Fx Rates

{
  "base": "USD",
  "dates": {
    "ARS": "2026-10-15",
    "BRL": "2026-10-15",
    "EUR": "2026-10-16",
    "GBP": "2026-10-16",
    "JPY": "2026-10-16",
    "MXN": "2026-10-16"
  },
  "degraded": false,
  "rates": {
    "ARS": 1512.47,
    "BRL": 5.0379,
    "EUR": 0.89273,
    "GBP": 0.75433,
    "JPY": 158.22,
    "MXN": 18.471
  },
  "readAt": "2026-10-16T06:29:31.190Z",
  "scope": "Daily reference rates, not intraday quotes; each rate carries its own reference date.",
  "sources": [
    {
      "date": "2026-10-16",
      "license": "MIT",
      "name": "Frankfurter v2 (central-bank reference rates)",
      "url": "https://api.frankfurter.dev/v2/rates?base=USD"
    }
  ],
  "unavailable": []
}

# bash or zsh: see the payment challenge. Nothing is charged.
curl -sS -g -i -X POST 'https://tienda.textokit.store/api/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"base":"USD","quotes":"EUR,GBP,BRL,ARS,MXN,JPY"}'

# 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://tienda.textokit.store/api/fx-rates' \
  -H 'content-type: application/json' \
  --data-raw '{"base":"USD","quotes":"EUR,GBP,BRL,ARS,MXN,JPY"}' \
  | 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 $0.001 per call.
const client = new x402Client().setSpendControls({ maxAmountPerPayment: "$0.001" });
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 $0.001 per payment. GET https://toolvet.app/api/v1/check?url=https%3A%2F%2Ftienda.textokit.store%2Fapi%2Ffx-rates&method=POST
const res = await pay("https://tienda.textokit.store/api/fx-rates", {
  method: "POST",
  headers: { "content-type": "application/json" },
  body: JSON.stringify({
    "base": "USD",
    "quotes": "EUR,GBP,BRL,ARS,MXN,JPY"
  }),
});
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 $0.001 per call.
client = x402ClientSync().set_spend_controls({"max_amount_per_payment": "$0.001"})
register_exact_evm_client(client, EthAccountSigner(Account.from_key(os.environ["EVM_PRIVATE_KEY"])))

with x402_requests(client) as session:
    res = session.post(
        "https://tienda.textokit.store/api/fx-rates",
        json={
            "base": "USD",
            "quotes": "EUR,GBP,BRL,ARS,MXN,JPY",
        },
    )
    print(res.status_code, res.text)