Eureka Labs Raises $6.7M To Bring ‘Programmable Blocks’ To Ethereum Block Building

Eureka Labs has raised $6.7 million in a seed round to introduce “programmable blocks” on Ethereum, adding logic at the block construction layer to enable new execution capabilities.

Ethereum block builder Eureka Labs has raised $6.7 million in a seed round as it emerges from stealth with a new idea for how blocks on Ethereum should work.

The startup is introducing what it calls “programmable blocks,” an approach that adds logic at the point where transactions are assembled, rather than relying entirely on smart contracts after the fact.

The round was co-led by Spark Capital and Collider Ventures, with participation from a group of crypto-focused funds and angel investors, including CoinList president Scott Keto. The funding was structured as a simple agreement for future equity with token warrants and completed across two tranches in 2025.

Eureka introduces “programmable blocks” to add logic at the point of block construction

Founded in late 2024, Eureka has quickly climbed into the top tier of block builders on Ethereum by number of blocks produced, according to Rated Network data. Its share of the market is still small, but its growth has been relatively fast in a space dominated by a handful of large players.

The company’s pitch is straightforward. Today, blocks mostly package and order transactions. Eureka wants them to do more.

With programmable blocks, builders can introduce logic during construction. That means certain things can happen before a block is finalized, not just inside smart contracts after execution begins.

In practice, that opens the door to features like temporary access to capital within a single block, running complex calculations using the exact state the block will have, enforcing strict transaction ordering and pulling in external data at execution time.

For example, a user could access short-term liquidity without collateral, as long as it is repaid within the same block. Computation that would normally be too expensive or unreliable onchain can instead be handled earlier in the process.

Block builders could evolve beyond ordering into a new execution layer on Ethereum

Eureka operates within Ethereum’s proposer-builder separation model, where specialized builders assemble blocks and validators finalize them. That structure has already created a competitive market around block production and transaction ordering.

Eureka’s view is that this layer can go further.

If blocks themselves become programmable, builders start to look less like intermediaries and more like part of the execution stack. Developers could rely on guarantees at the block level, not just within smart contracts.

That could support more complex trading strategies, better coordination between transactions and new types of applications that depend on precise timing or short-lived access to capital.

The company has not disclosed its valuation. It currently has a team of 12, split between Tel Aviv and a newer research and development site in Poland, and is hiring for technical roles.

For now, the idea is early. But it points to a shift in where logic lives on Ethereum, moving some of it one layer closer to the block itself.