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.
Block content rules
Enforce inclusion or exclusion lists for specific transactions or protocols.
Smarter scheduling
Integrated MEV-aware scheduler selects the highest-value, policy-compliant blocks.
ACE support
Optional Application Controlled Execution (ACE) integration for app-level ordering.