Flowra has launched an Open Orderflow Auction (OOA), a new block-building framework for Solana designed to bring greater competition to the network's maximal extractable value (MEV) market and potentially increase validator revenue.

MEV refers to value that can be captured by reordering, inserting or censoring transactions within a block. On Solana, it is extracted largely through arbitrage and sandwich-style strategies that can affect how users' trades execute.

The Seoul-based blockchain infrastructure company said the system allows registered searchers to compete for transaction inclusion through a transparent auction rather than relying on closed orderflow channels. According to Flowra, the approach could improve price discovery while enabling validators to capture more of the value generated by MEV.

An open marketplace for Solana blockspace

The Open Orderflow Auction is intended to create an open marketplace for Solana blockspace in which searchers compete through bids for transaction inclusion. Flowra's design draws on competitive block-building models that have emerged on Ethereum, most prominently MEV-Boost, through which proposers source blocks from competing builders via relays, and where the company said open bidding has contributed to higher proposer revenue. Flowra believes Solana's high-throughput, low-latency architecture could support a similar model.

Solana has no public mempool, and transactions are forwarded directly to the current block leader, which makes private orderflow arrangements a key determinant of which transactions are included and how MEV is captured. To date, much of that activity on Solana has been routed through Jito's block engine, whose bundling and relaying infrastructure anchors the concentrated MEV market that Flowra's open auction model aims to contest.

In early testing on a single validator, a Flowra-enabled setup increased compute units per block by 20.6%, with the validator moving from 84% of the network average to 101%, according to the company. Flowra also reported higher block fees than comparable validator software, together with 100% block production and 99.999% block engine uptime during the test. The company noted that these results are based on early testing rather than a broader network-wide deployment.

Programmable policies give validators more control

Alongside the auction system, Flowra is introducing a Programmable Block Policy, which allows validators to establish their own transaction inclusion policies at the block-building layer. The company said the feature is designed to provide validators with greater operational flexibility, including the ability to meet regulatory and institutional compliance requirements without modifying the underlying Solana protocol.

Flowra recently announced a collaboration with compliance infrastructure provider Honeypot to bring sanctions and risk screening to this layer. According to the announcement, the company's architecture separates these block-building policies from changes to the underlying network protocol. Screening at this layer addresses a gap for institutional staking operations, which face sanctions and illicit-finance requirements that base-layer protocols typically do not handle.

Flowra CEO Harry Hwang said Solana's technical performance has helped make it a leading blockchain network, but its MEV market remains concentrated. "By opening block building to transparent competition, we're creating a more efficient market for blockspace," Hwang said. He added that the system would give validators greater control over block construction while providing verifiability and auditability.

Flowra targets institutional validators

Flowra is currently onboarding institutional-grade validators to its Open Orderflow Auction, with a broader rollout planned as participation in the Solana ecosystem expands. The OOA is now available to validators and searchers participating in the Solana ecosystem, although the company did not provide details on the number of participants currently using the system.

Flowra describes itself as a blockchain infrastructure company focused on validator and orderflow solutions for Solana. Its products include validator infrastructure, delegation programs and MEV-related technologies. The company said its broader objective is to improve transaction transparency, value distribution and incentive alignment among validators, users and builders.

The launch comes as Flowra seeks to apply a more market-based approach to Solana's block-building process. Its initial testing suggests potential improvements in block utilization and validator fees, while the Programmable Block Policy adds a mechanism for validators to customize transaction inclusion. The broader impact of the system will depend on adoption among validators and searchers, and on whether orderflow shifts from established channels, as Flowra expands its rollout across the Solana ecosystem.

Source: CoinJournal