US Treasury interest rates: average rates on bills, notes, bonds and all federal debt, monthly

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Average interest rates on US Treasury securities by month from the Treasury's Fiscal Data: bills, notes, bonds, TIPS, floating rate notes and the non-marketable series, with totals for marketable, non-marketable and all interest-bearing debt, for the latest month and up to 24 months. US federal data, public domain, from a dated snapshot. Use for the US government's borrowing cost, a rate trend or macro context; not a live yield curve.

Run it free (25 free calls) Buy credits by card (from $1) Example result (JSON)

Try it with your own inputs

Months of history for the totals, 1-24 (default 12)

Uses one of your 25 free calls. Nothing is charged, and a call that fails is not counted.

Inputs

NameTypeDescription
monthsintegerMonths of history for the totals, 1-24 (default 12)
securitystringOptional filter on the security name: bills, notes, bonds, TIPS, floating, marketable…

Request

Over HTTP, with a card key from /credits:

curl -H "Authorization: Bearer adt_…" "https://agent-data-tools.revmesh2074.workers.dev/econ/treasury-rates?months=12"

Or one of your 25 free calls, no key:

curl "https://agent-data-tools.revmesh2074.workers.dev/econ/treasury-rates?months=12&trial=1"

Without a key, the same URL answers 402 Payment Required with x402 and MPP terms, so an agent with a wallet pays per call in USDC (Base, Polygon, Arbitrum or Solana over x402; Base or Tempo over MPP) and retries.

Example result

{
  "month": "2026-10",
  "recordDate": "2026-10-31",
  "rates": [
    {
      "type": "Marketable",
      "security": "Treasury Bills",
      "ratePercent": 4.014
    },
    {
      "type": "Marketable",
      "security": "Treasury Notes",
      "ratePercent": 3.399
    }
  ],
  "totals": {
    "marketable": 3.57,
    "nonMarketable": 3.63,
    "interestBearingDebt": 3.58
  },
  "history": [
    {
      "month": "2026-10",
      "marketable": 3.57,
      "nonMarketable": 3.63,
      "interestBearingDebt": 3.58
    }
  ],
  "note": "Monthly averages of the interest paid on outstanding securities, not today's market yields.",
  "snapshotAt": "2026-11-07T08:30:00.000Z",
  "dataset": "Average Interest Rates on U.S. Treasury Securities",
  "datasetUrl": "https://fiscaldata.treasury.gov/datasets/average-interest-rates-treasury-securities/",
  "source": "U.S. Department of the Treasury, Fiscal Data (public domain)"
}

From an AI agent (MCP)

Add the MCP server to Claude, Cursor or any MCP client. This tool is econ_treasury_rates, and the first 25 successful calls are free:

https://agent-data-tools.revmesh2074.workers.dev/mcp

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