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Fixer API vs Lookup.im API

Same instrument, two spec sheets — measured, not claimed.

APIFixer APIHEALTHY96Lookup.im APIHEALTHY89
Uptime · 30d
Uptime · 90d99.44%97.8%
Uptime · 30d100%98.3%
P50 · ms286180
P95 · ms8303581
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — API key requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Fixer API vs Lookup.im API: common questions

Which is more reliable, Fixer API or Lookup.im API?

On our scheduled checks, Fixer API leads on measured uptime — Fixer API at 99.44% versus Lookup.im API at 97.8% 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, Fixer API or Lookup.im API?

Lookup.im API has the lower median latency in our checks — Fixer API responds in 286 ms versus Lookup.im API at 180 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 Fixer API and Lookup.im API need an API key?

Both ask you to authenticate — Fixer API uses an API key and Lookup.im API 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 API and Lookup.im API from the browser?

Neither sends browser-friendly CORS headers reliably, so call Fixer API and Lookup.im API from a server or proxy rather than client-side. The CORS and HTTPS rows above show exactly what we detected for each.

Are Fixer API and Lookup.im API free for commercial use?

Fixer API has unclear commercial terms, and Lookup.im API 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.