In an answer to my previous question, Murch used the term: incremental relay feerate.
On first, I thought that's the same as minimum relay fee (
minRelayTxFee) - minimum feerate (sat/VB) that transaction must have in order to be included in mempool and relayed. My conclusion was based on the fact that BIP125 is using that term. Cite:
The replacement transaction must also pay for its own bandwidth at or above the rate set by the node's minimum relay fee setting.
However, the Bitcoin Core documentation related to RBF uses the term incremental relay feerate for the same condition. Cite:
The additional fees (difference between absolute fee paid by the replacement transaction and the sum paid by the original transactions) pays for the replacement transaction's bandwidth at or above the rate set by the node's incremental relay feerate.
Same documentation also mentioned:
The incremental relay feerate used to calculate the required additional fees is distinct from
So, my question is what is the incremental relay feerate and how is that tied (if it is) with the minimum relay fee?