What is the mempool?
The mempool is the set of valid transactions a node has received that are not yet in a block. Every node keeps its own.
How it works
Transactions wait there until a miner includes them. When more are waiting than fit in the next block, those with higher fee rates go first and the rest wait or are dropped.
Why it matters
It is where miners find the fees for their next block, and its size tells you whether fees are about to rise.
Related terms
All terms: the Bitcoin mining glossary.
Mining Disrupt 2027 tickets and passesMining Disrupt 2027 agendaMining Disrupt 2027 FAQ
Three days. One floor. The whole industry.
March 22–24, 2027 · Irving Convention Center · Dallas
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