Onboard as a builder

Builders receive MEV Blocker transactions which they may add to their blocks.

Prerequisites

Be eligible to build MEV Blocker transactions
10 ETH security bond
Funds for MEV Blocker fees

Builder eligibility

To be eligible, builders must have built ≥1% of Ethereum Mainnet blocks per week during the past month.

important

We reserve the right to disconnect a builder who drops significantly below the 1% threshold while connected to MEV Blocker.

Requirements

In addition to the prerequisites, builders must adhere to the following basic requirements:

Support for core features
Builders must implement:
- Refund bundles
- replacementUuid (or uuid) for updateable bundles
- Tx hash dropping (to support dynamic bundle resolution)
Maintain ethical execution
Builders must refrain from any behavior that harms MEV Blocker users, including but not limited to:
- Frontrunning or sandwiching
- Sharing or leaking transaction/state data
- Selectively including transactions or manipulating refund outcomes
No shadow identities or fee evasion
Builders must not attempt to bypass the fee mechanism. This includes (but is not limited to) creating a separate identity (a "shadow builder") that only receives MEV Blocker flow.

We reserve the right to disconnect builders suspected of violating these rules.

Builder fees and bond

For details on billing and paying dues, see Manage builder fees.

The proceeds of the fee are used to support MEV blocker technical development and drive continuous growth in user adoption.

A refundable security deposit is required to join the network. To receive MEV blocker transactions, builders must post a 10 ETH bond to a smart contract administered by MEV Blocker implementing partners. This bond can be used to cover potential penalties or late fees. The balance will be returned to builders who decide to disconnect from MEV Blocker and are in good standing.

If wrongdoing was established, MEV Blocker reserves the right to charge the violating builder any damage caused and require a reconnection fee of 2 ETH. For example, suppose a builder included only one bundle when it was possible to include two bundles for the same transaction, hence failing to maximize the refund. They may be asked to pay from the missing bundle (plus the reconnection fee).