Cardano has no open gas-bidding fee market like account-based chains, so classic priority-gas auctions are absent. Some MEV still exists: the protocol does not enforce any transaction order within a block, and the stock node fills blocks in mempool arrival order, so back-running (adding your own transaction after one you see in the mempool) needs no modification to the node, and full reordering would require a modified block producer. What keeps MEV limited is that a transaction's inputs and outputs are fixed when it is built: a reordered transaction cannot be made to execute at a worse price, it either goes through as written or fails.
Sources
Explore next
- UTXOUnspent Transaction Output, the accounting model Cardano shares with Bitcoin where transactions consume whole earlier outputs and create new ones, similar to spending banknotes and getting change back.View term
- eUTXOCardano's extension of the UTXO accounting model; each output can carry datum and script logic, so smart contracts express rules without the shared mutable state used by account-based chains.View term
- Transaction FeeThe lovelace charged to submit a transaction, calculated from the transaction's serialized size in bytes using two public protocol parameters.View term