How can I use RBF to replace a transaction sent from Bitcoin Core?

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According to BIP 125 which is implemented in Bitcoin Core with one exception, only transactions that signal RBF will be replaceable later with higher fee rate and fee.

You can enable RBF for all wallet transactions using walletrbf=1 in bitcoin.conf file however it should be enabled by default.

In GUI there is a checkbox for RBF which can be used for each transaction:


If you are using RPC commands for creating transaction, most of them have arguments to enable RBF. Example: "replaceable" : true in fundrawtransaction

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