Flowra launches Open Orderflow Auction for Solana validators

Flowra has launched its Open Orderflow Auction for Solana, introducing an open block-building system that allows registered searchers to compete for transaction inclusion while giving validators greater control over blockspace and MEV revenue.

Flowra's Open Orderflow Auction lets registered searchers compete transparently for transaction inclusion on Solana blocks.

Flowra's single-validator test raised compute units per block by 20.6%, with comparable block fees higher.

Programmable Block Policy lets validators set inclusion rules and support compliance screening without protocol changes.

Flowra has launched its Open Orderflow Auction for the Solana ecosystem, introducing a competitive block-building framework aimed at opening the network's MEV market to broader participation.

The framework is designed to open block building to competitive bidding, improve price discovery in Solana's MEV market, and help validators capture more revenue. Registered searchers can compete for transaction inclusion through a transparent auction instead of relying on closed orderflow channels. Flowra said the Open Orderflow Auction is now available to validators and searchers, while it continues onboarding institutional-grade validators ahead of a broader rollout.

Flowra said the auction changes how transaction inclusion can be offered to searchers. Rather than routing orderflow through closed channels, registered participants can bid openly for access to blockspace. The company expects that model to create clearer competition around transaction inclusion and allow validators to receive more of the value generated by MEV.

Solana validators process transactions and participate in network consensus. Flowra's framework focuses on that validator layer by introducing a new method for constructing blocks and allocating blockspace. The company says its aim is to improve transaction transparency, value distribution, and incentive alignment among validators, users, and builders.

Flowra reported early results from testing its setup on a single validator. According to the company, the Flowra-enabled validator increased compute units per block by 20.6%. The validator moved from 84% to 101% of the network average during the test. Flowra also reported higher block fees than comparable validator software.

The company said the same setup achieved 100% block production and 99.999% block engine uptime. Those figures come from Flowra's early testing and relate to one validator. The company is using the results as it expands onboarding for its Open Orderflow Auction across institutional-grade validators in the Solana ecosystem.

Alongside the auction, Flowra introduced Programmable Block Policy. The feature allows validators to define transaction inclusion policies at the block-building layer. Flowra said this can give validators more operational flexibility, including the ability to address regulatory or institutional compliance requirements without changing the underlying Solana protocol.

Flowra recently announced a collaboration with compliance infrastructure provider Honeypot. The companies plan to bring sanctions and risk screening to the block-building layer. Flowra presented the policy system as a way for validators to control how blocks are constructed while retaining verifiability and auditability.

Flowra said its architecture takes inspiration from the competitive block-building model that emerged on Ethereum. Ethereum.org describes proposer-builder separation as a structure in which block builders submit bids and validators can select the most profitable offer. Flowra believes Solana's high-throughput, low-latency design can support a similar market-based approach.

"Solana's performance has made it one of the industry's leading blockchain networks, but its MEV market remains largely concentrated," Flowra CEO Harry Hwang said. "By opening block building to transparent competition, we're creating a more efficient market for blockspace while giving validators greater control over how their blocks are constructed with full verifiability and auditability."

Flowra develops validator and order flow infrastructure for Solana. Its products include validator infrastructure, delegation programs, and MEV-related technologies. The company's broader goal is to support a more open, efficient, and scalable foundation for blockchain networks while improving how value is distributed among network participants. The auction is available to validators and searchers participating across the Solana ecosystem as the network expands further.

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