async function fetchRates() {
try {
const [usdRes, eurRes, gbpRes] = await Promise.all([
axios.get('https://api.exchangerate.host/convert?from=', { params: { from: 'USD', to: 'TRY', amount:1, access_key:process.env.EXCHANGE_RATE_API_KEY } }),
axios.get('https://api.exchangerate.host/convert?from=', { params: { from: 'EUR', to: 'TRY', amount:1, access_key:process.env.EXCHANGE_RATE_API_KEY } }),
axios.get('https://api.exchangerate.host/convert?from=', { params: { from: 'GBP', to: 'TRY', amount:1, access_key:process.env.EXCHANGE_RATE_API_KEY } })
]);