Ethereum block builder Eureka Labs completes $6.7 million seed round

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Ethereum block builder Eureka Labs completes $6.7 million seed funding round, led jointly by Spark Capital and Collider Ventures. The funding uses a SAFE token warrant structure and was completed in two rounds: $4.7 million in April 2025 and $2 million from Spark Capital in June 2025. The company’s valuation was not disclosed. Eureka Labs was founded in December 2024. Currently, it ranks fourth among Ethereum block builders by number of blocks built, with approximately 1.5% market share. The top three builders—Titan Builder, BuilderNet, and Quasar Builder—collectively hold nearly 96%. (The Block)

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