U.S. Treasury / Daily par yield curve and bill rates for a year (CSV)

Daily Treasury rates for one calendar year as the Treasury's own CSV text, newest day first: daily_treasury_yield_curve (par yield curve, 1 month to 30 years, %), daily_treasury_bill_rates (bank discount and coupon equivalent by bill tenor), daily_treasury_long_term_rate, daily_treasury_real_yield_curve (TIPS, 5 to 30 years). About 16 KB per year; the Treasury takes about 20 seconds to answer. A future year returns an empty text. Source: U.S. Department of the Treasury, Bureau of the Fiscal Service (fiscaldata.treasury.gov), free and without restriction. Free on looot: $0 per call.