Definition
mempool.space is an open-source block explorer and mempool visualizer maintained by The Mempool Open Source Project. It displays real-time and historical information about a Bitcoin node's mempool, visualizes pending transactions and fee rates, and lets users search and inspect transactions and blocks. While a public instance is widely used, the software is designed to be self-hosted.
Self-hosting and privacy
The privacy advantage of running your own instance is direct: when you look up your own transactions on a public explorer, that operator learns which addresses interest you. Pointing a self-hosted mempool.space at your own full node keeps those queries inside your infrastructure. The project offers one-click installation on several Raspberry-Pi node distributions, including Umbrel, RaspiBlitz, MyNode, RoninDojo, and StartOS, as well as manual and Docker deployments.
What it shows
Beyond basic explorer functions, mempool.space surfaces fee estimation and mempool congestion in a way that helps users decide what fee to attach to a transaction. For node operators it provides a clear window into the unconfirmed-transaction backlog their own node sees, which can differ from another node's view depending on relay policy. This makes it a practical companion to a self-hosted node rather than a replacement for one.
A self-hosted explorer rounds out a private node stack. See Mempool for the underlying concept and Transaction Fee for the fee dynamics it visualizes.
In Simple Terms
mempool.space is an open-source block explorer and mempool visualizer maintained by The Mempool Open Source Project. It displays real-time and historical information about a Bitcoin…