Optimism has initiated a four-week test on the OP Mainnet, introducing a staking-based transaction prioritization system. This trial, which began on May 26, allows OP token stakers to gain higher transaction sequencing priority, extending OP's utility from governance to on-chain block space allocation. The test is divided into two phases: the first phase, lasting up to one week, gives strict first-come, first-served priority to wallets staking at least 100,000 OP. The second phase, lasting up to three weeks, implements a weighting system where larger stakes increase the user's priority fee multiplier, capped at 3x. This new mechanism replaces the traditional "priority gas auction" model, where users competed for transaction priority by paying higher fees. Instead, it incorporates token staking into the ordering process, impacting market makers, arbitrage traders, and other high-frequency trading entities. Optimism aims to explore whether Layer 2 block space can be allocated through a combination of staking and fees, potentially raising discussions about fairness and centralization. After the test, OP Mainnet will revert to its standard transaction sequencing method.