Frankfurter vs Marketstack
Same instrument, two spec sheets — measured, not claimed.
Frankfurter vs Marketstack: common questions
Which is more reliable, Frankfurter or Marketstack?
On our scheduled checks, Marketstack leads on measured uptime — Frankfurter at 88.2% versus Marketstack at 100% over 90 days. These are our own probe results, not provider claims; the uptime bars above show the day-by-day record for both.
Which is faster, Frankfurter or Marketstack?
Frankfurter has the lower median latency in our checks — Frankfurter responds in 370 ms versus Marketstack at 470 ms (P50). Tail latency (P95) is in the table above; for most workloads the median is the number that shapes how the API feels.
Do Frankfurter and Marketstack need an API key?
Frankfurter needs no key, while Marketstack requires a free API key. If you want to start calling without signup, reach for Frankfurter first.
Can I call Frankfurter and Marketstack from the browser?
Only Frankfurter is browser-friendly — it returns CORS headers over HTTPS. Marketstack needs a server-side call or proxy, so factor that into which one fits a front-end project.
Are Frankfurter and Marketstack free for commercial use?
Frankfurter allows commercial use on its free tier, and Marketstack 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.