National Bank of Poland API

// Convert USD to EUR
const response = await fetch(`http://api.nbp.pl/en.html`);
const data = await response.json();
const rate = data.rates?.EUR || data.conversion_rate || data.EUR;
const amount = 100;
const converted = (amount * rate).toFixed(2);
console.log(`$${amount} USD = €${converted} EUR (rate: ${rate})`);

// Multi-currency conversion widget
const response = await fetch(`http://api.nbp.pl/en.html`);
const data = await response.json();
const rates = data.rates || data;
const currencies = ['EUR', 'GBP', 'JPY', 'CAD'];
const usdAmount = 100;
currencies.forEach(cur => {
  const rate = rates[cur] || 0;
  console.log(`$${usdAmount} = ${(usdAmount * rate).toFixed(2)} ${cur}`);
});

// Fetch historical exchange rates
const response = await fetch(`http://api.nbp.pl/en.html`);
const data = await response.json();
const rates = data.rates || data;
console.log('Exchange rates:', rates);
const pairs = Object.entries(rates).slice(0, 5);
pairs.forEach(([currency, rate]) => {
  console.log(`1 USD = ${rate} ${currency}`);
});