Average interest rates on Treasury securities

Latest average interest rates the US Treasury is paying by security type (Bills, Notes, Bonds, TIPS, FRNs, marketable vs non-marketable). Public domain, no key. No params — returns the most recent reporting month.

Input

No parameters.

Example output

{
  "recordDate": "2026-05-31",
  "rates": [
    {
      "securityType": "Marketable",
      "security": "Treasury Notes",
      "avgInterestRatePct": 2.85
    }
  ]
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/treasury-avg-rates"

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/treasury-avg-rates");

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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