Forex API for Developers

What Developers Build with Forex Data

Exchange rate data powers a wide range of developer projects -- from personal side projects to production financial tools. Here are the most common use cases we see from developers using Exchange Rate API.

Why Developers Choose Exchange Rate API

Developer experience matters. Exchange Rate API is built by developers, for developers. No bloated enterprise sales process, no opaque pricing, no XML responses from 2008. Just clean JSON, simple auth, and official SDKs.

• Real-time data -- rates updated every 60 seconds from Reuters/Refinitiv interbank feeds
• Historical rates -- query past rates for any date with 1D, 7D, 30D, and 1Y period support
• Simple Bearer auth -- one API key, one header, no OAuth dance
• Official SDKs -- JavaScript/Node.js, Python, PHP, and React packages maintained by us
• CORS enabled -- call directly from browser apps and SPAs
• 160+ currencies -- major pairs, exotics, and emerging market currencies
• Any base currency -- not locked to USD or EUR on any plan, including free
• Clean JSON responses -- no XML, no SOAP, no nested wrapper objects

Key API Endpoints for Forex Development

Code Example: Historical Rate Chart Data

This example fetches 30 days of EUR/USD historical data and formats it for a chart library like Chart.js or D3.

import ExchangeRateAPI from 'exchange-rateapi';

const client = new ExchangeRateAPI('YOUR_API_KEY');

async function getChartData(base, target, period) {
  // Fetch historical rates for the given period
  const history = await client.getHistorical({
    base,
    target,
    period  // '1D', '7D', '30D', or '1Y'
  });

  // Format for chart libraries (array of { date, rate } objects)
  const chartData = history.rates.map(point => ({
    date: point.date,
    rate: point.rate,
    label: `${base}/${target}`
  }));

  return chartData;
}

// Get 30 days of EUR/USD data for a line chart
const data = await getChartData('EUR', 'USD', '30D');
console.log(`Fetched ${data.length} data points`);
console.log(data[0]);
// { date: '2026-04-12', rate: 1.0842, label: 'EUR/USD' }

// Build an alert: notify when rate crosses a threshold
async function checkRateAlert(base, target, threshold) {
  const current = await client.getRate(base, target);

  if (current.rate >= threshold) {
    console.log(
      `ALERT: ${base}/${target} is now ${current.rate} (threshold: ${threshold})`
    );
    // Trigger notification (webhook, email, Slack, etc.)
  }
}

// Alert when GBP/JPY crosses 195.00
await checkRateAlert('GBP', 'JPY', 195.00);

Combine real-time polling with historical data to build powerful forex tools. Use the latest endpoint for live dashboards and the historical endpoint for trend charts, backtesting, and analytics.