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Mempool vs VALR

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

APIMempoolHEALTHY89VALRHEALTHY89
Uptime · 30d
Uptime · 90d86.3%100%
Uptime · 30d90.0%100%
P50 · ms100696
P95 · ms22583273
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 86.3% versus VALR 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, Mempool or VALR?

Mempool has the lower median latency in our checks — Mempool responds in 100 ms versus VALR at 696 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 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.