Open-source Bitcoin explorer and real-time mempool visualizer
Last updated: July 2026
Mempool.space is the most popular open-source Bitcoin block explorer and mempool visualizer, and it has become the default tool for understanding Bitcoin fee markets. Its signature feature is a live, visual representation of the mempool — the pool of unconfirmed transactions — showing projected blocks, fee-rate distributions, and real-time fee recommendations, which is invaluable for anyone trying to time a Bitcoin transaction to avoid overpaying. Beyond fees, it offers full transaction and address lookup, block details, Lightning Network exploration, mining pool statistics, halving countdowns, and rich network analytics. Because it's open-source, mempool.space can be self-hosted, and many Bitcoin businesses and node operators run their own instance for privacy and reliability — a meaningful advantage over closed explorers. The hosted version at mempool.space is free to use, with an enterprise offering for businesses that want dedicated support or custom deployments. The considerations are Bitcoin-specific: it's Bitcoin (and Lightning) only, so it's irrelevant for EVM or other ecosystems, and its depth around fees and mining can be more than a casual user needs. But for Bitcoin users, developers, and node operators — anyone who cares about fee estimation, mempool state, or wants a self-hostable, privacy-respecting explorer — mempool.space is the gold standard and one of the most respected open-source tools in all of crypto.
Mempool.space offers a free plan.
Mempool.space
Free
| Feature | Mempool.space |
|---|---|
| Transaction History | ✓ |
| Contract Verification | ✗ |
| Token Tracking | ✗ |
| Nft Tracking | ✗ |
| Api Access | ✓ |
| Multi Chain Support | ✗ |
| Gas Tracker | ✓ |
| Source Code Viewer | ✗ |
| Address Labels | ✗ |
| Private Notes | ✗ |
Yes, Mempool.space has a free plan.
Mempool.space is used for open-source bitcoin explorer and real-time mempool visualizer. It's primarily used by Web3 teams in the Block Explorers category.
See our full alternatives comparison at https://chainpick.io/alternatives/mempool-space.
Mempool.space has a rating of 4.7/5 based on 342 reviews. Key strength: Best-in-class Bitcoin fee estimation and mempool visualization. Main limitation: Bitcoin/Lightning only.
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