On-Chain Sequencer Fees

Definition ∞ On-Chain Sequencer Fees are charges applied for the service of ordering and submitting transactions to the main blockchain by a designated entity known as a sequencer. These fees are specific to certain layer-2 scaling solutions, such as optimistic rollups. They compensate the sequencer for its operational costs and the service it provides in bundling and committing transactions. These fees are a key part of layer-2 economics.
Context ∞ On-chain sequencer fees are a critical element in the cost structure and user experience of layer-2 solutions, directly impacting the economic viability of decentralized applications built on them. News reports often discuss efforts to optimize these fees, balance sequencer profitability with user affordability, and explore decentralized sequencer models. Their management is central to the scalability and adoption of these networks.