BlockBeats news, on May 26, according to official announcements, Optimism has announced that today marks the first adjustment to its transaction ordering rules on the OP mainnet. For many years, the sequencer exclusively used a "highest priority gas fee first" mechanism; it now adds a new staking-based priority ordering option.
This four-week experiment (ending June 23) was approved earlier this month by the Optimism governance body and is optional for users. To participate, users must stake at least 100,000 OP in the PolicyEngineStaking contract.
The experiment will proceed in two phases: Phase 1 (Week 1) uses FIFO (First-In, First-Out) ordering, where staking amounts exceeding the minimum threshold do not affect priority; Phase 2 (Weeks 2–4) switches to a priority gas multiplier mechanism weighted by staking duration, with longer staking periods resulting in higher priority. Transaction ordering for users not participating in the experiment remains unchanged, and the PGA mechanism continues to operate as usual.