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). Send GET /api/treasury-avg-rates with no input and pay $0.005 per call over x402 or MPP (there is no free tier). It returns a JSON object with recordDate and rates.

Public domain, no key. No params - returns the most recent reporting month.

Category: Live public data · Tags: treasury interest-rates bills notes bonds tips frn macro

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Parameters

Average interest rates on Treasury securities takes no parameters.

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for treasury-avg-rates; any x402 v2 or MPP client pays it and retries.

Example response

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

From an MCP client

catalog.call {
  "slug": "treasury-avg-rates",
  "params": {}
}

The hosted connector at https://agent402.tools/mcp needs a payment for treasury-avg-rates; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• There is no input to get wrong: any request to /api/treasury-avg-rates runs the tool.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A POST with a JSON body to /api/treasury-avg-rates is served as this GET, with the body as the input.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

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

Part of these workflows

Average interest rates on Treasury securities is one step in these 2 skill packs, each sold as a single call:

• Macro dashboard refresh - The full macro + crypto dashboard in one call: 5 FRED series, 5 Treasury reads, yield-curve spread, crypto market/trending/global, and live gas - the 14-tool basket recurring buyers refresh every cycle, bundled below its a la carte price.
• Yield dashboard - Current yield curve snapshot: full Treasury curve, key spreads, and average rates in one call.

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