Package Relay
mempool · policy
The ability for nodes to relay groups of related transactions together so miners evaluate fees on the package total.
Package relay lets nodes share and evaluate groups of related unconfirmed transactions together. This matters when one transaction has a low fee but a dependent child transaction pays enough to make the combined package attractive to miners.
Package relay improves CPFP fee-bumping and reduces some mempool-pinning problems, but it is relay policy rather than a consensus rule. Support can vary by node software, version, and network conditions, so wallets still need fallback strategies.
Related terms
CPFP
→A fee-bumping technique where a high-fee child spends an unconfirmed output so miners can evaluate parent and child fees together.
mempool · fee · transaction
Mempool
→A node's local set of unconfirmed transactions accepted for possible relay and block inclusion.
blockchain · node
Fee Rate
→Transaction fee per unit of size: commonly sat/vB for Bitcoin or sat/byte for Bitcoin Cash. It helps explain miner selection, not a guaranteed wait.
blockchain · economics
Replace By Fee (RBF)
→A mempool policy that can accept a conflicting unconfirmed transaction when the replacement satisfies fee and relay rules.
bitcoin · policy · fees