Currency Converter API: Convert Amounts with a Simple Convert Endpoint

Quickstart: convert an amount in one request

The fastest way to evaluate a currency converter API is to run a single conversion end‑to‑end: request → response → money formatting → user display. Below is a practical example you can adapt.

Example request (cURL)

curl -X GET "https://api.fieba.net/v1/convert?from=USD&to=EUR&amount=199.99" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Accept: application/json"

Example response (JSON)

{
  "request": {
    "from": "USD",
    "to": "EUR",
    "amount": 199.99,
    "date": "latest"
  },
  "result": {
    "rate": 0.91842,
    "converted_amount": 183.66,
    "rate_timestamp": 1767964027,
    "precision": 2
  },
  "meta": {
    "provider": "Fieba",
    "format": "decimal",
    "disclaimer": "Rates are indicative. Final settlement rates may vary due to fees and spreads."
  }
}

If you’re evaluating providers, focus on three things during quickstart: (1) how easy it is to integrate, (2) whether the result is transparent enough for product/finance indicated pricing, and (3) whether performance patterns (like caching) are documented and encouraged.

Best use cases for a Currency Converter API

Conversion isn’t just “nice to have”. In most international products, it’s a trust mechanism. Users abandon when totals feel inconsistent or surprise fees appear late. A strong currency API converter implementation helps you:

If your product has a “money moment” (cart totals, subscription upgrade, booking confirmation, invoice approval), you want conversions to feel stable, transparent, and fast. That’s where good API design and good product messaging reinforce each other.

Looking for a user-facing tool instead of an API? You can also link to your existing pages (great for internal linking): Currency Converter and Exchange Rates. (Adjust URLs to match your site’s existing slugs.)

Integration patterns that scale (and don’t spike your API bill)

The fastest way to break a conversion feature is to call the API on every page render for every user. The fastest way to fix it is to design caching and rate usage intentionally. Here are common patterns that work well for a currency conversion rate API.

JavaScript example (Node / server-side)

// Example server-side conversion (Node.js)
// Replace URL and auth scheme with your Fieba credentials.

async function convertCurrency({ from, to, amount }) {
  const url = new URL("https://api.fieba.net/v1/convert");
  url.searchParams.set("from", from);
  url.searchParams.set("to", to);
  url.searchParams.set("amount", String(amount));

  const res = await fetch(url.toString(), {
    headers: {
      "Authorization": "Bearer YOUR_API_KEY",
      "Accept": "application/json"
    }
  });

  if (!res.ok) {
    const err = await res.text();
    throw new Error(`Conversion failed (${res.status}): ${err}`);
  }

  const data = await res.json();
  return data;
}

Python example

import requests

def convert_currency(from_ccy: str, to_ccy: str, amount: float) -> dict:
    url = "https://api.fieba.net/v1/convert"
    params = {"from": from_ccy, "to": to_ccy, "amount": amount}
    headers = {"Authorization": "Bearer YOUR_API_KEY", "Accept": "application/json"}

    r = requests.get(url, params=params, headers=headers, timeout=10)
    r.raise_for_status()
    return r.json()