Maximal Extractable Value (MEV) arbitrage is putting Ethereum in a centralized chokehold, as a handful of block builders dominate transaction ordering, according to a new report co-produced by several leading institutions.
The report, entitled “Measuring CEX-DEX Extracted Value and Searcher Profitability: The Darkest of the MEV Dark Forest,” reveals that a few powerful firms control the MEV market, leveraging vertical integration with their own CEX–DEX arbitrage searchers to outmuscle smaller players. As a consequence, Ethereum’s decentralization bonafides are at risk – with the spectre of censorship and unfair pricing looming large. The comprehensive report highlights that MEV arbitrage – profiting by reordering transactions to exploit CEX-DEX price gaps – is a big business, with MEV bots/searchers reportedly extracting $1.5 billion via a combination of sandwich attacks, front-running, and liquidation snipes last year.
The lucre is flowing into the hands of a select few: the report specifically shone a spotlight on three builders, Titan, Beverbuild, and rsync, noting that they had pocketed the lion’s share of MEV extracted in recent years. The trio’s power lets them prioritize high-profit transactions, hiking fees for regular users. Vertical integration, whereupon builders run their own searchers to cherry-pick transactions, only compounds the issue by sidelining retail validators and inflating costs. With the bulk of MEV profits coming from arbitrage, the dynamic threatens the network’s open ethos and gives rise to the prospect of Ethereum becoming a walled garden.
Introduced with the network’s transition to Proof-of-Stake, Ethereum’s Proposer-Builder Separation (PBS) – which bifurcates the validator’s duties into proposer and builder – was intended to ensure fair transaction ordering from block proposals. Paradoxically, it has jeopardized decentralization and fairness, enabling deep-pocketed builders to outbid competitors for block space and lock out smaller players. Indeed, 80% of Ethereum blocks are currently proposed by just two entities. Needless to say, centralization of power is something big chains strive to avoid – and the waning influence of smaller validators is a canary in the coalmine for a network purporting to be open to all. Without reform, PBS could cement a hierarchy that betrays the platform’s core principles.
Some blockchains are tackling MEV head-on. One example is Neo, an open-source platform whose EVM-based sidechain Neo X was created to curb MEV manipulation. “Neo X uses an enveloped transaction approach which keeps transaction details hidden until after ordering,” explains Steven Liu, Head of Development at Neo. “Since validators can’t see the content or potential profit from reordering, they have no incentive or ability to manipulate the sequence – removing MEV opportunities from the start.” Neo X’s threshold decryption adds another layer of protection. “Through Distributed Key Generation (DKG), each consensus node holds only part of a private key, while all share one public key,” says Liu. “Users encrypt transactions with this public key, keeping them private until ordering is finalized. Only when enough nodes – over two-thirds – combine their partial decryptions can the full transaction be revealed, preventing single nodes or small groups from colluding or censoring.”
How Ethereum’s developers react to the “critical economic and strategic considerations” highlighted by the report remains to be seen. Will the network break free from MEV’s centralized grip – or continue to let a few builders call the shots? One thing’s for sure, bold solutions are needed to ensure the platform works for the many, not the few. In the meantime, alternatives willing to tackle the arbitrage problem head-on are waiting with open arms.
