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Coinlayer vs OpenSea

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

APICoinlayerNEW—OpenSeaNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeyapiKey
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified
Free tierFree tier — key may be requiredFree tier — API key required
Rate limitUnpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Coinlayer vs OpenSea: common questions

Which is more reliable, Coinlayer or OpenSea?

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

Both ask you to authenticate — Coinlayer uses an API key and OpenSea uses an API key. Each key is free to obtain; the Auth and Card-required rows above spell out the signup terms.

Can I call Coinlayer and OpenSea from the browser?

Yes — both Coinlayer and OpenSea 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 Coinlayer and OpenSea free for commercial use?

Coinlayer has unclear commercial terms, and OpenSea 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.