ToolVet
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Tools Yield Curve

by treasury-yield-curve.x402supply.com in Markets & finance

x402 APIPassing, checked 4 h ago

US Treasury par yield curve (1mo to 30yr, percent) for one date, or the latest if omitted. Weekend or holiday dates return the nearest prior business day with a note. Data from U.S. Treasury; not financial advice.

POST
https://treasury-yield-curve.x402supply.com/tools/yield_curve
Price
$0.005
per call in USDC
Uptime
100%
last 30 days
Response time
298 ms
454 ms slowest 5%
Last check
Passed
4 h ago, next any minute now

Run a free test callHow to call it

Reliability

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Status and outage history · Atom feed

How to call it

POST https://treasury-yield-curve.x402supply.com/tools/yield_curve

Each call costs $0.005 in USDC on Base, paid with the request over x402.

Run a free test callOne unpaid request, the way an agent sends it. You see the payment challenge it gets back. Nothing is charged.

Example request

From the listing.

POST https://treasury-yield-curve.x402supply.com/tools/yield_curve
content-type: application/json

{
  "date": "2026-10-04"
}

Parameters

ParameterTypeRequiredDescription
datestringNoYYYY-MM-DD, 1990-01-02 or later, not in the future. Omit for the latest curve

Example response

The provider's example. We can't check it without paying.

Example response, 27 lines
{
  "asOf": "2026-10-09T17:48:01.778Z",
  "date": "2026-10-02",
  "exactMatch": false,
  "note": "No Treasury curve is published for 2026-10-04 (weekend or market holiday). Returning the nearest prior business day, 2026-10-02.",
  "requestedDate": "2026-10-04",
  "source": [
    "https://home.treasury.gov/resource-center/data-chart-center/interest-rates/pages/xml?data=daily_treasury_yield_curve&field_tdr_date_value_month=202610"
  ],
  "unit": "percent",
  "yields": {
    "1.5mo": 4.09,
    "10yr": 5.28,
    "1mo": 4.04,
    "1yr": 4.46,
    "20yr": 5.67,
    "2mo": 4.11,
    "2yr": 4.83,
    "30yr": 5.63,
    "3mo": 4.19,
    "3yr": 4.96,
    "4mo": 4.26,
    "5yr": 5.06,
    "6mo": 4.27,
    "7yr": 5.17
  }
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.005.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://treasury-yield-curve.x402supply.com/tools/yield_curve' \
  -H 'content-type: application/json' \
  --data-raw '{"date":"2026-10-04"}'

# 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 - -X POST 'https://treasury-yield-curve.x402supply.com/tools/yield_curve' \
  -H 'content-type: application/json' \
  --data-raw '{"date":"2026-10-04"}' \
  | grep -i '^payment-required:' | cut -d' ' -f2 | tr -d '\r' | base64 --decode
JavaScript: pay and call
// 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 $0.005 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.005" });
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 $0.005 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftreasury-yield-curve.x402supply.com%2Ftools%2Fyield_curve&method=POST
const res = await pay("https://treasury-yield-curve.x402supply.com/tools/yield_curve", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "date": "2026-10-04"
  }),
});
console.log(res.status, await res.text());
Python: pay and call
# 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 $0.005 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.005"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://treasury-yield-curve.x402supply.com/tools/yield_curve",
        json={
            "date": "2026-10-04",
        },
    )
    print(res.status_code, res.text)

Security scan

No findings

We scan names, descriptions and tool definitions for hidden instructions and other prompt-injection patterns.

Recent checks

WhenResultHTTPTimePrice
4 h agoPassed402315 ms$0.005
9 h agoPassed402241 ms$0.005
13 h agoPassed402313 ms$0.005
17 h agoPassed402177 ms$0.005
21 h agoPassed402484 ms$0.005
Show 10 older checks
26 h agoPassed402264 ms$0.005
30 h agoPassed402403 ms$0.005
33 h agoPassed402325 ms$0.005
37 h agoPassed402174 ms$0.005
41 h agoPassed402168 ms$0.005
45 h agoPassed402313 ms$0.005
2 days agoPassed402263 ms$0.005
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3 days agoPassed402315 ms$0.005