All central banks, and the U.S. Federal Reserve System (FRS) as well
All central banks, and the U.S. Federal Reserve System (FRS) as well,

affect the foreign exchange markets changing discount rates and performing the monetary operations (as interventions and currency purchases).
For the foreign exchange operations most significant are repurchase agreements to sell the same security back at the same price at a predetermined date in the future (usually within 15 days), and at a system.specific rate of interest. This arrangement amounts to a temporary injection of reserves into the banking.
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