# 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.

URL: https://blockspace.wiki/research/sub-1-sat-vb-share/

**Status on [blockspacelabs.com](https://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](https://blockspace.wiki/glossary/fee-floor/) is 0 sat/vB (as of block 972,320, 2026-10-20 12:17:53 UTC), so its [mempool](https://blockspace.wiki/glossary/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.

## Related research

The Live project [sub-1 sat/vB relay](/research/sub-1-sat-vb-relay/) shows the current mempool. [Low-fee propagation](/research/low-fee-propagation/) asks which of these transactions are mined.

Sources:

- The blockspacelabs.com page (index.html) · https://blockspacelabs.com
- Blockspace Labs facts (data/facts.json) · https://blockspacelabs.com
- Blockspace Holdings records

Live figures: relay as of block 972,320, 2026-10-20 12:17:53 UTC

Updated: 2026-10-20