Blockchair vs Mempool
Same instrument, two spec sheets — measured, not claimed.
Blockchair vs Mempool: common questions
Which is more reliable, Blockchair or Mempool?
On our scheduled checks, Blockchair leads on measured uptime — Blockchair at 98.0% 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, Blockchair or Mempool?
Mempool has the lower median latency in our checks — Blockchair responds in 729 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 Blockchair and Mempool need an API key?
Neither needs a paid key — Blockchair 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 Blockchair and Mempool from the browser?
Yes — both Blockchair 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 Blockchair and Mempool free for commercial use?
Blockchair 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.