Epicenter

The episode delivers genuine insider mechanics - the flywheel explaining builder concentration, the private order flow refund game, and the TEE experiment with Flashbots - but is diluted by extended basic explanations and several stretches where the guest gives vague non-answers that go unprobed.

“if you send that transaction to a single builder now, the builder can sort of try to keep as much of that as possible and then refund a bunch of that back to the user so that the effective price that the user is paying is actually lower than the initial sort of one eth in that example”

“we basically streamed our state into a TE that was locked down. And um, the TE was configured such that the only data that was leaving the TE was at the bundle that is sent back only to our endpoints”

The explanation of why builder concentration emerged organically from trading-firm self-interest in private order flow is the clearest articulation of that dynamic available publicly, but most of the MEV-aware audience will recognise the framework; no genuinely contrarian or first-principles arguments are made.

“if you send those transactions to everyone, then all those priority fees will be bid away. And so if they just kept it to their own builder, um, they could optimize on those fees”

“ideally we don't want to get into the solving business because solving itself like being up to date with all the liquidity pools, potentially having internal liquidity and offering that via uh, like some or versus passive AMMs that starts to then become more of a trading firm”

Kubi Menzer is the operating CEO of the currently largest Ethereum block builder by market share - a genuine practitioner who built the business from a prop-trading background and made irreversible resource commitments to the space, not a circuit-speaker or commentator.

“we basically burned our boats, we stopped all trading activities and we went full on into block building”

“currently we are the currently largest, the uh, second largest builder net by Flashbots”

Market-share estimates (Titan ~50%, Flashbots 20-30%, Quasar 15-20%), named competitors, and the concrete TEE experiment with Flashbots add real texture, but revenue figures, transaction volumes, and latency benchmarks are entirely absent, and several key questions receive openly vague answers.

“flashbots has like 20 to 30 and we have like something around 50 usually”

“I don't have a specific stat in mind but it's definitely skewed to especially if you look at like the really really uh, big um blocks”

The host demonstrates genuine technical preparation - quoting mempool statistics and correctly distinguishing transaction categories - but routinely over-explains in his own questions, answers them partially himself, and lets vague responses pass without follow-up.

“last time I checked, um, only about half of uh, the transactions that later get included are actually go through the public mempool and everything else is public order flow and that's by number of transactions, by kind of transaction value it's more than half”

“I don't have a specific stat in mind but it's definitely skewed”