Arbitrum says ArbOS Elara is live on the Arbitrum Platform after governance approval. For dedicated blockchains, the upgrade adds protocol-level compliance filtering, customizable priority fees and an Alternative Data Availability API. Compliance policies can run at the sequencer and state-transition layers before execution, while the chain owner receives records of filtered transactions through an API for review and auditing.
Priority-fee support also belongs to dedicated chains and provides a base capability for more configurable transaction ordering and fee markets. Arbitrum explicitly separates this from a potential Priority Gas Auction on Arbitrum One, which is being discussed through its own governance process and should not be treated as automatically activated by Elara. The AltDA API lets operators integrate data-availability providers without maintaining custom Nitro forks; Arbitrum One is not expected to use it because its transactions settle on Ethereum L1.
On Arbitrum One, Elara introduces BaseFeeManager. Offchain receives limited authority to adjust the minimum L2 base fee only within a DAO-approved range of 0.01–0.10 gwei; the authority is bounded, public and removable through governance. Stylus contract code-size capacity also rises from 24KB to 96KB, making larger Rust applications easier to deploy.
For ARB, the useful analysis separates platform rollout from token-price narratives. Elara’s technical effect should be measured through dedicated-chain adoption, Arbitrum One fee behavior and Stylus application compatibility rather than the upgrade name alone.