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Exchange Rates API vs Helium

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

APIExchange Rates APINEW—HeliumNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
Authnonenone
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFirst 50 queries per IP free, no key (paid API key beyond, ~$0.02/query)
Rate limitUnpublished50 free queries per IP subnet
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs Helium: common questions

Which is more reliable, Exchange Rates API or Helium?

On our scheduled checks, Helium leads on measured uptime — Exchange Rates API at —% versus Helium 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 Exchange Rates API and Helium need an API key?

Neither needs a paid key — Exchange Rates API is callable with no signup, and Helium is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Exchange Rates API and Helium from the browser?

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

Are Exchange Rates API and Helium free for commercial use?

Exchange Rates API has unclear commercial terms, and Helium 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.