{"uid":"cap_iFjjYyCpmnPyvaSE2yH5S","slug":"us-treasury-average-interest-rates-by-instrument-d31b65f3","name":"US Treasury Average Interest Rates by Instrument","description":"Average interest rate the US Treasury pays on its debt by instrument (bills, notes, bonds, TIPS, FRNs...) and total, with the rate one year earlier. 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Each instrument entry includes its type category (Marketable/Non-Marketable), instrument name, current average interest rate as a percentage, and the equivalent rate from one year earlier.","failureModes":["Data not yet updated for the current period — response may reflect the most recent available month","Empty or null values for some instruments if Treasury has not issued that instrument type recently","Network or upstream API timeout resulting in no response","Malformed POST body (wrong bodyType or missing required input wrapper) causing a 400 error"],"whenToPreferThis":"Use this endpoint when you need authoritative, official US Treasury data on average debt costs by instrument type — particularly for macroeconomic analysis, fiscal research, fixed income context, or year-over-year borrowing cost comparisons. Prefer this over market yield APIs (which show current market prices) when you specifically want the weighted average rate Treasury is actually paying on outstanding securities, not the current auction or secondary market yield.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-29T06:49:16.304Z","isFirstParty":false,"canonicalSlug":"us-treasury-average-interest-rates-by-instrument-d31b65f3"}