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Frankfurter API vs Fulusly API

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

The verdict

  • Choose Frankfurter API if its data fits your use case better; on access and reliability it's level with Fulusly API.
  • Choose Fulusly API if you want faster responses.

Side by side

Frankfurter APIFulusly API
What it doesExchange rates, currency conversion and time series.Exchange rates for 144 currencies with daily history back to the 1990s, English and Arabic.
ProviderFrankfurterFulusly
API keyNot neededNot needed
HTTPSYesYes
CORS (browser calls)YesYes
Status todayOnline · 1501 msOnline · 486 ms
Uptime (30 days)UpUp
Developer ratingNot rated yetNot rated yet
PriceFree / free tierFree / free tier
Frankfurter docs ↗Fulusly docs ↗

About each API

Frankfurter logoFrankfurter 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 →

Fulusly logoFulusly API

Exchange rates for 144 currencies with daily history back to the 1990s, English and Arabic.

Free currency-rates JSON API and an embeddable converter widget from Fulusly.

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 (both qualify).
  • 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.

Frankfurter vs Fulusly FAQ

Do Frankfurter API and Fulusly API need an API key?

Neither needs an API key; you can call both straight away.

More comparisons

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