Kraken vs Mempool
Same instrument, two spec sheets — measured, not claimed.
Kraken vs Mempool: common questions
Which is more reliable, Kraken or Mempool?
On our scheduled checks, Kraken leads on measured uptime — Kraken at 100% versus Mempool at 86.3% 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, Kraken or Mempool?
Mempool has the lower median latency in our checks — Kraken responds in 155 ms versus Mempool at 100 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 Kraken and Mempool need an API key?
Neither needs a paid key — Kraken is callable with no signup, and Mempool is callable with no signup. Both are quick to prototype with; rate limits still apply.
Can I call Kraken and Mempool from the browser?
Yes — both Kraken 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 Kraken and Mempool free for commercial use?
Kraken 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.