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SpaceTradersAPI vs Zelda

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

APISpaceTradersAPINEW—ZeldaNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree — limits not published
Rate limitRetry-After: 1sUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

SpaceTradersAPI vs Zelda: common questions

Which is more reliable, SpaceTradersAPI or Zelda?

On our scheduled checks, Zelda leads on measured uptime — SpaceTradersAPI at —% versus Zelda 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 SpaceTradersAPI and Zelda need an API key?

Zelda needs no key, while SpaceTradersAPI requires a free API key. If you want to start calling without signup, reach for Zelda first.

Can I call SpaceTradersAPI and Zelda from the browser?

Yes — both SpaceTradersAPI and Zelda 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 SpaceTradersAPI and Zelda free for commercial use?

SpaceTradersAPI has unclear commercial terms, and Zelda 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.