Ethereum block builder Eureka Labs completes $6.7 million financing, led by Spark Capital and Collider Ventures

Ethereum block builder Eureka Labs announced the completion of a $6.7 million seed round financing, led by Spark Capital and Collider Ventures.

It is reported that the company has introduced the concept of "programmable blocks," which incorporates executable logic during the block building phase, allowing blocks to not only package transactions but also achieve more complex functions, such as temporary fund calls, advanced computations, and more refined transaction sorting. Eureka Labs was established in December 2024 and has now become the fourth largest block builder on Ethereum, but its market share is about 1.5%, showing a significant gap compared to leading builders. This round of financing was completed in two phases, raising $4.7 million in April 2025 and an additional $2 million in June. The company stated that this financing will be used to expand its block building technical capabilities and promote the application of "programmable blocks" in the Ethereum ecosystem.