Российский рубль (RUB) ₽

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://rate-api.com/api/v1/latest?base=RUB"

fetch('https://rate-api.com/api/v1/latest?base=RUB', {
  headers: { Authorization: 'Bearer YOUR_API_KEY' },
})
  .then((res) => res.json())
  .then((data) => console.log(`1 RUB = ${data.rates.USD} USD`));

import requests

res = requests.get(
    "https://rate-api.com/api/v1/latest?base=RUB",
    headers={"Authorization": "Bearer YOUR_API_KEY"},
    timeout=10,
)
data = res.json()
print(f"1 RUB = {data['rates']['USD']} USD")

<?php
$ch = curl_init('https://rate-api.com/api/v1/latest?base=RUB');
curl_setopt_array($ch, [
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => ['Authorization: Bearer YOUR_API_KEY'],
]);
$data = json_decode(curl_exec($ch), true);
echo "1 RUB = {$data['rates']['USD']} USD\n";