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US Treasury Average Interest Rates by Instrument
x402
US Treasury Average Interest Rates by Instrument is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).
Returns the average interest rate the US Treasury currently pays on its debt, broken down by instrument type (bills, notes, bonds, TIPS, FRNs, total), plus the rate from one year prior.
Price / call$0.003
Success—
StatusUnknown
How this service works
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. US Treasury, public domain.
Output
Returns a JSON object with the reference date, data source attribution, and an array of instruments (e.g. Treasury Bills, Treasury Notes, Treasury Bonds, TIPS, FRNs, Total Marketable, Total Non-Marketable, Total Interest-Bearing Debt). 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.
Example use cases
Monitor government borrowing cost trends
“Pull the latest average interest rates the US Treasury is paying on all its debt instruments and tell me which ones have moved the most compared to a year ago.”
Fixed income research snapshot
“I'm putting together a macro briefing — what are the current average rates on Treasury bills, notes, bonds, TIPS, and FRNs, and how do they stack up against last year's figures?”
Fiscal debt cost analysis
“For a report on US government fiscal health, give me a breakdown of the average interest rate paid on total Treasury debt and each major instrument category, including the year-over-year change.”
Technical details
Endpoint
POSThttps://api.vextorium.com/tipos-medios-deuda-eeuu-pago?utm_source=zero.xyzWhen to prefer
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.
Side effects
- 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
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"fecha": "2026-08-31",
"fuente": "U.S. Treasury, Average Interest Rates on U.S. Treasury Securities (dominio público)",
"instrumentos": [
{
"tipo": "Marketable",
"instrumento": "Treasury Bills",
"tipo_medio_pct": 3.788,
"hace_un_anio_pct": 4.283
},
{
"tipo": "Marketable",
"instrumento": "Treasury Notes",
"tipo_medio_pct": 3.345,
"hace_un_anio_pct": 3.087
}
]
}
}Tags
x402
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