Gas & Fees

The Aztec network uses a fee system to incentivize sequencers to process transactions and publish blocks.

This section breaks down:

• the fee payment asset
• how users specify gas/fee parameters in their transactions
• fee abstraction
• tracking gas/fee information in the kernel circuits
• how gas/fees cover the costs of transaction execution
• published data pertaining to gas/fees

📄️ Fee Payment Asset

The Fee Payment Asset (FPA) is an enshrined asset in the Aztec network that is used to pay fees.

📄️ Specifying Gas & Fee Info

When users submit a TxExecutionRequest on the Aztec Network, they provide a TxContext, which holds GasSettings for the transaction.

📄️ Transaction Setup and Teardown

All transactions on the Aztec network have a private component, which is processed locally, and optionally have a public component, which is processed by sequencers using the Public VM (AVM).

📄️ Kernel Tracking

Gas and fees are tracked throughout the kernel circuits to ensure that users are charged correctly for their transactions.

📄️ Fee Schedule

The transaction fee is comprised of a DA component, an L2 component, and an inclusion fee. The DA and L2 components are calculated by multiplying the gas consumed in each dimension by the respective feePerGas value. The inclusion fee is a fixed cost associated with the transaction, which is used to cover the cost of verifying the encompassing rollup proof on L1.

📄️ Published Gas & Fee Data

When a block is published to L1, it includes information about the gas and fees at a block-level, and at a transaction-level.