US Treasury daily yield curve

Latest US Treasury daily constant-maturity yields (1mo, 3mo, 6mo, 1y, 2y, 3y, 5y, 7y, 10y, 20y, 30y) as clean JSON. Source: FRED DGS* series (St. Louis Fed), public domain, no key. No params — always returns the most recent published curve.

Input

No parameters.

Example output

{
  "recordDate": "2026-06-12",
  "mo1": 5.42,
  "mo3": 5.39,
  "yr1": 4.91,
  "yr2": 4.78,
  "yr5": 4.45,
  "yr10": 4.51,
  "yr30": 4.68
}

Try it — see the 402 challenge (free)

curl -i "https://agent402.tools/api/treasury-yield-curve"

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-yield-curve");

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

Part of these workflows

This tool is one step in a curated multi-tool workflow — agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• Macro economics — Pull the canonical US macro dataset — yield curve, CPI, unemployment, fed funds, Sahm rule — without an API key.

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