ToolVet
77trust / 100

Fx

by tokenguard in Onchain & crypto

x402 APIPassing, checked 3 h ago

What is this amount worth in another currency right now? ECB-backed fiat rates across 160+ currencies with the conversion already applied, and an automatic second source if the primary is down. Fiat-to-fiat, distinct from crypto /price.

POST
https://eltociear-tokenguard.hf.space/fx
Price
$0.02
per call in USDC
Uptime
100%
last 30 days
Response time
305 ms
398 ms slowest 5%
Last check
Passed
3 h ago, next any minute now

Run a free test callHow to call it

Reliability

All checks passedSome failedAll failedNot checked

Status and outage history · Atom feed

How to call it

POST https://eltociear-tokenguard.hf.space/fx

Each call costs $0.02 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://eltociear-tokenguard.hf.space/fx
content-type: application/json

{
  "amount": 100,
  "base": "USD",
  "symbols": "JPY,EUR,GBP"
}

Parameters

ParameterTypeRequiredDescription
amountnumberNoAmount to convert (optional, default 1)
basestringNoBase currency ISO code (default USD)
symbolsstringNoComma-separated target codes (optional, all if omitted)

Example response

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

{
  "amount": 100,
  "as_of": "2026-06-25",
  "base": "USD",
  "converted": {
    "EUR": 88.168,
    "GBP": 75.986,
    "JPY": 16185
  },
  "count": 3,
  "rates": {
    "EUR": 0.88168,
    "GBP": 0.75986,
    "JPY": 161.85
  },
  "source": "frankfurter.dev (ECB)"
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.02.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://eltociear-tokenguard.hf.space/fx' \
  -H 'content-type: application/json' \
  --data-raw '{"amount":100,"base":"USD","symbols":"JPY,EUR,GBP"}'

# 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://eltociear-tokenguard.hf.space/fx' \
  -H 'content-type: application/json' \
  --data-raw '{"amount":100,"base":"USD","symbols":"JPY,EUR,GBP"}' \
  | 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 $0.02 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.02" });
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 $0.02 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Feltociear-tokenguard.hf.space%2Ffx&method=POST
const res = await pay("https://eltociear-tokenguard.hf.space/fx", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "amount": 100,
    "base": "USD",
    "symbols": "JPY,EUR,GBP"
  }),
});
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 $0.02 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.02"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://eltociear-tokenguard.hf.space/fx",
        json={
            "amount": 100,
            "base": "USD",
            "symbols": "JPY,EUR,GBP",
        },
    )
    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
3 h agoPassed402310 ms$0.02
7 h agoPassed402256 ms$0.02
12 h agoPassed402399 ms$0.02
16 h agoPassed402353 ms$0.02
20 h agoPassed402354 ms$0.02
Show 10 older checks
24 h agoPassed402294 ms$0.02
27 h agoPassed402330 ms$0.02
31 h agoPassed402398 ms$0.02
35 h agoPassed402339 ms$0.02
39 h agoPassed402352 ms$0.02
42 h agoPassed402193 ms$0.02
46 h agoPassed402297 ms$0.02
2 days agoPassed402329 ms$0.02
2 days agoPassed402408 ms$0.02
2 days agoPassed402333 ms$0.02