Free Exchange Rate API & Currency Widget

Free exchange rate API with live mid-market rates for 150+ currencies, plus a one-line embeddable converter widget. Free tier — 300 requests/month, no credit card.

Free Exchange Rate API & Currency Widget

Live mid-market rates for 150+ currencies from the AllRatesToday API, plus a one-line embeddable converter widget. Free tier — 300 requests/month, no credit card. Grab a free API key to start.

The endpoint

Pass your API key via an Authorization: Bearer header or a ?key= query param:

curl "https://allratestoday.com/api/rate?source=USD&target=EUR&key=art_live_your_key"

Response:

{ "rate": 0.864566, "source": "refinitiv" }

• Free API key — 300 requests/month, no credit card
• 150+ currencies — any ISO 4217 pair via source and target
• Live mid-market rates — same data source as the paid tiers
• CORS enabled (Access-Control-Allow-Origin: *) — call it straight from the browser

Quick examples

JavaScript

// Works in the browser too — the endpoint sends CORS headers.
const res = await fetch(
  'https://allratestoday.com/api/rate?source=USD&target=EUR&key=art_live_your_key'
);
const { rate } = await res.json();
console.log(`1 USD = ${rate} EUR`);

Python

import requests

r = requests.get(
    "https://allratestoday.com/api/rate",
    params={"source": "USD", "target": "EUR", "key": "art_live_your_key"},
)
print(f"1 USD = {r.json()['rate']} EUR")

Want a ready-made UI instead? The embeddable currency converter widget uses this same endpoint — just add your data-api-key.

Fair use

Each key has a monthly request quota (300 on the free plan). Cache responses where you can — mid-market rates don't change every second, so a short cache keeps you comfortably under your limit.

Paid plans

Your free key includes usage stats in your dashboard plus the full API: authenticated rates, historical data, and the complete reference. When you need higher limits, paid tiers scale up — see pricing.

Attribution (appreciated)

Not required, but crediting the data source is always appreciated — anywhere visible is fine (footer, about page, or README):

• HTML: <a href="https://allratestoday.com">Rates by AllRatesToday</a>
• Markdown: Rates by [AllRatesToday](https://allratestoday.com)
• Plain text (apps, slides): Exchange rates by AllRatesToday — allratestoday.com