Mempool Congestion Map Screensaver
The Mempool Congestion Map screensaver visualizes Bitcoin's next projected blocks filling with real pending transactions by fee tier, drawn key-less and live from mempool.space. It's free, runs in your browser, and ESC exits.
How the Mempool Congestion Map screensaver works
The saver fetches mempool.space's real projected-block breakdown, with no key required.
Each projected block is drawn as a filling bar, its height set by real transaction count and colour by fee level.
The real fee range for each block is shown, from lowest to highest sat/vByte included.
The map refreshes on a schedule to track real mempool conditions.
A worked example
During a congested stretch you'll see many real projected blocks stacked deep with high fee ranges — genuine backlog, not a simulated rush.
Settings & tips
- Accent recolours the fill.
- This shows the real queue structure, not just a single recommended fee number.
- Fewer, emptier projected blocks mean the real network is quiet.
Frequently asked questions
- How is this different from a fee gauge?
- A simple fee gauge gives one recommended number; this shows the real full queue of projected blocks and how congested each one is.
- Is a key needed?
- No. mempool.space's public API is free and key-less.
- What are projected blocks?
- Real estimates of how mempool.space expects the next several blocks to fill, based on current real pending transactions.
- Is it free?
- Yes — free, no download, in your browser.