- ArbOS Dia has been launched on Arbitrum One and Nova, introducing changes to gas pricing to mitigate fee spikes and increasing the minimum base fee to 0.02 gwei.
- This upgrade includes support for passkey-ready secp256r1 aligned with Ethereum’s post-Fusaka spec and expands gas tokens for custom chains.
The ArbOS Dia upgrade has been rolled out on Arbitrum One and Arbitrum Nova, focusing on enhancing layer-two fee efficiency, increasing throughput, and updating tools.
Dia introduces changes to how Arbitrum sets the base fee during high demand periods, aiming to make fee adjustments smoother. The default minimum base fee has been raised to 0.02 gwei from 0.01 gwei. This adjustment is similar to Polygon’s EIP-1559 model for fee regulation.
The higher minimum base fee is designed to deter spam-like bot activities and stabilize fee movements during peak usage. The pricing update targets reducing the severity, frequency, and duration of high fees.
The ArbOS Dia upgrade is now live on Arbitrum
Smoother fees when demand spikes
Foundations for higher throughput
Passkeys/biometrics for user onboarding
New interop gas tokens for Arbitrum chains
Ethereum Fusaka upgradeLearn more: https://t.co/QLCvXGwtPb pic.twitter.com/Y1MMexowpy
— Arbitrum (@arbitrum) January 8, 2026
Arbitrum emphasizes the relationship between fee curve adjustments and network economics. The higher base fee minimum can help maintain DAO revenue as the fee curve becomes more predictable. Despite these changes, Arbitrum remains closely aligned with Ethereum as a layer-2 network.
Dia paves the way for increased network throughput on existing hardware by updating Arbitrum’s state transition function to monitor gas consumption across various resource types.
Arbitrum continues to implement upgrades that focus on improving fee efficiency and throughput. In a related development, VeChain users now have access to a new Wanchain bridge enabling transfers of ETH, USDT, and USDC to Arbitrum.
ArbOS Dia Fee Rules and Onboarding Updates
Dia adjusts block packing rules to reduce transaction skipping under heavy loads. A new per-transaction limit allows the last transaction to use up to MaxTxGasLimit, slightly exceeding the prior MaxBlockGasLimit while maintaining overall targets.
For application developers, Dia introduces support for secp256r1 for passkey-style signing in line with Ethereum’s post-Fusaka plans. This update enables developers to implement passkey, face ID, or fingerprint-based user onboarding, along with secure device keys. The update also includes features for recovery processes and enterprise-level authentication.
Furthermore, Dia enhances flexibility for native gas tokens on custom Arbitrum chains through Native Token Mint/Burn, allowing trusted bridge providers to handle minting and burning operations. Supported token standards include LayerZero OFTs, xERC20s, native USDC, and native USDT (USDT0). This feature, however, is not available on Arbitrum One.
Dia also incorporates certain EVM changes from the Fusaka era into Arbitrum chains, such as updated secp256r1 semantics, the CLZ opcode, repricing of ModExp, and BLS12-381 curve operations. On the node side, it introduces support for the eth_config RPC method and implements related networking and history updates as needed.
This upgrade lays the foundation for smoother fees, passkey-based onboarding, and enhanced gas-token interoperability on custom chains. At the time of writing, ARB was trading at $0.208, marking a 4.28% increase over the past 7 days.