Ethereum block builder Eureka Labs raises $6.7 million, introduces ‘programmable blocks’

Ethereum block builder Eureka Labs has raised $6.7 million in a seed funding round co-led by Spark Capital and Collider Ventures. The funding, structured as a SAFE with token warrants, was raised in two tranches in April and June 2025. Eureka Labs, founded in December 2024, is now emerging from stealth and is the fourth-largest builder by volume, holding about 1.5% of the market share. The company is introducing "programmable blocks," which transform blocks from passive containers into active execution environments by allowing builders to add logic during construction. This enables features like intra-block credit, state-aware pre-computation using the exact block state, real-time off-chain data access, and deterministic transaction ordering. These capabilities allow developers to rely on guarantees at the block level, facilitating advanced DeFi and new onchain applications within Ethereum's Proposer-Builder Separation architecture. Eureka Labs is based in Tel Aviv with R&D in Poland and generates revenue through transaction fees.

(Source：The Block)