Builders ranked
| Builder | 8 Nov 2026 | 30-day average |
|---|---|---|
| Titan | 53.33% | 52.62% |
| Quasar | 20.60% | 19.27% |
| BuilderNet | 10.69% | 14.33% |
| Eureka | 9.06% | 7.70% |
| beaverbuild | 0.05% | 0.11% |
| bloXroute | 0.03% | 0.03% |
| Other Builders | 6.25% | 5.95% |
- Titan built 53.33% of builder blocks on 8 Nov 2026, which is 48.0% of all blocks that day (53.33% of the 90.08% that came from builders).
- Together Titan and Quasar built 73.9% of builder blocks on 8 Nov 2026.
- Builders paid proposers 206.6 ETH on 8 Nov 2026, against a median of 80.3 ETH a day over the last 30 days.
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The relays in between
A relay stands between a builder and the proposer. It shows the proposer a block's header and payment, and releases the full block only once the proposer has signed it, so neither side can cheat the other.
| Relay | 8 Nov 2026 | 30-day average |
|---|---|---|
| Ultra Sound | 39.93% | 40.13% |
| Titan | 36.62% | 37.13% |
| Aestus | 18.33% | 16.09% |
| Flashbots | 1.65% | 2.14% |
| Agnostic | 0.44% | 0.55% |
| Other Relays | 3.03% | 3.96% |
- Relays we collect confirm 87.35% of all blocks on 8 Nov 2026, against 90.08% built by builders. The 2.73-point gap is builder blocks delivered by relays we don't collect, or by none.
- A block delivered by several relays counts for each in equal parts.
The lead changed hands
TiTitanFlFlashbotsBubuilder0x69BebeaverbuildRsrsync-builder
In order of taking the lead: Flashbots (Sep 2022), builder0x69 (Nov 2022), Flashbots (Dec 2022), builder0x69 (Feb 2023), Flashbots (Mar 2023), builder0x69 (Apr 2023), beaverbuild (Jun 2023), rsync-builder (Aug 2023), Titan (Sep 2023), rsync-builder (Oct 2023), beaverbuild (Jan 2024), Titan (May 2025). Titan has led for 19 months in a row, 52.3% of builder blocks in the current month so far.
Questions
What is a block builder?
A company that assembles a full block of transactions, in the order that earns the most, and bids for the right to have it proposed. Validators are chosen to propose blocks, but most sell that slot to the highest-bidding builder and pass on the work of ordering transactions.
What is MEV-Boost?
The software most validators run to buy blocks from builders, through relays. MEV stands for maximal extractable value: the extra income available from choosing which transactions go in a block and in what order.
Why does it matter that a few builders build most blocks?
Whoever builds a block decides what goes in it and in what order. When a few companies build most blocks, those companies shape what the network's users pay and which transactions get in quickly, so their share is worth watching.
How does CryptoKeyhole know who built a block?
A block counts as builder-built when a relay we collect delivered exactly that block, or, without relay data, when its last transaction is a plain ETH payment to another address sent by the block's fee recipient. The builder is that fee recipient, named by the text it writes into its own blocks, and matched with the public delivery records of the relays. Everything else is read from our own nodes.
Does this track validators?
No. The page names organisations only (builders and relays, by the names they publish themselves) and shows aggregates. No validator, proposer or address is named.
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Figures on this page are counted by CryptoKeyhole from our own Ethereum nodes and the relays' public delivery records, and refreshed automatically.