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Crates.io vs RSQ API

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

APICrates.ioHEALTHY90RSQ APIHEALTHY91
Uptime · 30d
Uptime · 90d99.02%100%
Uptime · 30d100%100%
P50 · ms458783
P95 · ms13171387
Authnonenone
CORSyesyes
HTTPSyesno
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree — limits not publishedFree — limits not published
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Crates.io vs RSQ API: common questions

Which is more reliable, Crates.io or RSQ API?

On our scheduled checks, RSQ API leads on measured uptime — Crates.io at 99.02% versus RSQ API at 100% 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, Crates.io or RSQ API?

Crates.io has the lower median latency in our checks — Crates.io responds in 458 ms versus RSQ API at 783 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 Crates.io and RSQ API need an API key?

Neither needs a paid key — Crates.io is callable with no signup, and RSQ API is callable with no signup. Both are quick to prototype with; rate limits still apply.

Can I call Crates.io and RSQ API from the browser?

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

Are Crates.io and RSQ API free for commercial use?

Crates.io has unclear commercial terms, and RSQ 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.