Treasury average interest rates API

Return the latest average interest rates on US Treasury securities (bills, notes, bonds, TIPS, etc.) from the keyless US Treasury FiscalData API, normalized into a clean per-security list with numeric rates for the most recent record date. Answers 'what is the average interest rate on Treasury bills?','what rate is the government paying on its debt?'.

Price$0.01per request

MethodPOST

Route/v1/gov/treasury-rates

StatusLive

MIME typeapplication/json

Rate limit60/minute

Cache3600s public

govtreasuryinterest-ratebondsbillsfiscalmacrous

API URLhttps://x402.hexl.dev/v1/gov/treasury-rates

Integration docs

Example request

{}

Example response

{
  "recordDate": "2026-04-30",
  "rates": [
    {
      "securityType": "Marketable",
      "security": "Treasury Bills",
      "avgInterestRatePct": 3.696,
      "recordDate": "2026-04-30"
    }
  ]
}

Input schema

{
  "type": "object",
  "required": [],
  "properties": {}
}

Output schema

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