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Fee Payment Asset

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

The FPA has several important properties:

  • It is fungible
  • It cannot be transferred between accounts on the Aztec network
  • It is obtained on Aztec via a bridge from Ethereum
  • It only has public balances

All transactions on the Aztec network have a non-zero transaction_fee, denominated in FPA, which must be paid for the transaction to be included in the block.

When a block is successfully published on L1, the sequencer is paid on L1 the sum of all transaction fees in the block, denominated in FPA.


We need a definition of the L1 fee payment asset.