MEV Bots Are Eating Up Blockchain Scaling Gains, Report Warns
Blockchains keep getting faster, but there’s a catch—much of that extra space isn’t going to regular users. According to a new report from Flashbots, bots chasing Maximum Extractable Value (MEV) are hogging most of the new capacity on chains like Solana and Ethereum Layer 2s. The result? Scaling efforts aren’t delivering the lower fees or smoother experiences they should.
The report digs into how MEV, the practice of reordering transactions for profit, has shifted from a niche concern to a full-blown bottleneck. Researchers found that high-frequency trading bots flood networks with speculative transactions, hoping to snipe arbitrage opportunities. Most fail, but the sheer volume clogs things up anyway.
The Hidden Cost of MEV Spam
Bert Miller, one of the researchers, shared some eye-opening numbers. On Solana, bots use around 40% of the blockspace but contribute just 7% of the fees. Over on Ethereum L2s like Base and Optimism, it’s even worse—more than half the available gas gets eaten by spam transactions.
Here’s the kicker: Base recently scaled up its throughput by 11 million gas per second, a huge jump. But almost all of it got swallowed by bots. Miller pointed out that one successful arbitrage might require *132 million gas* in failed attempts just to land. That’s like burning four Ethereum blocks for every win.
The problem isn’t just waste—it’s how these bots work. Private mempools, meant to protect users from frontrunning, leave MEV searchers in the dark. So they spam the chain with probes, hoping something sticks. The result? A ton of useless computation that regular users end up paying for.
Is There a Fix?
Flashbots thinks so. Their proposal leans on two ideas: “programmable privacy” (letting bots see enough to avoid spam without exploiting users) and clearer rules for transaction priority. Instead of brute-force spamming, bots would bid openly for space.
Some experiments are already underway. Miller mentioned tests using Trusted Execution Environments (TEEs), where bots run inside secure enclaves to prevent shady tactics like sandwich attacks. Others, like Chainlink’s Smart Value Recapture, aim to redirect MEV profits back into DeFi apps. Even former Binance CEO Changpeng Zhao has floated dark pools with zero-knowledge proofs as a possible solution.
None of these are perfect yet. But if they pan out, MEV could go from a drain on the system to something that actually benefits chains—and maybe even cuts fees for the rest of us. For now, though, scaling blockchains might mean racing against bots just to keep up.
