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Coinlayer vs Mempool

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

APICoinlayerNEW—MempoolNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthapiKeynone
CORSyesyes
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverifiedUnverified (open-source project)
Free tierFree tier — key may be requiredFree public API; no key for basic usage
Rate limitUnpublishedEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Coinlayer vs Mempool: common questions

Which is more reliable, Coinlayer or Mempool?

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

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

Can I call Coinlayer and Mempool from the browser?

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

Coinlayer has unclear commercial terms, and Mempool 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.