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About Eureka Builder
Eureka Builder is an Ethereum block builder focused on providing advanced infrastructure for MEV-related strategies. Its core business includes deterministic transaction ordering (making transaction positions predictable), intra-block liquidity management, bundle lifecycle tracing, and builder-side compute primitives that enable searchers and protocols to execute complex strategies directly during block construction.
Its core competitiveness lies in making the originally black-box block construction process transparent and programmable, addressing pain points in the MEV ecosystem such as opaque transaction ordering, high uncertainty in bundle execution, and difficulty coordinating cross-strategy operations. Through open APIs and tiered permission controls, it allows developers to more precisely control transaction landing positions, reducing front-running and sandwich attack risks.
In the past six months, the project experienced a negative incident: in June 2026, its MEV Bot mistakenly transferred 167 ETH (approximately $300,000) to a random wallet due to a fee collection logic error, and the recipient refused to return the funds. This incident exposed vulnerabilities in its fund safety verification mechanisms. Although developers attempted to recover the funds through on-chain messages, they were unsuccessful. Apart from this, no major public updates on technical progress were observed.
In the past six months (2026-03-01 to 2026-09-01), Eureka Builder, a neutral Ethereum block builder, made key progress. In June 2026, it completed a $6.7M seed round led by Spark Capital, among others, to expand its programmable block technology. The team of 12 is based in Tel Aviv and Poland. Core products include "programmable blocks" featuring Intra-Block Loans, Builder Execution Extension (BEX), and Deterministic Block Placement, enabling builders to run complex computations, query real-time external data, and optimize transaction ordering within a block. The official roadmap focuses on: 1) Deepening PBS ecosystem collaboration while maintaining neutrality; 2) Launching developer toolkits to lower the barrier for programmable blocks; 3) Exploring cross-chain programmability to extend execution environments to multi-chain scenarios. Future priorities emphasize shifting from "block packaging" to "block execution environments," driving innovation in Ethereum's execution layer.
Nir Magenheim, Co-Founder & CEO. Previously SDE at Amazon (2020-2024), DeFi expert at Alterya (2022-2023), Fund Manager & Head of DeFi at Atitlan Asset Management (2021-2023), Co-Founder & CEO of PolyWizz (2017-2019, acquired), Real-Time Embedded Software Engineer at Cisco (2011-2013). B.Sc. in Computer Science from The Open University of Israel.
Eli Shalom, Co-Founder & CTO. Previously VP Algorithms & Data Science at Apiiro (2021-2023), Principal Algorithms Manager at Apiiro (2020-2021), Director of Technology at Twiggle (2018-2020), Algorithm Engineer at Twiggle (2016-2018), Software Developer at Twiggle (2014-2016). B.Sc. in Computer Science from Technion - Israel Institute of Technology, M.Sc. in Computer Science from The Open University of Israel.