Treasury Yields

{
  "as_of": "2026-05-29T00:00:00.000Z",
  "count": 1,
  "maturities": [
    "1mo",
    "1.5mo",
    "2mo",
    "3mo",
    "4mo",
    "6mo",
    "1yr",
    "2yr",
    "3yr",
    "5yr",
    "7yr",
    "10yr",
    "20yr",
    "30yr"
  ],
  "rates": [
    {
      "date": "2026-05-29",
      "rates": {
        "1.5mo": 3.71,
        "10yr": 4.19,
        "1mo": 3.72,
        "1yr": 3.47,
        "20yr": 4.81,
        "2mo": 3.66,
        "2yr": 3.47,
        "30yr": 4.86,
        "3mo": 3.65,
        "3yr": 3.55,
        "4mo": 3.62,
        "5yr": 3.74,
        "6mo": 3.58,
        "7yr": 3.95
      }
    }
  ],
  "series": "daily_treasury_par_yield_curve",
  "source": "us_treasury",
  "unit": "percent"
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i 'https://x402stock.xyz/api/v1/treasury-yields?limit=1'

# x402 v2 sends the challenge base64-encoded in the PAYMENT-REQUIRED header (v1 sends it in the body).
# To read the header:
curl -sS -g -o /dev/null -D - 'https://x402stock.xyz/api/v1/treasury-yields?limit=1' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode

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

// Pays at most $0.01 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.01" });
registerExactEvmScheme(client, { signer: privateKeyToAccount(process.env.EVM_PRIVATE_KEY) });
const pay = wrapFetchWithPayment(fetch, client);

// Not sure it's safe to pay? ToolVet checks it first for $0.005. Pay for that from a separate
// client: this one is capped at $0.01 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fx402stock.xyz%2Fapi%2Fv1%2Ftreasury-yields
const res = await pay("https://x402stock.xyz/api/v1/treasury-yields?limit=1");
console.log(res.status, await res.text());

# pip install "x402[requests,evm]"
import os
from eth_account import Account
from x402 import x402ClientSync
from x402.http.clients import x402_requests
from x402.mechanisms.evm import EthAccountSigner
from x402.mechanisms.evm.exact.register import register_exact_evm_client

# Pays at most $0.01 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.01"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.get("https://x402stock.xyz/api/v1/treasury-yields?limit=1")
    print(res.status_code, res.text)