Eureka Labs Nets $6.7M to Build 'Programmable Blocks' on Ethereum

• Eureka Labs has secured $6.7 million in seed funding to develop its "programmable blocks" technology.
• The startup has quickly risen to become the fourth-largest Ethereum block builder, despite currently holding a 1.5% market share.
• New features include intra-block credit and state-aware pre-computation, designed to enhance efficiency and reduce gas costs.

Funding and Stealth Exit

Eureka Labs recently emerged from stealth mode, announcing a $6.7 million seed round. This capital was raised in two separate tranches: $4.7 million in April 2025 and an additional $2 million in June 2025. The investment round was co-led by Spark Capital and Collider Ventures, with participation from a broad group including Varrock Ventures, Node Capital, and Scott Keto, the president of CoinList.

The funding was structured as a simple agreement for future equity (SAFE) combined with token warrants. As part of this growth phase, Avishay Ovadia from Collider Ventures has joined the company's board of directors.

Introducing Programmable Blocks

The core innovation of Eureka Labs is the transition from passive transaction containers to active execution environments, which they call programmable blocks. CEO Nir Magenheim explains that this allows logic to be embedded directly into the block construction process. This shift enables several advanced functionalities:

• Intra-block credit: Access to temporary, collateral-free loans that must be settled before the block is finalized.
• State-aware pre-computation: Performing complex calculations during construction to lower gas costs and improve reliability.
• Real-time data access: Incorporating off-chain information into transactions as blocks are being built.
• Deterministic placement: Ensuring specific transactions are executed in a precise, guaranteed order.

Market Position and Infrastructure

Founded in December 2024, the Tel Aviv-based startup has scaled rapidly. In the competitive landscape of Ethereum's Proposer-Builder Separation (PBS) architecture, Eureka Labs is already the fourth-most active builder by block count. However, the market remains highly concentrated, with the top three entities—Titan Builder, BuilderNet, and Quasar Builder—controlling approximately 96% of the total volume.

Currently, the company employs 12 people across its headquarters in Israel and a new research facility in Poland. Their business model relies on generating revenue through fees from transactions included in their specialized blocks, aiming to transform block builders into a critical execution layer for the Ethereum network.