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MediaCaption API vs Nebulum Mars Rovers API

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

APIMediaCaption APIDOCS OK100Nebulum Mars Rovers APIDYING88
Uptime · 30d
Uptime · 90d100%91.7%
Uptime · 30d100%75.0%
P50 · ms1016454
P95 · ms21011417
AuthapiKeynone
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useyesunclear
Data licenseUnverified
Free tier10 credits when you sign upFree — limits not published
Rate limit60 req/minUnpublished
In directory since2026-07-182026-07-05
operationalpartialdownno data

MediaCaption API vs Nebulum Mars Rovers API: common questions

Which is more reliable, MediaCaption API or Nebulum Mars Rovers API?

On our scheduled checks, MediaCaption API leads on measured uptime — MediaCaption API at 100% versus Nebulum Mars Rovers API at 91.7% 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, MediaCaption API or Nebulum Mars Rovers API?

Nebulum Mars Rovers API has the lower median latency in our checks — MediaCaption API responds in 1016 ms versus Nebulum Mars Rovers API at 454 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 MediaCaption API and Nebulum Mars Rovers API need an API key?

Nebulum Mars Rovers API needs no key, while MediaCaption API requires a free API key. If you want to start calling without signup, reach for Nebulum Mars Rovers API first.

Can I call MediaCaption API and Nebulum Mars Rovers API from the browser?

Only MediaCaption API is browser-friendly — it returns CORS headers over HTTPS. Nebulum Mars Rovers API needs a server-side call or proxy, so factor that into which one fits a front-end project.

Are MediaCaption API and Nebulum Mars Rovers API free for commercial use?

MediaCaption API allows commercial use on its free tier, and Nebulum Mars Rovers API 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.