ToolVet
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Us Treasury Fx Rates

by Vextorium in Markets & finance

x402 APIFailing, checked 2 h ago

Official US Treasury reporting rates of exchange (quarterly) for about 170 currencies against the US dollar, including many the ECB does not publish (Argentine peso, naira, bolivar...), with history per country.

POST
https://api.vextorium.com/v1/us-treasury-fx-rates
Price
$0.003
per call in USDC
Uptime
0.0%
last 30 days
Response time
-
no timed checks yet
Last check
Failed
2 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Latest check failed 2 h ago: Amount "0.003" is not in atomic token units

Status and outage history · Atom feed

How to call it

POST https://api.vextorium.com/v1/us-treasury-fx-rates

Each call costs $0.003 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://api.vextorium.com/v1/us-treasury-fx-rates
content-type: application/json

{
  "country": "Argentina"
}

Parameters

ParameterTypeRequiredDescription
countrystringNoCountry in English, e.g. Argentina (omit for all)
currencystringNoCurrency name in English, e.g. Peso (optional)

Example response

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

{
  "country": "Argentina",
  "currency": "Peso",
  "historical": [
    {
      "date": "2026-06-30",
      "units_per_usd": 1495
    },
    {
      "date": "2026-03-31",
      "units_per_usd": 1420
    }
  ],
  "last": {
    "date": "2026-06-30",
    "units_per_usd": 1495
  },
  "source": "U.S. Treasury, Treasury Reporting Rates of Exchange (public domain)"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.003.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://api.vextorium.com/v1/us-treasury-fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"country":"Argentina"}'

# 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://api.vextorium.com/v1/us-treasury-fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"country":"Argentina"}' \
  | 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 $0.003 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.003" });
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 $0.003 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fapi.vextorium.com%2Fv1%2Fus-treasury-fx-rates&method=POST
const res = await pay("https://api.vextorium.com/v1/us-treasury-fx-rates", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "country": "Argentina"
  }),
});
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 $0.003 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.003"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://api.vextorium.com/v1/us-treasury-fx-rates",
        json={
            "country": "Argentina",
        },
    )
    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
2 h agoAmount "0.003" is not in atomic token units402116 ms$0.003
7 h agoAmount "0.003" is not in atomic token units402110 ms$0.003
11 h agoAmount "0.003" is not in atomic token units40281 ms$0.003
16 h agoAmount "0.003" is not in atomic token units40281 ms$0.003
21 h agoAmount "0.003" is not in atomic token units402198 ms$0.003
Show 10 older checks
26 h agoAmount "0.003" is not in atomic token units40293 ms$0.003
30 h agoAmount "0.003" is not in atomic token units402128 ms$0.003
34 h agoAmount "0.003" is not in atomic token units40281 ms$0.003
39 h agoAmount "0.003" is not in atomic token units40278 ms$0.003
43 h agoAmount "0.003" is not in atomic token units402128 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40284 ms$0.003
2 days agoAmount "0.003" is not in atomic token units402119 ms$0.003
2 days agoAmount "0.003" is not in atomic token units40280 ms$0.003
3 days agoAmount "0.003" is not in atomic token units40272 ms$0.003
3 days agoAmount "0.003" is not in atomic token units40282 ms$0.003