# What is full-RBF?

A replace-by-fee policy under which any unconfirmed transaction can be replaced, signalled or not.

URL: https://blockspace.wiki/answers/what-is-full-rbf/

[Full-RBF](https://blockspace.wiki/glossary/full-rbf/) is a form of [replace-by-fee](https://blockspace.wiki/glossary/replace-by-fee/): a node accepts a higher-fee replacement for any unconfirmed transaction, whether or not it signalled BIP 125 replaceability. Bitcoin Core 28.0 made it the default, changing `-mempoolfullrbf` from 0 to 1. [Blockspace Co.'s own node](https://blockspace.wiki/glossary/blockspace-holdings-node-and-indexers/) runs with it on.

Sources:

- Bitcoin Optech: replace-by-fee (RBF) · https://bitcoinops.org/en/topics/replace-by-fee/
- Bitcoin Core 28.0 release notes · https://bitcoincore.org/en/releases/28.0/
- Blockspace Co. records

Live figures: relay as of block 972,511, 2026-10-21 17:17:11 UTC

Updated: 2026-10-21