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ARB 从 Timeboost 到单笔交易竞价：Arbitrum 升级排序机制
Arbitrum 已用优先气体拍卖（Priority Gas Auctions, PGA）取代了原有的 Timeboost 交易排序系统，并在 Arbitrum One 上推出了互补的付费数据服务 Fast Feed。此次变更于 9 月 24 日正式生效，标志着自 2025 年 4 月上线以来仅运行数月的旧系统正式落幕。
PGA 机制详解
PGA 允许用户和应用程序通过标准 EIP-1559 费用字段为单笔交易附加优先费，从而竞争更早的交易执行权。每个 250 毫秒的区块包含两个 125 毫秒的 PGA 轮次，每轮内的交易按优先费高低进行排序。
该设计刻意保持了熟悉感：竞价发生在单笔交易层面，即时发生，利用标准的 EIP-1559 字段，无需注册单独的拍卖流程，也无需提前预测结果。
在旧的 Timeboost 模式下，系统采用密封出价、第二价格拍卖的方式出售 60 秒的快速通道，其余交易则遵循先到先得的顺序。这种模式因权力集中在少数参与者手中而受到批评。研究表明，Timeboost 下的快速通道控制权高度集中，三个实体赢得了 99.74% 的拍卖份额。
Fast Feed、DAO 收入及未来展望
Fast Feed is a paid data streaming service that allows subscribers to obtain sorted sequencer data in real time during block construction rather than waiting for the block to complete. Its main service targets include traders, market makers, aggregators and other delay-sensitive on-chain applications.
PGA generates revenue through priority fees paid by all users, while Fast Feed captures willingness to pay from institutional participants who value speed. Together, the two provide the Arbitrum DAO with two independent sources of revenue related to transaction sequencing and data availability.
Fast Feed subscription revenue is distributed as follows: 97% goes to the Arbitrum DAO treasury and 3% goes to the Arbitrum Developers Guild.
Community-Driven Transformation
This transformation is community-driven, not just a unilateral decision by Offchain Labs. The transition from Timeboost to the PGA went through a full constitutional AIP process and received overwhelming community support through an on-chain vote in June 2026.
The Arbitrum One is the first Arbitrum chain to integrate PGA and Fast Feed, but dedicated chains built using the Arbitrum platform can also implement these functions.
For decentralized finance (DeFi) protocols built on Arbitrum, implementing 125 ms bidding rounds in 250 ms blocks may improve the execution quality of automated market makers (AMMs), lending protocols, and any applications where transaction sequencing directly affects user outcomes.
