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");

Part of these workflows

This tool is one step in 5 curated multi-tool workflows - agents can fetch the whole sequence as an MCP prompt or call https://agent402.tools/api/skill-packs/{slug}/prompt.

• Fixed-income desk - Read the rate environment and price a bond in one workflow: the live Treasury curve, the recession-signal spread, inflation context, then price and yield a specific coupon bond at current rates.
• Macro economics - Pull the canonical US macro dataset - yield curve, CPI, unemployment, fed funds, Sahm rule - without an API key.
• 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.
• Macro backdrop snapshot - The 'is the economic backdrop you're modeling against still current?' pack. Pull the canonical macro signals - CPI year-over-year, unemployment, fed funds, the Treasury yield curve, a G10 FX dashboard, the Sahm Rule recession indicator, and the next scheduled economic releases - in one composed workflow. Seven egress tools, one composite snapshot the agent can cite before doing any forecast or investment math.
• Yield dashboard - Current yield curve snapshot: full Treasury curve, key spreads, and average rates in one call.

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