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Exchange Rates API vs PredScope

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

APIExchange Rates APIHEALTHY88PredScopeHEALTHY97
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms810326
P95 · ms4162621
Authnonenone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs PredScope: common questions

Which is more reliable, Exchange Rates API or PredScope?

Both are neck-and-neck — Exchange Rates API and PredScope 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, Exchange Rates API or PredScope?

PredScope has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus PredScope at 326 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 Exchange Rates API and PredScope need an API key?

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

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

Yes — both Exchange Rates API and PredScope 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 Exchange Rates API and PredScope free for commercial use?

Exchange Rates API has unclear commercial terms, and PredScope 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.