Arbitrum’s ArbOS Dia Goes Live With Passkeys, Better Fees, and Interop Gas Tokens

• ArbOS Dia went live on Arbitrum One and Nova, updating gas pricing to smooth fee spikes and raising the minimum base fee to 0.02 gwei.
• The upgrade adds passkey-ready secp256r1 support aligned with Ethereum’s post-Fusaka spec and expands custom-chain gas tokens.

Arbitrum has released the ArbOS Dia upgrade for Arbitrum One and Arbitrum Nova. The upgrade targets smoother layer-two fees, higher throughput, and updated tooling. 

Dia changes how Arbitrum sets the layer-two base fee during demand spikes. It replaces one gas target and one adjustment window with several higher targets and longer windows. Arbitrum also increased the default minimum base fee to 0.02 gwei from 0.01 gwei. As CNF reported, Polygon’s EIP-1559 model similarly adjusts fees upwards.

The project said the higher minimum raises the cost of spam-style bot activity. It also aims to keep fee moves steadier when usage rises. More so, the pricing update targets lower severity, lower frequency, and shorter duration of high fees.

Arbitrum also linked the fee curve change to network economics. The higher minimum base fee can help balance DAO revenue as the curve becomes smoother. However, the upgrade does not change Arbitrum’s role as an Ethereum-aligned layer-2 network.

Dia also prepares the network for more throughput on similar hardware. It updates Arbitrum’s state transition function to track gas across resource types. These include computation, storage access, storage growth, and history growth.

Arbitrum has been rolling out upgrades focused on smoother fees and higher throughput. In a similar development, we covered that VeChain users gained a new Wanchain bridge that allows transfers of ETH, USDT, and USDC to Arbitrum.

ArbOS Dia Fee Rules and Onboarding Updates

Dia adjusts block packing rules to reduce skipped transactions under load. A new per-transaction limit lets the last transaction use up to MaxTxGasLimit. It may slightly exceed the prior MaxBlockGasLimit while keeping overall targets unchanged.

For app teams, Dia updates support for secp256r1 so that passkey-style signing matches Ethereum’s planned post-Fusaka behavior. Developers can build onboarding with passkeys, face ID or fingerprint prompts, and device-secured keys. The update also supports recovery flows and enterprise authentication layers.

Moreover, Dia adds more flexibility for native gas tokens on custom Arbitrum chains through Native Token Mint/Burn. It allows a chain to delegate minting and burning to a trusted bridge provider. Supported standards include LayerZero OFTs, xERC20s, native USDC, and native USDT, also referenced as USDT0. However, this feature will not be available on Arbitrum One.

Dia also brings selected Fusaka-era EVM changes into Arbitrum chains. These include updated secp256r1 semantics, the CLZ opcode, ModExp repricing, and BLS12-381 curve operations. On the node side, it adds support for the eth_config RPC method and applies related networking and history updates where relevant.

The rollout sets a base for smoother fees, passkey onboarding, and broader gas-token interoperability on custom chains. At the time of reporting, ARB traded at $0.208, up 4.28% over the past 7 days.