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The sub-1 sat/vB share

Research: hour by hour, how much of a mempool with no fee floor pays below 1 sat/vB, and what it would have paid at the default floor.

Status on blockspacelabs.com: Research.

What it studies #

The Labs site describes it as: "Hour by hour, how much of a mempool with no fee floor pays below 1 sat/vB, and what it would have paid at the default floor."

The Labs node's fee floor is 0 sat/vB (as of block 972,308, 2026-10-20 11:17:25 UTC), so its mempool holds transactions that pay less than Bitcoin Core's default of 1 sat/vB. The study turns single readings into a series: the share of the mempool below 1 sat/vB each hour, and the fees those transactions would have paid at 1 sat/vB.

The data it will use #

"bitcoind getrawmempool, read hourly by this site's refresh job." The site's hourly job already reads the mempool; the study keeps those readings as a series. A transaction counts as sub-1 when its base fee in sats is less than its vsize.

The figure on the card #

It is one of the Research cards that shows a current figure, because one already exists with an "as of". At 2026-10-20 09:07:08 UTC, block 972,298, the share was 98.1 % of transactions: 38,265 of 38,991. An earlier reading that day, at 08:32 UTC, found 43,585 of 44,646 (97.6 %). These are single readings, not the hourly series the study describes.

The Live project sub-1 sat/vB relay shows the current mempool. Low-fee propagation asks which of these transactions are mined.

Sources #

  1. The blockspacelabs.com page (index.html) · blockspacelabs.com
  2. Blockspace Labs facts (data/facts.json) · blockspacelabs.com
  3. Blockspace Holdings records

Live figures: relay as of block 972,308, 2026-10-20 11:17:25 UTC. Refreshed hourly.

Updated 2026-10-20 · This page as Markdown