Source: Board of Governors of the Federal Reserve System (US)  

Release: H.3 Aggregate Reserves of Depository Institutions and the Monetary Base  

Units:  Millions of Dollars, Not Seasonally Adjusted

Frequency:  Weekly, Ending Wednesday

The Board of Governors discontinued the H.3 statistical release on September 17, 2020. For more information, please see the announcement posted on August 20, 2020.

The series equals total balances maintained plus currency in circulation.

Effective February 2, 1984, reserve computation and maintenance periods have been changed from weekly to bi-weekly. Series with data prior to February 2, 1984 have different values reported from one week to the next. After February 2, 1984, the value repeats for 2 consecutive weeks.

Source: Board of Governors of the Federal Reserve System (US)  

Release: H.6 Money Stock Measures  

Units:  Billions of Dollars, Not Seasonally Adjusted

Frequency:  Weekly, Ending Monday

The currency component of M1, sometimes called "money stock currency," is defined as currency in circulation outside the U.S. Treasury, Federal Reserve Banks, and vaults of depository institutions. Data on total currency in circulation are obtained weekly from balance sheets of the Federal Reserve Banks and from the U.S. Treasury. Weekly currency in circulation data are published each week on the Federal Reserve Board's H.4.1 statistical release "Factors Affecting Reserve Balances of Depository Institutions and Condition Statement of Federal Reserve Banks." Vault cash is reported on the FR 2900 and subtracted from total currency in circulation. For institutions that do not file the FR 2900, vault cash is estimated using data reported on the Call Reports.

For questions on the data, please contact the data source. For questions on FRED functionality, please contact us here.

Source: Federal Reserve Bank of St. Louis  

Release: St. Louis Bi-Weekly Reserves and Monetary Base  

Units:  Billions of Dollars, Seasonally Adjusted

Frequency:  Biweekly, Ending Wednesday

Updates of this series will be ceased on December 19, 2019. There is no replacement to this seasonally adjusted series. Interested users can construct a proxy of not seasonally adjusted data as the difference between monetary base from the H.3 release and currency component of M1 from the H.6 release. The discontinued series plotted on the same graph with the calculated data can be accessed for comparison here.
For more details, see the FRED Announcement.