Fixer vs Tax Data
Same instrument, two spec sheets — measured, not claimed.
Fixer vs Tax Data: common questions
Which is more reliable, Fixer or Tax Data?
On our scheduled checks, Tax Data leads on measured uptime — Fixer at —% versus Tax Data at —% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Do Fixer and Tax Data need an API key?
Both ask you to authenticate — Fixer uses an API key and Tax Data uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.
Can I call Fixer and Tax Data from the browser?
Yes — both Fixer and Tax Data send CORS headers over HTTPS, so front-end code can fetch either directly with no backend proxy. That makes them easy to swap in a client-side app while you compare responses.
Are Fixer and Tax Data free for commercial use?
Fixer has unclear commercial terms, and Tax Data has unclear commercial terms. We track service terms and the data license as separate fields — see the Commercial use and Data license rows above, and confirm both before shipping either in a paid product.