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US Treasury Par Yield Curve API
x402
US Treasury Par Yield Curve API is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-12).
Returns the latest US Treasury par yield curve rates (1 month to 30 years) with basis-point changes versus N days ago, plus 10y-2y and 10y-3m spreads and inversion flag.
Price / call$0.004
Success—
StatusUnknown
How this service works
Latest US Treasury par yield curve (1 month to 30 years), change in basis points versus N days ago, 10y-2y and 10y-3m spreads and inversion flag. Official US Treasury data (public domain).
Output
Returns a JSON object with: an array of maturity buckets (1 Mo through 30 Yr) each containing the current par yield (%) and change in basis points vs the comparison date; the data date; the comparison date; the source label; the 10y-2y spread in basis points; the 10y-3m spread in basis points; and a boolean flag indicating whether the 10y-2y portion of the curve is inverted.
Example use cases
Daily yield curve inversion monitoring
“Check the current US Treasury yield curve and tell me if the 10y-2y or 10y-3m spread is inverted, and by how many basis points — compare against 30 days ago.”
Macro briefing for portfolio manager
“Give me a snapshot of today's full Treasury yield curve from 1-month to 30-year maturities, with how much each rate has moved in the last 90 days in basis points.”
Rate change alert for fixed income trader
“Fetch the latest Treasury par yield curve and highlight which maturities have moved the most in basis points over the past 7 days — I want to see what part of the curve is shifting fastest.”
Technical details
Endpoint
POSThttps://api.vextorium.com/curva-tesoro-eeuu-pago?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need authoritative, official US Treasury par yield curve data with built-in spread calculations and inversion detection — especially useful for macro analysis, fixed income monitoring, or any workflow that needs to track yield curve shape changes over time without building your own data pipeline from Treasury.gov.
Side effects
- Treasury data not yet published for today (data may lag by one business day)
- dias_comparar out of range (must be 1-365)
- Upstream Treasury website unavailable or rate-limited
- Weekend/holiday dates may return last available business day data
- No historical data available for the requested comparison date
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"curva": [
{
"plazo": "1 Mo",
"tipo_pct": 4.06,
"cambio_pb": 21
},
{
"plazo": "1.5 Month",
"tipo_pct": 4.1,
"cambio_pb": 22
},
{
"plazo": "2 Mo",
"tipo_pct": 4.13,
"cambio_pb": 24
},
{
"plazo": "3 Mo",
"tipo_pct": 4.17,
"cambio_pb": 25
},
{
"plazo": "4 Mo",
"tipo_pct": 4.26,
"cambio_pb": 29
},
{
"plazo": "6 Mo",
"tipo_pct": 4.27,
"cambio_pb": 27
},
{
"plazo": "1 Yr",
"tipo_pct": 4.44,
"cambio_pb": 26
},
{
"plazo": "2 Yr",
"tipo_pct": 4.78,
"cambio_pb": 39
},
{
"plazo": "3 Yr",
"tipo_pct": 4.91,
"cambio_pb": 45
},
{
"plazo": "5 Yr",
"tipo_pct": 5.01,
"cambio_pb": 46
},
{
"plazo": "7 Yr",
"tipo_pct": 5.12,
"cambio_pb": 46
},
{
"plazo": "10 Yr",
"tipo_pct": 5.24,
"cambio_pb": 45
},
{
"plazo": "20 Yr",
"tipo_pct": 5.64,
"cambio_pb": 37
},
{
"plazo": "30 Yr",
"tipo_pct": 5.61,
"cambio_pb": 34
}
],
"fecha": "2026-10-01",
"fuente": "U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates (dominio público)",
"comparado_con": "2026-09-01",
"invertida_2a_10a": false,
"diferencial_10a_2a_pb": 46,
"diferencial_10a_3m_pb": 107
}
}Tags
x402
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