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Exchange Rates API vs World Trading Data

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

APIExchange Rates APIHEALTHY88World Trading DataHEALTHY94
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms810423
P95 · ms4162920
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Exchange Rates API vs World Trading Data: common questions

Which is more reliable, Exchange Rates API or World Trading Data?

On our scheduled checks, Exchange Rates API leads on measured uptime — Exchange Rates API at 100% versus World Trading Data at 99.02% 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, Exchange Rates API or World Trading Data?

World Trading Data has the lower median latency in our checks — Exchange Rates API responds in 810 ms versus World Trading Data at 423 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 World Trading Data need an API key?

Exchange Rates API needs no key, while World Trading Data requires a free API key. If you want to start calling without signup, reach for Exchange Rates API first.

Can I call Exchange Rates API and World Trading Data from the browser?

Only Exchange Rates API is browser-friendly — it returns CORS headers over HTTPS. World Trading Data needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are Exchange Rates API and World Trading Data free for commercial use?

Exchange Rates API has unclear commercial terms, and World Trading Data 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.