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Arbitrum

Arbitrum One is an optimistic Ethereum layer 2 based on Nitro. It supports EVM and Stylus contracts with ETH fees; Nova and other Arbitrum chains can use different configurations. Applications distinguish local execution, data publication and canonical withdrawals to Ethereum, and verify which assets, oracles and operational dependencies exist on the selected chain.

Written by Isaac GonzálezUpdated October 11, 2026

Key takeaways

  • Arbitrum uses rollup technology to run applications on Ethereum.
  • Local operations and withdrawals to Ethereum follow different processes.
  • Design should account for bridges, confirmations and product dependencies.

What is Arbitrum?

Arbitrum includes Arbitrum One, Nova and tools for creating chains with Arbitrum technology. One uses an optimistic rollup design and ETH for gas. Nova has a different data availability model, so assumptions should not be transferred between the two without review.

For an application, selection starts with identifying the actual chain. Shared development tools do not imply identical asset availability, administration, data publication or withdrawal conditions. Those details influence both implementation and the operating procedures needed to support users and resolve incidents.

How it works

Nitro executes transactions and supports verification of chain state through the relevant proof protocol. Sequencer confirmation, publication of data to Ethereum and withdrawal through the canonical bridge are different stages. A withdrawal dispute period does not describe the normal time before an operation appears in the application.

Arbitrum also offers Stylus for WebAssembly contracts alongside Solidity execution. Adoption requires checking SDK support, interoperability and resource use. It does not automatically turn an existing Rust application into a deployable contract without adapting and testing the code.

What Arbitrum offers

One can fit products needing EVM contracts and components available in its ecosystem. A distribution process can reuse standards and libraries while its backend tracks operations, maintains gas funds and reconciles transfers against internal records. Administrative actions need to be included in that workflow.

Before migration from Ethereum, check asset addresses, price sources and permissions of every dependency. Tests should include data publication costs, RPC responses and transaction replacement. The goal is to verify the product's actual journey rather than assume complete equivalence because its code compiles.

Limitations and selection criteria

Chains built with Arbitrum technology can use different settlement and data availability configurations. Operating a dedicated chain also introduces upgrades, observability and bridge support. Compare those responsibilities with deploying contracts on an existing network before choosing the architecture.

Proof mechanisms do not remove sequencing risks, upgrade permissions or application contract defects. Assessment includes asset entry and exit and what happens when a component stops responding. Liquidity for a specific asset should be verified rather than inferred from overall network activity or ecosystem positioning.

Also known as

  • Arbitrum One
  • Arbitrum Nitro
  • ARB
Development at Metlabs

How we approach a project with Arbitrum

Development capabilities and use cases to assess how Arbitrum fits your product.

What we build with Arbitrum at Metlabs

  • Arbitrum One contracts

    EVM implementation and checks of cost, dependencies and operation tracking.

  • Stylus assessment

    WebAssembly contract prototypes and interoperability with EVM components.

  • Use case

    Fund distribution

    Allocations and withdrawals reconciling local and cross-network transactions.

  • Use case

    EVM contract adaptation

    Asset, oracle and tooling checks before extending a product to One.

Related content

Go deeper on Arbitrum

Other Metlabs pages that expand on this entry.

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