RBF

Replace-by-fee (RBF) is a Bitcoin policy that lets a sender broadcast a higher-fee version of an unconfirmed transaction to replace the stuck original.

When a Bitcoin transaction is stuck with too low a fee, replace-by-fee lets the sender rebroadcast a version spending the same inputs with a higher fee. Nodes signaling RBF support drop the original from the mempool and relay the replacement, so it confirms sooner. The transaction must opt in by signaling replaceability. Because unconfirmed RBF transactions can still change, recipients should wait for confirmations before treating them as final. Our Bitcoin archive RPC exposes RBF signaling and lets you rebuild and rebroadcast a fee-bumped transaction over live UTXO state.