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US Treasury Constant-Maturity Yield History
x402
US Treasury Constant-Maturity Yield History is a paid API for AI agents from agent402.tools, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-14).
Returns the last N business days of US Treasury constant-maturity yields (oldest to newest) sourced from FRED DGS series.
Price / call$0.005
Success—
StatusUnknown
How this service works
Last N business days of US Treasury constant-maturity yields, oldest→newest. Source: FRED DGS* series (St. Louis Fed), public domain. ?days=30 (1-250, default 30).
Output
A time series of US Treasury constant-maturity yield values for the requested number of business days, ordered from oldest to newest, sourced from the FRED DGS series published by the St. Louis Federal Reserve. Includes dates and yield percentages.
Example use cases
Example prompt
“Can you pull the last 60 business days of US Treasury constant-maturity yields from FRED so I can see the recent trend in rates?”
Technical details
Endpoint
GEThttps://agent402.tools/api/treasury-yield-historyWhen to prefer
Use this endpoint when you need historical US Treasury constant-maturity yield data from an authoritative public-domain source (FRED/St. Louis Fed) without needing to set up your own FRED API key. Ideal for financial analysis, risk-free rate lookups, yield curve analysis, or macroeconomic modeling requiring recent Treasury rate history.
Side effects
- days parameter outside 1-250 range returns validation error
- FRED upstream data unavailable causes service error
- Payment failure (402) if USDC payment not provided
- Non-business days skipped automatically — fewer rows than calendar days expected
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Output
Schema · Response
{
"type": "json",
"example": {
"days": 30,
"count": 30,
"history": [
{
"yr2": 4.71,
"yr10": 4.46,
"recordDate": "2026-05-01"
}
]
}
}Tags
x402
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