What is the Bitcoin mempool?
The mempool is where valid unconfirmed Bitcoin transactions wait before miners include them in a block. Each node has its own mempool, so views can differ slightly.
pending transactions
Bitcoin mempool viewer.
Watch Bitcoin mempool pressure, pending transaction fee bands, and candidate block data through a visual mempool lens.
Why fee pressure changes
When many users compete for block space, fee rates rise. When demand cools down, lower-fee transactions can clear. BTCNodes shows this pressure visually instead of making humans decode endless rows.
Candidate block view
The candidate block lens uses transaction selection data to approximate what could fit into the next block from this node’s perspective. It is a view, not a promise.
mempool context
How to use the Bitcoin mempool viewer
The mempool is the waiting room for valid Bitcoin transactions that have not yet been mined into a block. Each Bitcoin node has its own mempool, so totals can differ between nodes.
BTCNodes shows fee pressure, estimated queue depth, transaction fee bands, and a next-block candidate view. The candidate block shows what might fit next based on this node’s current transaction view.
Use sat/vB to compare fee rates. A higher sat/vB transaction pays more per unit of block space and is usually more attractive to miners when the queue is busy.