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Deck of Cards vs SuperHeroes

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

APIDeck of CardsNEW—SuperHeroesNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree tier — key may be required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Deck of Cards vs SuperHeroes: common questions

Which is more reliable, Deck of Cards or SuperHeroes?

On our scheduled checks, SuperHeroes leads on measured uptime — Deck of Cards at —% versus SuperHeroes 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 Deck of Cards and SuperHeroes need an API key?

Deck of Cards needs no key, while SuperHeroes requires a free API key. If you want to start calling without signup, reach for Deck of Cards first.

Can I call Deck of Cards and SuperHeroes from the browser?

Yes — both Deck of Cards and SuperHeroes 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 Deck of Cards and SuperHeroes free for commercial use?

Deck of Cards has unclear commercial terms, and SuperHeroes 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.