Fees, Ordering, and Lifecycle - Base Documentation

Fees

Transactions use the normal fee rules for their type. For EIP-1559 transactions, set maxFeePerGas and maxPriorityFeePerGas on the signed transaction. A transaction that is not included does not pay onchain execution fees. An included transaction pays normal execution fees, even if it reverts.

Ordering

A transaction competes for inclusion only after every predicate matches. A matching predicate does not reserve block space.

Expiry

Add a block_number predicate with a maximum block to limit a transaction’s lifetime. Combine it with flashblock_index to tighten the expiry bound to a position within that block’s Flashblocks.

Replacement

A later transaction with the same sender and nonce can replace a pending transaction. If the RPC returns an underpriced-replacement error, increase the fee fields, sign again, and retry.