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30 Year Treasury Yield API

The 30-year Treasury yield — the long bond, the longest point on the par curve.

Retrieve the 30 Year Treasury yield programmatically with the Treasury Yield API. The current value is available on the full yield curve, and the complete history is available as a time series using the year_30 maturity code.

As of the latest reading, the 30 Year Treasury par yield was 5.25%. Data is sourced from the U.S. Department of the Treasury and updated every business day.

Current 30 Year yield

The 30 Year rate is included in the current yield curve from /v1/treasuryyield (field year_30 in rates):

{
  "date": "2026-08-10",
  "type": "par",
  "maturity": "year_30",
  "rate_pct": 5.25
}

Historical 30 Year yield

Get the 30 Year time series from /v1/treasuryyieldhistorical?maturity=year_30:

{
  "type": "par",
  "maturity": "year_30",
  "data": [
    {
      "date": "2026-08-05",
      "rate_pct": 5.23
    },
    {
      "date": "2026-08-06",
      "rate_pct": 5.22
    },
    {
      "date": "2026-08-07",
      "rate_pct": 5.19
    },
    {
      "date": "2026-08-10",
      "rate_pct": 5.25
    }
  ]
}

Related

  • Treasury Yield API — full curve (par, real/TIPS, and bill rates) plus 2s10s / 3m10s spreads.
  • Interest Rate API — central bank policy rates and benchmark rates (SOFR, EURIBOR).
(4.1)

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Applications using this API

API Status

Online - All Systems Operational

API Response Times

Average
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344ms376ms387ms753ms998ms

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Code Examples

1 2 curl -X GET "https://api.api-ninjas.com/v1/treasuryyieldhistorical?maturity=year_30" \ -H "X-Api-Key: YOUR_API_KEY"

Frequently Asked Questions

  • Yes, but you must have a premium subscription. Commercial use of the Treasury Yield API is not permitted on the free tier. See our pricing page to choose a plan that fits your needs.
  • Sign up for a free account to instantly get your API key, then pass it in the X-Api-Key header on every request. The documentation above includes ready-to-run examples in cURL, Python, JavaScript, Node.js, and more.
  • Your API requests will simply be denied once you hit your monthly quota — you will never be charged more than the plan you signed up for. To increase your quota, you can upgrade your plan any time on our pricing page.
  • The API responds with a standard HTTP status code and a JSON error message describing the problem. See our error codes reference for the full list of codes and how to resolve each one, or contact support if you need help.