Fixer API vs Frankfurter API

Two free Currency Exchange APIs compared on access, reliability and developer ratings, using data from our daily health checks.

The verdict

Choose Fixer API if you want faster responses.
Choose Frankfurter API if you want to start without an API key, to call it from browser JavaScript, HTTPS.

Side by side

	Fixer API	Frankfurter API
What it does	Exchange rates and currency conversion.	Exchange rates, currency conversion and time series.
Provider	Fixer API	Frankfurter
API key	Required	Not needed
HTTPS	No	Yes
CORS (browser calls)	Unknown	Yes
Status today	Online · 991 ms	Online · 1501 ms
Uptime (30 days)	Up	Up
Developer rating	Not rated yet	Not rated yet
Price	Free / free tier	Free / free tier

Fixer docs ↗Frankfurter docs ↗

Fixer API

Exchange rates and currency conversion.

Access current and historical foreign exchange rates with Fixer API. Get free, lightweight currency conversion for your applications. Click now.

Ratings, reviews and FAQ →

Frankfurter API

Exchange rates, currency conversion and time series.

Free, open-source exchange rates API for 223 currencies. Current and historical rates from 105 central banks and official sources. No API key required.

Strengths

No API key needed
Callable from the browser (CORS)
HTTPS

Ratings, reviews and FAQ →

How to choose between them

Prototyping or a tutorial? Pick the one that needs no API key.
Calling from a web page? You need CORS. Otherwise route requests through your own server or a serverless function.
Going to production? Favour HTTPS, a strong uptime record and a provider with clear rate limits and terms. Check each API's docs before you commit.
Still unsure? Both are free to try: send one request to each and compare the data you get back.

Fixer vs Frankfurter FAQ

Which needs an API key, Fixer API or Frankfurter API?

Fixer API requires an API key; Frankfurter API doesn't, so Frankfurter API is quicker to try.

Which can I call from the browser?

Frankfurter API supports CORS, so front-end JavaScript can call it directly. Call the other from a server.

More comparisons

Fixer API alternatives · Frankfurter API alternatives · best Currency Exchange APIs