US Treasury yield curve API

The latest US Treasury constant-maturity yields across tenors (1mo→30yr) from FRED, in one call, with the 2s10s spread and an inversion flag. Answers 'Treasury yield curve today', 'is the curve inverted', '10-year yield', '2s10s spread', 'current interest rates'.

Price$0.01per request

MethodPOST

Route/v1/finance/yield-curve

StatusLive

MIME typeapplication/json

Rate limit30/minute

Cache3600s public

financeyield-curvetreasuryratesbondsinversionfredmacro

API URLhttps://x402.hexl.dev/v1/finance/yield-curve

Integration docs

Example request

{}

Example response

{
  "asOf": "2026-06-01",
  "curve": [
    {
      "tenor": "2Y",
      "months": 24,
      "yieldPct": 4.1,
      "date": "2026-06-01"
    },
    {
      "tenor": "10Y",
      "months": 120,
      "yieldPct": 4.4,
      "date": "2026-06-01"
    }
  ],
  "spread2s10s": 0.3,
  "inverted": false
}

Input schema

{
  "type": "object",
  "properties": {}
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}