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Treasury Yield Curve History (x402 Supply)
x402
Treasury Yield Curve History (x402 Supply) is a paid API for AI agents from treasury-yield-curve.x402supply.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-10-18).
Returns US Treasury par yield curve data (1mo to 30yr maturities, in percent) for a range of business days between a start and end date.
Price / call$0.005
Success—
StatusUnknown
How this service works
US Treasury par yield curve (1mo to 30yr, percent) for one date, or the latest if omitted. Weekend or holiday dates return the nearest prior business day with a note. Data from U.S. Treasury; not financial advice.; US Treasury par yield curves for every business day between startDate and endDate (ma
Output
A JSON object containing an array of yield curves, one per business day in the requested range. Each curve entry includes the date and a yields map keyed by maturity label (1mo, 2mo, 1.5mo, 3mo, 4mo, 6mo, 1yr, 2yr, 3yr, 5yr, 7yr, 10yr, 20yr, 30yr) with percent values. Also includes metadata: count of curves returned, unit (percent), asOf timestamp, source URL(s), and the resolved startDate/endDate used.
Example use cases
Yield curve inversion research
“Get me the Treasury yield curve for every business day in Q3 2023 — I want to track whether the 2-year was still yielding more than the 10-year throughout that period.”
Risk-free rate lookup for valuation model
“What were the 1-year and 10-year Treasury par yields for each business day the first two weeks of January 2024? I need them for a DCF model.”
Spread analysis over a month
“Pull the full Treasury yield curve data for every day between October 1 and October 31 2026 so I can chart how the spread between the 3-month and 30-year evolved.”
Technical details
Endpoint
POSThttps://treasury-yield-curve.x402supply.com/tools/yield_curve_history?utm_source=zero.xyzWhen to prefer
Choose this endpoint when you need historical US Treasury par yield curve data across a range of business days (up to 31 days per call). It is ideal for multi-day trend analysis, spread calculations, or building time-series of risk-free rates across the full maturity spectrum. Prefer the sibling single-date endpoint for one-off point-in-time lookups. Use this over general financial data APIs when you specifically need official US Treasury par yield data sourced directly from treasury.gov.
Side effects
- Date out of range — startDate before 1990-01-02 returns an error
- Date range exceeds 31 days between startDate and endDate
- Invalid date format (non-YYYY-MM-DD) returns a validation error
- Weekend or holiday startDate/endDate is shifted to nearest prior business day automatically
- Future dates beyond today return no data or a capped response
- Treasury source data temporarily unavailable may cause fetch failure
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| endDate | string | YYYY-MM-DD, at most 31 days after startDate. Defaults to startDate plus 30 days, capped at today |
| startDate | string | YYYY-MM-DD, 1990-01-02 or later |
Output
Schema · Response
{
"type": "json",
"example": {
"asOf": "2026-10-09T17:48:01.949Z",
"unit": "percent",
"count": 2,
"curves": [
{
"date": "2026-10-01",
"yields": {
"1mo": 4.06,
"1yr": 4.44,
"2mo": 4.13,
"2yr": 4.78,
"3mo": 4.17,
"3yr": 4.91,
"4mo": 4.26,
"5yr": 5.01,
"6mo": 4.27,
"7yr": 5.12,
"10yr": 5.24,
"20yr": 5.64,
"30yr": 5.61,
"1.5mo": 4.1
}
},
{
"date": "2026-10-02",
"yields": {
"1mo": 4.04,
"1yr": 4.46,
"2mo": 4.11,
"2yr": 4.83,
"3mo": 4.19,
"3yr": 4.96,
"4mo": 4.26,
"5yr": 5.06,
"6mo": 4.27,
"7yr": 5.17,
"10yr": 5.28,
"20yr": 5.67,
"30yr": 5.63,
"1.5mo": 4.09
}
}
],
"source": [
"https://home.treasury.gov/resource-center/data-chart-center/interest-rates/pages/xml?data=daily_treasury_yield_curve&field_tdr_date_value_month=202610"
],
"endDate": "2026-10-02",
"startDate": "2026-10-01"
}
}Tags
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