According to TokenTerminal data, the L2 with the highest fee revenue in the past 90 days is Base, with revenue of $19.687 million; followed by OPMainnet ($4.961 million), ArbitrumOne ($3.339 million), Immutable ($1.844 million), Blast ($464,000).
According to Tokenterterminal monitoring, Ethereum L2 transaction fees have dropped sharply in the past six months, and L2's daily transaction volume and monthly active users have doubled. But the "damage" caused Ethereum L1 revenue to drop by 99%.