. international monetary and financial policy, including exchange market intervention policy. The ESF helps the Secretary to carry out these responsibilities. By law, the Secretary has considerable discretion in the use of ESF resources.
The legal basis of the ESF is the Gold Reserve Act of 1934. As amended in the late 1970s, the Act provides in part that "the Department of the Treasury has a stabilization fund …Consistent with the obligations of the Government in the International Monetary Fund (IMF) on orderly exchange arrangements and an orderly system of exchange rates, the Secretary …, with the approval of the President, may deal in gold, foreign exchange, and other instruments of credit and securities.
https://home.treasury.gov/policy-issues/international/exchange-stabilization-fund
https://home.treasury.gov/policy-issues/international/exchange-stabilization-fund
(from an anon's previous post - img prolly unrelated)