Skip to content
Private, independent platform.Private, independent platform: free for clients, funded by a commission paid by vendors.Funding
smart-contract.com
Sign inGet quotes

Directory by blockchain

Arbitrum smart contract audit and development

Building and auditing on Arbitrum, an optimistic rollup on Ethereum: EVM tooling, sequencer and bridge assumptions, L2 specifics and how to prepare.

Arbitrum is a family of optimistic rollups that execute transactions off Ethereum and post the resulting data back to it, with fraud proofs allowing incorrect state to be challenged. For a project, it offers lower transaction costs with the familiar EVM development experience, while adding rollup-specific assumptions that must be understood and reviewed.

Building on Arbitrum

Arbitrum is EVM-compatible: Solidity and Vyper contracts compile with the usual toolchains and most Ethereum code deploys with little change. A sequencer orders transactions, and messages between Ethereum and Arbitrum go through dedicated bridge contracts, with withdrawals to Ethereum subject to a challenge period. Arbitrum also supports contracts compiled to WebAssembly, written in languages such as Rust, which run alongside EVM contracts.

  • Languages: Solidity, Vyper, and Rust through the WebAssembly environment
  • Frameworks: Foundry, Hardhat
  • Differences to check: block number and timestamp semantics, gas accounting that includes the cost of posting data to Ethereum

What auditors look at

  • Sequencer assumptions: behavior if the sequencer is down or delays transactions, and use of sequencer uptime checks with price feeds
  • Cross-chain messaging between Ethereum and Arbitrum: authentication of the sender, address aliasing of L1 contracts, retryable messages that can fail or be redeemed later
  • Time and block dependencies that behave differently from Ethereum mainnet
  • Bridged tokens: which bridge issued the asset and whether the contract assumes a canonical version
  • Classic EVM risks (reentrancy, access control, oracle manipulation), which apply unchanged

Before requesting quotes

  • Specify whether the system is Arbitrum only or also deployed on Ethereum or other rollups, and which parts communicate across chains
  • Describe every L1 to L2 or L2 to L1 message flow and who is allowed to trigger it
  • List the oracles and bridged assets you depend on, and your plan if the sequencer is unavailable
  • Indicate whether any code uses the WebAssembly environment, as it requires reviewers with Rust experience

Arbitrum smart contract auditors

  • 4soft

    Public informationPoland

    Wrocław software house for blockchain development, on-chain analytics and crypto compliance

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Polygon · BNB Chain · +4 more

  • Blaize

    Public informationUkraine

    Ukrainian blockchain development company with a dedicated security audit practice

    • Development
    • Audit

    Ethereum · Polygon · Arbitrum · Solana · Sui · +4 more

  • BlockSec

    Public information

    Web3 security company offering smart contract and infrastructure audits plus threat monitoring

    • Audit

    Ethereum · Arbitrum · BNB Chain · Sui

  • Chainscore Labs

    Public informationIndia

    Pune blockchain engineering studio building DeFi protocols, wallets and node clients

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Polygon · Polkadot

  • Coinspect

    Public information

    Web3 security firm: smart contract, L1/L2 protocol and source code audits, penetration testing

    • Audit
    • Penetration testing

    Ethereum · BNB Chain · Polygon · Optimism · ZKsync · +2 more

  • Cyfrin

    Public information

    Smart contract audits, penetration testing and security education, maker of Aderyn and Solodit

    • Audit
    • Penetration testing

    Ethereum · ZKsync · Arbitrum · Avalanche · BNB Chain · +8 more

  • INC4

    Public informationUkraine

    Kyiv engineering studio whose Blockchain Hub builds L1s, DeFi protocols and smart contracts

    • Development
    • Audit

    Ethereum · Base · Arbitrum · BNB Chain · Polygon · +1 more

  • iosiro

    Public informationSouth Africa

    South African security firm offering smart contract audits, penetration testing and threat modeling

    • Audit
    • Penetration testing

    Ethereum · Arbitrum

  • Macro

    Public information

    Boutique firm auditing smart contracts and Solana programs, with protocol development

    • Audit
    • Development

    Ethereum · Solana · Optimism · Arbitrum · Base

  • Metlabs

    Public informationSpain

    Spanish blockchain-only development company focused on RWA tokenization and smart contracts

    • Development
    • Audit

    Ethereum · Polygon · BNB Chain · Arbitrum · Solana

  • Omniscia

    Public informationBulgaria

    Blockchain security firm auditing Solidity smart contracts, with web-based public reports

    • Audit

    Ethereum · Polygon · Arbitrum · Base · BNB Chain · +3 more

  • OpenZeppelin

    Public informationUnited Kingdom

    Smart contract security audits and the open-source OpenZeppelin Contracts library

    • Audit

    Ethereum · Arbitrum · Optimism · Base · ZKsync · +2 more

  • Pashov Audit Group

    Public information

    Remote team of security researchers auditing EVM, Solana and Move smart contracts

    • Audit

    Ethereum · Solana · Arbitrum · Optimism · Base · +3 more

  • Quantstamp

    Public information

    Web3 security firm offering smart contract audits, economic analysis and infrastructure tests

    • Audit
    • Penetration testing

    Ethereum · Solana · Polygon · TON · Avalanche · +3 more

  • QuillAudits

    Public information

    Smart contract audit firm also offering dApp penetration testing, wallet audits and monitoring

