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Crates.io vs Poptin API

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

APICrates.ioHEALTHY94Poptin APIREACHABLE100
Uptime · 30d
Uptime · 90d100%100%
Uptime · 30d100%100%
P50 · ms279698
P95 · ms11541705
AuthnoneapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified
Free tierFree — limits not published
Rate limitUnpublished120 req/window · 119 remaining
In directory since2026-07-052026-10-04
operationalpartialdownno data

Crates.io vs Poptin API: common questions

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

Both are neck-and-neck — Crates.io and Poptin API each measure 100% uptime over 90 days on our probe schedule. Reliability here is verified from our own scheduled checks; use the 30-day bars above to see which has been steadier lately.

Which is faster, Crates.io or Poptin API?

Crates.io has the lower median latency in our checks — Crates.io responds in 279 ms versus Poptin API at 698 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 Poptin API need an API key?

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

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

Yes — both Crates.io and Poptin API 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 Crates.io and Poptin API free for commercial use?

Crates.io has unclear commercial terms, and Poptin 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.