FRED has added three data series for the Macroeconomic Uncertainty Index for United States.

The Macroeconomic Uncertainty Index is a monthly measure of how unpredictable overall economic conditions are 1 month, 3 months, and 1 year ahead. Economists Kyle Jurado, Sydney Ludvigson, and Serena Ng use a set of 132 individual macroeconomic time series to calculate forecasting factors and estimate period-specific measures of uncertainty. More details are available here: Macro and Financial Uncertainty Indexes.