ToolVet
78trust / 100

Fx Rates

by agentshelf.syntexa.ch in Markets & finance

x402 APIPassing, checked 28 min ago

Call when an agent needs ECB daily FX rates, an as_of date, and an optional conversion. Send base (default EUR), optional quote such as USD, and optional amount. Returns rates and converted. Source is the Frankfurter ECB feed. Send JSON {"base":"EUR","quote":"USD","amount":10}. Exact $0.002 USDC on Base. Try unpaid POST /v1/sandbox/fx-rates first.

POST
https://agentshelf.syntexa.ch/v1/fx-rates
Price
$0.002
per call in USDC
Uptime
100%
last 30 days
Response time
33 ms
237 ms slowest 5%
Last check
Passed
28 min ago, next any minute now

Run a free test callHow to call it

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Status and outage history · Atom feed

How to call it

POST https://agentshelf.syntexa.ch/v1/fx-rates

Each call costs $0.002 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://agentshelf.syntexa.ch/v1/fx-rates
content-type: application/json

{
  "amount": 10,
  "base": "EUR",
  "quote": "USD"
}

Parameters

ParameterTypeRequiredDescription
amountnumberNoAmount of base to convert into quote. Example: 10. Requires quote. Returns converted plus the per-unit rates map.
basestringNoISO 4217 base currency. Example: EUR. Defaults to EUR (ECB) when omitted. Returns rates and as_of. Pair with quote and amount to convert.
quotestringNoISO 4217 quote currency. Example: USD. Omit it to return the full ECB rate map for base. Required when amount is set.

Example response

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

{
  "amount": 10,
  "as_of": "2026-09-28",
  "base": "EUR",
  "billed": true,
  "converted": 11.4,
  "ok": true,
  "provider": "frankfurter",
  "quote": "USD",
  "rates": {
    "USD": 1.14
  },
  "receipt_id": "rcpt_01EXAMPLE000000000000000",
  "warnings": []
}

Call it from code

The curl command shows the payment challenge. The JavaScript and Python versions pay and call, and never pay more than $0.002.

curl: see the payment challenge
# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://agentshelf.syntexa.ch/v1/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"amount":10,"base":"EUR","quote":"USD"}'

# 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://agentshelf.syntexa.ch/v1/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"amount":10,"base":"EUR","quote":"USD"}' \
  | 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 $0.002 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.002" });
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 $0.002 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Fagentshelf.syntexa.ch%2Fv1%2Ffx-rates&method=POST
const res = await pay("https://agentshelf.syntexa.ch/v1/fx-rates", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "amount": 10,
    "base": "EUR",
    "quote": "USD"
  }),
});
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 $0.002 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.002"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://agentshelf.syntexa.ch/v1/fx-rates",
        json={
            "amount": 10,
            "base": "EUR",
            "quote": "USD",
        },
    )
    print(res.status_code, res.text)

Security scan

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