Optimism tests stake-based transaction priority on OP Mainnet

Optimism has launched a temporary experiment on OP Mainnet that gives eligible OP token stakers preferential transaction ordering. It introduces a new form of token utility tied directly to blockchain blockspace access. The four-week experiment began on 26 May and marks the first stake-based transaction ordering system deployed on an OP Stack chain. Under the proposal, users who stake OP through Optimism's PolicyEngineStaking contract can receive transaction ordering advantages over non-stakers. The experiment replaces the standard "priority gas auction" model, where users compete mainly through higher transaction fees. OP staking now affects transaction ordering The rollout will happen in two phases. During Phase 1, wallets with at least 100,000 OP staked receive strict first-in-first-out transaction ordering for up to one week. Additional stake above the threshold provides no extra benefit. Phase 2 then introduces stake-weighted ordering for up to three additional weeks. Under that system, larger stakers receive a multiplier on their effective priority fees, capped at 3x. Optimism said the model uses a square-root formula to create diminishing returns for larger holders rather than unlimited prioritization power. The protocol also stated that staking remains non-custodial, with no lockups or cooldown periods on unstaking. Optimism experiments with new sequencer economics The proposal represents a broader attempt to rethink how Layer 2 blockspace gets allocated. Rather than relying entirely on gas bidding wars, the experiment allows token staking to influence transaction sequencing and ordering priority. That could have major implications for: market makers, arbitrage traders, MEV searchers, and other high-frequency on-chain participants. The mechanism also creates direct economic utility for the OP token beyond governance participation. Proposal raises fairness concerns The experiment may also trigger criticism around fairness and centralization. Because larger token holders can receive transaction advantages, some market participants may view the system as introducing a "pay-for-priority" model tied to token ownership. Optimism acknowledged the risks in its documentation and repeatedly described ordering guarantees as "best-effort" rather than absolute. The network also said OP Mainnet will automatically revert to normal transaction ordering after the four-week testing window concludes. Final Summary Optimism launched a four-week experiment allowing eligible OP stakers to receive priority transaction ordering on OP Mainnet. The proposal introduces stake-weighted sequencing mechanics that could reshape how Layer 2 blockspace gets allocated.