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Marketstack vs World Trading Data

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

APIMarketstackHEALTHY93World Trading DataHEALTHY94
Uptime · 30d
Uptime · 90d100%99.02%
Uptime · 30d100%98.3%
P50 · ms470423
P95 · ms4068920
AuthapiKeyapiKey
CORSnono
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key may be required for production
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Marketstack vs World Trading Data: common questions

Which is more reliable, Marketstack or World Trading Data?

On our scheduled checks, Marketstack leads on measured uptime — Marketstack 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, Marketstack or World Trading Data?

World Trading Data has the lower median latency in our checks — Marketstack responds in 470 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 Marketstack and World Trading Data need an API key?

Both ask you to authenticate — Marketstack uses an API key and World Trading Data 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 Marketstack and World Trading Data from the browser?

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

Are Marketstack and World Trading Data free for commercial use?

Marketstack 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.