Solving L2 economic challenges and Ethereum’s biggest complexity: MEV

At Radius, we spend a lot of time thinking about Ethereum’s biggest challenges -- and how to make the ecosystem better for users and chains alike. In the past, we’ve focused on keeping transaction ordering fair, because practices like frontrunning and sandwich attacks create hidden costs that erode trust and push users away.

Our efforts have made L2s safer and more reliable. Now, we’re moving forward to help L2s capture MEV in a way that’s both fair and sustainable, unlocking a new growth path for the ecosystem.

One of the biggest problems for L2s today is revenue. Most rely on transaction fees, but those swing wildly with market activity and network usage. That leaves L2s on unstable financial footing.

The impact? L2s can’t depend on fees as a consistent income stream and users lose trust due to costly or unfair experiences.

To strengthen Ethereum, we need better solutions: ones that offer reliable revenue for L2s and a safer, more predictable experience for users.

Secure Block Building (SBB) is our product that helps L2s capture MEV revenue fairly without harming users. By connecting L2s with searchers, SBB enables profits from backrunning, where trades are executed after user transactions. This gives L2s a stable source of MEV-based revenue, without compromising fairness or trust.

1. Searchers identify opportunities like price discrepancies or liquidations for new blocks in an L2.

2. They submit these transactions to the L2 sequencer, which includes them after user transactions. This is backrunning.

3. Meanwhile, user transactions remain encrypted until included, preventing manipulation (like frontrunning or sandwiching).

This keeps users protected while unlocking MEV profit that flows back to the rollup.

👉 Learn about the different types of MEV in our documentation.

SBB is just the beginning. It’s the foundation for our broader vision: cross-rollup arbitrage that helps L2s earn revenue across the entire Ethereum ecosystem.

To make that possible, L2s need to execute searcher transactions correctly and securely. SBB provides the infrastructure to make that happen, and sets the stage for our next step: Lighthouse.

Lighthouse is a decentralized network for cross-rollup MEV. It acts as a coordination hub that connects searchers to arbitrage opportunities across:

• Layer 2s

• Ethereum L1

• Centralized exchanges

This network unlocks MEV at a global scale, maximizing revenue for L2s and enabling economic interoperability across Ethereum.

• Contact us to learn how SBB can support your L2

• Read our Documentation

• Check out Symbiotic’s Network Highlight: Radius Secure Block Building (SBB)