The service reports on holdings and purchases of U.S. Treasury securities by the New York Federal Reserve Bank as part of its role in implementing U.S. currency supply policy. It provides data updated weekly either for batch download or for real-time access via a web service. Applications can access this authoritative data for selected time periods starting in 2003.
API methods support retrieval of either a summary or specific time series data, either monthly or quarterly, for open market holdings by the New York Fed. Methods also allow retrieval of holdings data by type of security.
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So far, we don't have a record of any changes to this API