BTC: Mempool Inflow

Bitcoin Mempool Inflow: daily data through 9 Nov 2026.

The rate at which transactions arrive in our Bitcoin node's mempool, in virtual bytes per second: every new transaction, and the inflow net of transactions that replaced or displaced others already waiting.

Why use it. Net inflow against the roughly 1,665 vB/s that blocks can carry on average shows whether demand for block space is building up or draining away. The gap between the two lines is transactions being replaced: fee bumps, cancellations and replacement floods. How to read it. Above about 1,665 vB/s net more is arriving than blocks take, so the backlog and fees tend to rise; below it the mempool drains. A reading well above that line for hours is a congestion event.

Calculation. All new transactions: the policy virtual size of every transaction appearing for the first time in our once-a-minute mempool capture, divided by the seconds those captures cover. Net inflow: the growth of the node's mempool between its size samples plus the virtual size of the blocks found between them, divided by the time between the samples. An interval longer than five minutes between two captures or samples is left out, and a period shows only if at least a fifth of it is covered. From the snapshots our mempool collector takes of our own Bitcoin node's mempool, about once a minute, from 3 October 2026; no earlier values are reconstructed. One node's view: other nodes hold slightly different transactions, and a transaction that arrives and is mined between two snapshots is not observed.