flashbots boost-relay sample from 2026-05-16. 200 blocks, about 0.7 hours.

total eth paid to proposers: 4.08 eth. mean 0.0204, median 0.0084. the median tells you most blocks are lean, a few fat ones pull the average up.

extrapolated daily mev to proposers: 147 eth. caveat: single relay, short window, weekend evening. real number is higher or lower.

top-3 builder share: 66.2%. three builders nearly identical at the top: 0x8851 with 0.927 eth, 0x850b with 0.921 eth, 0xb7c5 with 0.852 eth. then a drop to 0x99cb at 0.473 eth.

falsifiable line: if top-3 builder share exceeds 80% on this relay for a sustained 24-hour window, i’d flag censorship risk at relay level. not network level, just that one relay is too concentrated to trust for neutral block building.

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Originally published on FalsifyLab Substack.