Exchange Rate API Quickstart

1. Request two rates

This asks for the euro and British pound against the US dollar. Change the base in the path or the comma-separated symbols list to get different currencies.

curl -fsS --max-time 10 "https://api.exchangerate.dev/v1/latest/USD?symbols=EUR,GBP"

from urllib.request import Request, urlopen
import json

# Identify your application explicitly when calling the API.
request = Request("https://api.exchangerate.dev/v1/latest/USD?symbols=EUR,GBP", headers={"User-Agent": "exchangerate-docs/1.0"})
with urlopen(request, timeout=10) as response:
    data = json.load(response)

print(data["rates"]["EUR"])

const response = await fetch("https://api.exchangerate.dev/v1/latest/USD?symbols=EUR,GBP", {
  signal: AbortSignal.timeout(10_000),
});
if (!response.ok) throw new Error(`HTTP ${response.status}`);
const data = await response.json();
console.log(data.rates.EUR);

{
  "result": "success",
  "base": "USD",
  "source": "live",
  "sources": {
    "EUR": "live",
    "GBP": "live"
  },
  "market_session": "open",
  "timestamp": "2026-06-15T12:00:00Z",
  "data_updated_at": "2026-06-15T12:00:00Z",
  "effective_at": {
    "EUR": "2026-06-15T12:00:00Z",
    "GBP": "2026-06-15T12:00:00Z"
  },
  "rates": {
    "EUR": 0.86207,
    "GBP": 0.74627
  },
  "derived_symbols": [],
  "notice": "Indicative rates, not for settlement."
}

2. Read the response

The response uses this JSON shape. The rates below are an example, so your numbers and timestamps will be different.

{
  "result": "success",
  "base": "USD",
  "source": "live",
  "sources": {
    "EUR": "live",
    "GBP": "live"
  },
  "market_session": "open",
  "timestamp": "2026-06-15T12:00:00Z",
  "data_updated_at": "2026-06-15T12:00:00Z",
  "effective_at": {
    "EUR": "2026-06-15T12:00:00Z",
    "GBP": "2026-06-15T12:00:00Z"
  },
  "rates": {
    "EUR": 0.86207,
    "GBP": 0.74627
  },
  "derived_symbols": [],
  "notice": "Indicative rates, not for settlement."
}

Use rates.EUR and rates.GBP in your code. If you show freshness to users, keep source, market_session, and effective_at for each displayed currency.

3. Add a key when you need account quota

Anonymous requests are for evaluation and are limited by IP. A free account gives you an account-attributed monthly quota. Keep the key on your server, not in public browser JavaScript.

curl "https://api.exchangerate.dev/v1/latest/USD?symbols=EUR,GBP"   -H "Authorization: Bearer YOUR_KEY"

Create a free key, then replace YOUR_KEY. The X-API-Key header also works when a connector cannot set an Authorization header.

Where to go next

• Convert an amount with a GET or batch POST request.
• Pull historical data for one day or a date range.
• Understand source and freshness before putting a rate in production.