Mempool
The mempool is the waiting room for unconfirmed transactions: the pool of pending transactions nodes have received but not yet put in a block. Miners or va
The mempool is the waiting room for unconfirmed transactions: the pool of pending transactions nodes have received but not yet put in a block. Miners or validators pick which to include next, typically favoring the ones paying the highest fees.
Why it matters
When you submit a transaction, it first “sits in the mempool.” Slow networks + high demand = long mempool queues and higher fees. It’s also where sandwich bots and MEV exploits happen — watching the mempool to front-run large trades — a real decentralization concern.