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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 x402-apis.pages.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-22).
Returns official US Treasury daily par yield curve rates (1 month to 30 years) and key spreads (10Y-2Y, 10Y-3M) for any business day since 1990
Price / call$0.002
Success—
StatusUnknown
How this service works
Use when an agent needs US government bond yields, a risk-free rate or the yield curve (e.g. 2Y/10Y spread, recession signal, discounting): official US Treasury daily par yield curve, 1 month to 30 years, latest or any day since 1990 (weekends/holidays return the previous business day). Includes 10Y-2Y and 10Y-3M spreads. Source named in every answer. Bad input: HTTP 400 before payment; outage is not charged.
Output
A JSON object containing the effective date, a yieldsPct object with par yields across all standard maturities (1M, 2M, 3M, 6M, 1Y, 2Y, 3Y, 5Y, 7Y, 10Y, 20Y, 30Y), and a spreadsPct object including the 10Y-2Y and 10Y-3M spreads. Weekend and holiday dates automatically return the previous business day's data. Source attribution is included in every response.
Example use cases
Recession signal monitoring
“Check whether the US yield curve is currently inverted — I need the 10Y-2Y and 10Y-3M spreads from the official Treasury data to assess recession risk.”
DCF discount rate lookup
“I'm valuing a company and need the current risk-free rate — can you pull today's official US 10-year Treasury yield?”
Historical yield curve comparison
“Pull the full US Treasury par yield curve for March 15 2007, right before the financial crisis — I want to see what the curve looked like then versus today.”
Technical details
Endpoint
GEThttps://x402-apis.pages.dev/v1/treasury-yields?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need authoritative, official US Treasury yield data — for risk-free rate inputs to DCF models, yield curve shape analysis, recession indicator monitoring (inverted curve), or any context requiring a citable government source. Prefer this over financial data aggregators when source credibility and official accuracy matter. It covers every standard maturity from 1 month to 30 years and includes pre-computed spreads, saving calculation steps.
Side effects
- HTTP 400 returned for invalid or unparseable date input before any payment is charged
- Date before 1990-01-02 returns an error as data is unavailable
- Weekend/holiday dates are handled gracefully by returning the prior business day (not an error)
- Service outage: not charged if the endpoint is unavailable
- Future dates will return an error or empty data as no curve has been published
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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