U.S. Treasury Constant-Maturity Yields, Daily (Federal Reserve H.15)

federalreserve/h15-treasury-yields

Daily U.S. Treasury constant-maturity yields from the Federal Reserve Board's H.15 Selected Interest Rates release: 1-month, 3-month, 6-month, 1-, 2-, 3-, 5-, 7-, 10-, 20- and 30-year, in percent per year, for the most recent 1 to 100 observation days, oldest first. Market holidays appear with null yields. Board of Governors of the Federal Reserve System data, public domain; cite the Board as the source. Served by Eden Engine; not an official Federal Reserve Board product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

Board of Governors of the Federal Reserve System

Source: Board of Governors of the Federal Reserve System, Selected Interest Rates (H.15), public domain per federalreserve.gov/disclaimer.htm; please cite the Board as the source. Served by Eden Engine; not an official Federal Reserve Board product.

Use it

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "federalreserve/h15-treasury-yields" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "federalreserve/h15-treasury-yields" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "federalreserve/h15-treasury-yields", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "federalreserve/h15-treasury-yields", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "lastobs"
  ],
  "properties": {
    "lastobs": {
      "type": "integer",
      "maximum": 100,
      "minimum": 1,
      "description": "How many of the most recent observation days to return, 1 to 100. Market holidays count as observation days and carry null yields."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "source",
    "release",
    "unit",
    "series",
    "observations"
  ],
  "properties": {
    "unit": {
      "type": "string",
      "description": "The unit of every yield, percent per year."
    },
    "series": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "maturity",
          "series_code",
          "description"
        ],
        "properties": {
          "maturity": {
            "type": "string",
            "description": "For example 1-month or 10-year."
          },
          "description": {
            "type": "string",
            "description": "The Board's description of the series."
          },
          "series_code": {
            "type": "string",
            "description": "The Board's series code for the column."
          }
        },
        "additionalProperties": false
      },
      "description": "One entry per maturity, in the order the Board lists them."
    },
    "source": {
      "type": "string",
      "description": "The publisher: Board of Governors of the Federal Reserve System."
    },
    "release": {
      "type": "string",
      "description": "The Board's release name, H.15 Selected Interest Rates."
    },
    "observations": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "date",
          "yields"
        ],
        "properties": {
          "date": {
            "type": "string",
            "description": "Observation date, YYYY-MM-DD."
          },
          "yields": {
            "type": "object",
            "description": "Yield in percent per year for each maturity named in `series`, or null when the Board reports no data for that day (a market holiday).",
            "additionalProperties": {
              "type": [
                "number",
                "null"
              ]
            }
          }
        },
        "additionalProperties": false
      },
      "description": "One entry per observation day, oldest first, so the newest is last."
    }
  },
  "description": "The H.15 constant-maturity Treasury yields as records, oldest observation first.",
  "additionalProperties": false
}