Currencylayer vs Marketstack
Same instrument, two spec sheets — measured, not claimed.
Currencylayer vs Marketstack: common questions
Which is more reliable, Currencylayer or Marketstack?
Both are neck-and-neck — Currencylayer and Marketstack each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.
Which is faster, Currencylayer or Marketstack?
Marketstack has the lower median latency in our checks — Currencylayer responds in 511 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 Currencylayer and Marketstack need an API key?
Both ask you to authenticate — Currencylayer uses an API key and Marketstack 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 Currencylayer and Marketstack from the browser?
Neither sends browser-friendly CORS headers reliably, so call Currencylayer and Marketstack from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.
Are Currencylayer and Marketstack free for commercial use?
Currencylayer has unclear commercial terms, 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.