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Chathuranga Basnayaka
Chathuranga Basnayaka

Posted on • Originally published at allratestoday.com

The Best Free Currency Exchange Rate API in 2026

#currency #api #javascript #python

If you need exchange rate data in your application, your options range from free-with-caveats to expensive-with-everything. Most developers start by searching "free currency API" and end up with a service that caps at 100 requests per month, requires a credit card for signup, or returns stale data cached from yesterday. Then they outgrow it, switch to a paid service, and rewrite their integration.

This article compares the major free currency exchange APIs available in 2026 and explains why AllRatesToday is the best option for most use cases: real-time mid-market rates for 160+ currencies, sourced from Reuters (Refinitiv) and interbank market feeds, with official SDKs and a generous free tier.

Comparing Free Currency APIs in 2026

API Free Tier Currencies Update Frequency Credit Card
AllRatesToday 300 req/month 160+ Real-time (60s) No
ExchangeRate-API 1,500 req/month 160+ Daily Yes (for upgrades)
Open Exchange Rates 1,000 req/month 170+ Hourly Yes
Frankfurter Unlimited 30+ Daily (ECB) No
CurrencyAPI 300 req/month 170+ Daily Yes
Fixer.io 100 req/month 170+ Daily Yes
AbstractAPI 1,000 req/month 150+ Daily Yes

The key differentiators for AllRatesToday: real-time rates updated every 60 seconds (not daily), mid-market rates sourced from Reuters/Refinitiv, official SDKs for three languages, and no credit card required to get started.

Getting Started in 30 Seconds

Sign up at allratestoday.com/register to get your free API key. No credit card required. The free tier includes 300 requests/month across all endpoints.

Fetch exchange rates 

curl -X GET "https://allratestoday.com/api/v1/rates?source=USD&target=EUR" \
  -H "Authorization: Bearer YOUR_API_KEY"
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Response:

{
  "source": "USD",
  "target": "EUR",
  "rate": 0.9234,
  "time": "2026-04-09T12:00:00Z"
}
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Historical rates 

curl -X GET "https://allratestoday.com/api/historical-rates?source=USD&target=EUR&from=2026-01-01&to=2026-03-31" \
  -H "Authorization: Bearer YOUR_API_KEY"
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Historical rates are useful for financial reporting, tax calculations, and charting exchange rate trends over time.

Official SDKs

Unlike most currency APIs that leave you writing raw HTTP calls, AllRatesToday provides official SDKs for the three most popular server-side languages.

JavaScript / TypeScript 

npm install @allratestoday/sdk
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import AllRatesToday from '@allratestoday/sdk';

const client = new AllRatesToday('YOUR_API_KEY');

// Get a single rate
const rate = await client.getRate('USD', 'EUR');
console.log(`1 USD = ${rate} EUR`);

// Convert an amount
const result = await client.convert('USD', 'EUR', 1000);
console.log(`$1,000 = €${result.result}`);

// Historical rates
const history = await client.getHistoricalRates('USD', 'EUR', '30d');
history.rates.forEach(point => {
  console.log(`${point.time}: ${point.rate}`);
});
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npm: @allratestoday/sdk — View on GitHub

Python 

pip install allratestoday
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from allratestoday import AllRatesToday

client = AllRatesToday("YOUR_API_KEY")

# Get exchange rate
rate = client.get_rate("USD", "EUR")
print(f"1 USD = {rate} EUR")

# Convert amount
result = client.convert("USD", "EUR", 1000)
print(f"$1,000 = €{result['result']}")

# Historical rates
history = client.get_historical_rates("USD", "EUR", "30d")
for point in history["rates"]:
    print(f"{point['time']}: {point['rate']}")
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PyPI: allratestoday — View on GitHub

PHP 

composer require allratestoday/sdk
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use AllRatesToday\AllRatesToday;

$client = new AllRatesToday('YOUR_API_KEY');

// Get exchange rate
$rate = $client->getRate('USD', 'EUR');
echo "1 USD = {$rate[0]['rate']} EUR\n";

// Convert amount
$result = $client->convert('USD', 'EUR', 100);
echo "$100 = €{$result['result']}\n";

// Historical rates
$history = $client->getHistoricalRates('USD', 'EUR', '30d');
foreach ($history['rates'] as $point) {
    echo "{$point['time']}: {$point['rate']}\n";
}
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Packagist: allratestoday/sdk — View on GitHub

React Price Display Component

A drop-in React component that shows prices in multiple currencies:

import { useState, useEffect } from 'react';
import AllRatesToday from '@allratestoday/sdk';

const client = new AllRatesToday('YOUR_API_KEY');

function useExchangeRate(from, to) {
  const [rate, setRate] = useState(null);

  useEffect(() => {
    client.getRate(from, to).then(setRate);
  }, [from, to]);

  return rate;
}

function PriceDisplay({ amount, from, to }) {
  const rate = useExchangeRate(from, to);

  if (!rate) return <span>Loading...</span>;

  return (
    <span>
      {(amount * rate).toFixed(2)} {to}
    </span>
  );
}

// Usage: <PriceDisplay amount={99.99} from="USD" to="EUR" />
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Why AllRatesToday Over Other APIs?

  • Real-time rates: Updated every 60 seconds from Reuters/Refinitiv and interbank feeds. Most free APIs only update once daily from the ECB.
  • Mid-market rates: The true exchange rate between currencies, without any bank markup. This is the rate financial professionals reference.
  • 160+ currencies: Major, minor, and exotic currency pairs. Far more than the 30 currencies offered by ECB-only services like Frankfurter.
  • Official SDKs: Production-ready libraries for JavaScript, Python, and PHP. Install from npm, PyPI, or Packagist and start coding in minutes.
  • Historical data: Access historical exchange rates for charting, reporting, and reconciliation.
  • No credit card: The free tier requires no payment information. Upgrade only when you need to.

Data Source and Accuracy

AllRatesToday sources its exchange rates from Reuters (Refinitiv) and interbank market feeds via the Wise (TransferWise) infrastructure. These are mid-market rates — the real exchange rate between currencies before any bank markup is applied.

This is the same data used by financial institutions and platforms like Google Finance, XE, and Bloomberg for their rate displays.

Pricing

Plan Requests/Month Price
Free 300 Free
Small 5,000 €4.99/mo
Medium 10,000 €9.99/mo
Large 100,000 €49.99/mo

Quick Reference

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