Конвертация ERN в USD

curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://rate-api.com/api/v1/pair/ERN/USD"

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

import requests

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

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

{
    "success": true,
    "pair": {
        "from": "ERN",
        "to": "USD"
    },
    "rate": 0.0667,
    "timestamp": 1790435162,
    "date": "2026-09-26"
}