    • Audit
    • Penetration testing

    Ethereum · NEAR · BNB Chain · Polygon · Optimism · +8 more

  • Rather Labs

    Public informationUnited States

    Web3 and AI engineering firm with a Buenos Aires team, building and auditing smart contracts

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Optimism · Polygon · +5 more

  • Salus

    Public information

    Web3 security firm offering smart contract audits, penetration testing and zero-knowledge services

    • Audit
    • Penetration testing

    Ethereum · BNB Chain · Polygon · Arbitrum · Avalanche

  • ScaleBit

    Public information

    Web3 security team auditing smart contracts, dApps and blockchains, with a Bitcoin layer 2 focus

    • Audit

    Ethereum · Arbitrum · BNB Chain · Solana · Polygon · +3 more

  • softstack

    Public informationGermany

    Flensburg Web3 company offering smart contract audits, pentests, development and compliance

    • Development
    • Audit
    • Penetration testing

    Ethereum · Arbitrum · Optimism · Base · Polygon · +8 more

  • Three Sigma

    Public information

    Code security audits and economic audits for Web3 protocols, in Solidity, Rust and Move

    • Audit

    Ethereum · Arbitrum · Polygon · Base · Optimism · +4 more

  • Trail of Bits

    Public informationUnited States

    Security firm reviewing smart contracts, nodes and bridges, maker of Slither and Echidna

    • Audit
    • Penetration testing

    Ethereum · Arbitrum · Optimism · Solana · Sui · +4 more

  • Veridise

    Public information

    Smart contract and zero-knowledge audits backed by formal methods and in-house tools

    • Audit

    Ethereum · Arbitrum · Optimism · Base · Polygon

  • Zealynx

    Public informationPoland

    Polish security firm offering smart contract audits, dApp pentesting and AI security reviews

    • Audit
    • Penetration testing
    • Development

    Ethereum · Arbitrum · Polygon · BNB Chain · Base · +4 more

  • Zokyo

    Public informationUnited Arab Emirates

    Smart contract and protocol audits, pentesting, compliance and product development, Dubai

    • Audit
    • Penetration testing
    • Development

    Ethereum · Solana · Polygon · Arbitrum · Optimism · +9 more

Arbitrum smart contract developers

  • 4soft

    Public informationPoland

    Wrocław software house for blockchain development, on-chain analytics and crypto compliance

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Polygon · BNB Chain · +4 more

  • Blaize

    Public informationUkraine

    Ukrainian blockchain development company with a dedicated security audit practice

    • Development
    • Audit

    Ethereum · Polygon · Arbitrum · Solana · Sui · +4 more

  • Chainscore Labs

    Public informationIndia

    Pune blockchain engineering studio building DeFi protocols, wallets and node clients

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Polygon · Polkadot

  • INC4

    Public informationUkraine

    Kyiv engineering studio whose Blockchain Hub builds L1s, DeFi protocols and smart contracts

    • Development
    • Audit

    Ethereum · Base · Arbitrum · BNB Chain · Polygon · +1 more

  • Labrys

    Public informationAustralia

    Brisbane product studio building smart contracts, DeFi protocols and full Web3 products

    • Development

    Ethereum · Base · Arbitrum · Optimism · Polygon · +1 more

  • Lampros Tech

    Public informationIndia

    Ahmedabad engineering firm building Ethereum and Layer 2 smart contracts, dApps and DAO tooling

    • Development

    Ethereum · Arbitrum · Optimism · Base

  • Macro

    Public information

    Boutique firm auditing smart contracts and Solana programs, with protocol development

    • Audit
    • Development

    Ethereum · Solana · Optimism · Arbitrum · Base

  • Metlabs

    Public informationSpain

    Spanish blockchain-only development company focused on RWA tokenization and smart contracts

    • Development
    • Audit

    Ethereum · Polygon · BNB Chain · Arbitrum · Solana

  • Rather Labs

    Public informationUnited States

    Web3 and AI engineering firm with a Buenos Aires team, building and auditing smart contracts

    • Development
    • Audit

    Ethereum · Arbitrum · Base · Optimism · Polygon · +5 more

  • RedDuck

    Public informationUkraine

    Web3 engineering partner writing audit-ready smart contracts on EVM chains, Solana and Bitcoin

    • Development

    Ethereum · Polygon · BNB Chain · Arbitrum · Base · +6 more

  • softstack

    Public informationGermany

    Flensburg Web3 company offering smart contract audits, pentests, development and compliance

    • Development
    • Audit
    • Penetration testing

    Ethereum · Arbitrum · Optimism · Base · Polygon · +8 more

  • Zealynx

    Public informationPoland

    Polish security firm offering smart contract audits, dApp pentesting and AI security reviews

    • Audit
    • Penetration testing
    • Development

    Ethereum · Arbitrum · Polygon · BNB Chain · Base · +4 more

  • Zokyo

    Public informationUnited Arab Emirates

    Smart contract and protocol audits, pentesting, compliance and product development, Dubai

    • Audit
    • Penetration testing
    • Development

    Ethereum · Solana · Polygon · Arbitrum · Optimism · +9 more

  • Zpoken

    Public informationEstonia

    Senior crypto engineering team for L1 consensus, zero-knowledge, DeFi mechanisms and stablecoins

    • Development

    Ethereum · Solana · NEAR · Arbitrum · Base · +1 more

All Arbitrum vendors in the directoryApply or claim a listing

Describe your project once. Compare with confidence.

Get comparable quotes from vetted developers, then secure your code with an independent auditor.

Get quotes

Free for clients. No commitment.