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Mempool vs VALR

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

APIMempoolNEW—VALRNEW—
Uptime · 30d
Uptime · 90d—%—%
Uptime · 30d—%—%
P50 · ms——
P95 · ms——
AuthnoneapiKey
CORSyesno
HTTPSyesyes
Card requirednono
Commercial useunclearunclear
Data licenseUnverified (open-source project)Unverified
Free tierFree public API; no key for basic usageFree tier — key may be required
Rate limitEnforced — HTTP 429 on excess, repeated abuse may be banned; numeric limits unpublishedUnpublished
In directory since2026-07-052026-07-05
operationalpartialdownno data

Mempool vs VALR: common questions

Which is more reliable, Mempool or VALR?

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

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

Can I call Mempool and VALR from the browser?

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

Are Mempool and VALR free for commercial use?

Mempool has unclear commercial terms, and VALR 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.