Ethereum block builder Eureka Labs raises $6.7 million in funding, led by Spark Capital and Collider Ventures.

Ethereum block builder Eureka Labs announced the completion of a $6.7 million seed funding round, led by Spark Capital and Collider Ventures. The company introduces the concept of "programmable blocks," which incorporates executable logic during the block building phase. This allows blocks to not only package transactions but also implement more complex functions, such as temporary fund transfers, advanced computations, and finer-grained transaction ordering. Founded in December 2024, Eureka Labs is currently the fourth largest Ethereum block builder, but its market share is approximately 1.5%, significantly lagging behind the leading builders. This funding round was completed in two phases: $4.7 million was raised in April 2025, followed by an additional $2 million in June. The company stated that this funding will be used to expand its block building technology capabilities and promote the application of "programmable blocks" within the Ethereum ecosystem.