https://fiscaldata.treasury.gov/datasets/average-interest-rates-treasury-securities/
Average Interest Rates on U.S. Treasury Securities | U.S. Treasury ...
Treasury Bills, 5.345%, 1 ; Treasury Notes, 2.660%, 2 ; Treasury Bonds, 3.178%, 3 ; Treasury Inflation-Protected Securities (TIPS), 0.734%, 4 ; Treasury Floating ...