The use of the Fed's overnight reverse repo facility surged to an all-time high on Monday.
Total spending by the 68 participants totaled $765.1 billion, up from $747.1 billion on Friday and above the record of $755.8 billion set on June 17.
Overnight reverse repo agreements pay an interest rate of 0.05 per cent, helping to temporarily reduce reserve balances in the banking system.
Barclays had previously said demand for the Fed's reverse repo agreement could reach 750 billion to 800 billion euros a day, with the Fed's reserve balance likely to be $4.6 trillion by the end of the year.