TOOL API

get_ust_long_term_rates

Fetch US Treasury long-term rate composites and averages. Use when asked about 20-year bond constant maturity rates, long-term real rate averages, or extrapolation factors. Covers rate types: BC_20year, Over_10_Years, Real_Rate — combining daily long-term nominal rates with real long-term rate averages. For individual tenor yield curves use get_ust_yield_rates. For inflation-adjusted real yields use get_ust_real_yield_rates. For T-bill rates use get_ust_bill_rates. Consumes 1 API call per request.