ERC-8421 explores how Frame Transactions can use alternative mempools with more permissive validation rules and a reputation system.
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Etherspot explains: ERC-8421 Frame Transaction Alternative Mempools
EIP-8141 Frame Transactions need mempool rules that protect the network from spam while supporting different types of accounts and applications.
ERC-8421 proposes a more permissive, reputation-based alternative

