Harmonic, a New York–based infrastructure startup building on Solana, has raised $6 million in a seed round led by venture firm Paradigm, with participation from undisclosed angel investors connected to the Solana ecosystem. The funding aims to accelerate Harmonic’s vision of making Solana’s blockchain operate at near–Nasdaq speeds.
A New Model for Solana Block Building
Harmonic is introducing Solana’s first open block-building system, designed to allow validators to source blocks from multiple competing builders in real time. This innovation replaces Solana’s current system, where each validator takes turns constructing blocks during a set time slot—a process that, while effective, centralizes control and limits flexibility.
By introducing a coordinated aggregation layer, Harmonic enables validators to receive proposals from different builders and select the best-performing blocks based on their own preferences. This mechanism mirrors high-frequency trading routers used in traditional finance, where the fastest and most efficient orders win.
Co-founder Jakob Povšič, who also co-founded the crypto R&D firm Temporal, explained that Harmonic effectively “auctions blocks from a variety of block builders on the network, including Jito, Temporal, Jito BAM, and Paladin.” Validators can then choose blocks that align with their goals—whether minimizing toxic MEV (maximal extractable value) or maximizing revenue potential.
“Bringing Nasdaq Speed to Solana”
Povšič likened Harmonic’s approach to the architecture of a modern stock exchange.
“Harmonic brings Solana closer to being the onchain Nasdaq,” he said. “For Solana to hit one million transactions per second, it needs both competition and coordination—exactly what Harmonic provides.”
The startup’s technology complements upcoming Solana network upgrades, including higher compute limits and application-controlled execution (ACE), which lets smart contracts dictate trade sequencing and settlement. Together, these tools could give Solana an edge over centralized exchanges and derivatives platforms by offering faster and more transparent trading directly on-chain.
Backing from Paradigm
Paradigm, one of the most prominent investors in crypto infrastructure, believes Harmonic could redefine how blocks are built and validated on Solana.
“Harmonic’s open aggregation model transforms Solana’s block production into a continuously optimized and competitive marketplace,” said Frankie, Paradigm’s investing and research partner. “The result is exchange-grade performance capable of approaching Nasdaq speed in both reliability and throughput.”
While Harmonic has not disclosed details about its valuation or specific investor roles, Povšič confirmed the company operates with a core team of around 10 members in New York City. The team plans to continue refining its infrastructure as adoption grows within the Solana ecosystem.
A Step Toward On-Chain Market Efficiency
By decentralizing and optimizing how blocks are created, Harmonic aims to help Solana scale its transaction capacity while maintaining fairness and transparency. As more validators and builders join this open marketplace, the network could edge closer to the speed and efficiency of traditional markets—without sacrificing its decentralized foundations.
