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US Treasury Par Yield Curve (CMT Rates)
x402
US Treasury Par Yield Curve (CMT Rates) is a paid API for AI agents from x402stock.vercel.app, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).
Returns the daily US Treasury par yield curve (Constant Maturity Treasury rates) for all maturities from 1 month to 30 years, in percent.
Price / call$0.01
Success—
StatusUnknown
How this service works
The daily US Treasury par yield curve (Constant Maturity Treasury rates) for every maturity from 1 month to 30 years, in percent. Defaults to the latest published day; pass `?limit=` for more recent days (max 250) and `?year=YYYY`. No ticker needed. Use for the risk-free rate, rate-sensitivity context, and yield-curve inversion in macro-aware analysis. From x402stock
Output
Returns an array of dated records, each containing CMT yield rates (in percent) keyed by maturity label (e.g. '1M', '3M', '2Y', '10Y', '30Y'), along with metadata including source ('us_treasury'), as_of date, list of maturities, unit ('percent'), and count of records returned.
Example use cases
Example prompt
“Pull the latest US Treasury par yield curve — all maturities from 1 month to 30 years — so I can check if the curve is inverted and grab the risk-free rate for my valuation model.”
Technical details
Endpoint
GEThttps://x402stock.vercel.app/api/v1/treasury-yieldsWhen to prefer
Use this endpoint when you need authoritative US Treasury CMT rates for risk-free rate inputs, yield curve shape analysis (inversion detection), interest rate sensitivity context, or macro-aware financial modeling — without needing any stock ticker or security identifier. Prefer over scraping Treasury.gov or using stale cached data.
Side effects
- Invalid year parameter outside 1990-2100 range returns validation error
- Limit exceeding 250 returns error; limit must be a positive integer
- No data available for requested year (e.g. future year) returns empty or null
- Rate limiting or payment failure returns 402 payment required
- Treasury data may lag by one business day; weekends/holidays return last published day
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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