Harmonic: Open block building infrastructure for Solana
Solana wins with performance and open, fair markets.
what is harmonic
Open block building + builder market
Harmonic is an open block building system optimized for validator revenue and throughput, built to make Solana faster, fairer, and more competitive.
Fast and fair markets beat fast‑but‑closed systems over the long run.
Pro-validator
Optimizes for revenue while remaining open, fast, and fair
Pro-network
Solana's performance ceiling rises with open and competitive markets
Pro-retail
Fair inclusion, no artificial latency, and lower sandwich exposure
How It Works
Key Features
Drop-in client
Run Harmonic with your current stack. There is no vendor lock-in.
Open builder market
Harmonic aggregates blocks from multiple independent builders.
Open, accessible data
Harmonic will publish a suite of tools to make Solana data more accessible to everyone, especially apps and users.
Smarter scheduling
Competing builders, using custom schedulers, pass blocks to the block engine, which intelligently selects those that maximize validator income.
ACE support
Optional Application Controlled Execution (ACE) integration for app-level ordering.