Ethereum Block Builder Eureka Labs Raises $6.7 Million, Unveils Programmable Blocks
Eureka Labs said its $6.7 million seed round was co-led by Spark Capital and Collider Ventures and used a SAFE plus token warrant structure, while the startup says it has become Ethereum’s fourth-largest block builder.
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Fact Check
The statement is fully corroborated by primary reporting from The Block and secondary reports from WEEX and Odaily. All key details—the $6.7 million amount, the lead investors (Spark Capital and Collider Ventures), the 'programmable blocks' concept, the SAFE + token warrant structure, and the ranking as the fourth-largest builder—are present in the evidence.
Summary
Eureka Labs, an Ethereum block builder, completed a $6.7 million seed round co-led by Spark Capital and Collider Ventures using a SAFE plus token warrant structure. The company said the funding will support development of its programmable block technology. The new update adds that Eureka Labs was founded in December 2024 and is now Ethereum’s fourth-largest block builder. Earlier reporting stated the round included $4.7 million raised in April 2025 and another $2 million in June.
Terms & Concepts
- Ethereum: A blockchain network that supports smart contracts and decentralized applications.
- Block builder: A blockchain infrastructure participant that assembles transaction blocks for inclusion in a network’s block production process.
- SAFE: A Simple Agreement for Future Equity, a startup financing instrument that gives investors rights tied to a future equity event.