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US Treasury Par Yield Curve
x402
US Treasury Par Yield Curve is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.004/call, status unknown (last checked 2026-10-11).
Returns the latest US Treasury par yield curve rates (1 month to 30 years), basis-point changes versus N days ago, 10y-2y and 10y-3m spreads, and yield curve inversion flags.
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
A JSON object containing: the curve date, an array of term/rate/change-bp entries for each maturity from 1-month to 30-year, the comparison date, the 10y-2y spread in basis points, the 10y-3m spread in basis points, a boolean inversion flag for the 2y-10y, and the official Treasury data source attribution.
Example use cases
Daily yield curve inversion monitor
“Check the current Treasury yield curve and tell me whether the 10y-2y and 10y-3m spreads are in inversion territory, and how the spreads have moved over the last 7 days.”
Macro briefing for investment committee
“I need today's full US Treasury par yield curve from 1-month to 30-year, with how much each rate has changed in basis points compared to 30 days ago, for my morning macro briefing.”
Rate-change alert over past quarter
“How much have Treasury yields shifted across the curve over the past 90 days? Give me the current rates and the basis-point changes for each maturity.”
Technical details
Endpoint
POSThttps://api.vextorium.com/v1/us-treasury-yield-curve?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need official, authoritative US Treasury par yield curve data with built-in spread calculations and inversion flags — ideal for macroeconomic monitoring, fixed-income analysis, and rate-change tracking without having to parse raw Treasury XML yourself.
Side effects
- Treasury data not yet published for today — returns the most recent available date
- compare_days out of range (1-365) — validation error
- Treasury website unavailable causing upstream fetch failure
- Requested comparison date falls on a non-business day with no available data
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"date": "2026-10-01",
"curve": [
{
"term": "1 Mo",
"rate_pct": 4.06,
"change_bp": 21
},
{
"term": "1.5 Month",
"rate_pct": 4.1,
"change_bp": 22
}
],
"source": "U.S. Department of the Treasury, Daily Treasury Par Yield Curve Rates (public domain)",
"compared_with": "2026-09-01",
"inverted_2y_10y": false,
"spread_10y_2y_bp": 46,
"spread_10y_3m_bp": 107
}
}Tags
x402
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