Arbitrum

Assist with Arbitrum One transactions, bridging, gas optimization, and L2 ecosystem navigation.

Security Scan

This is an instruction-only Arbitrum reference: the guidance matches the described purpose and it requests no installs, credentials, or system access.

Purpose & Capability

The name/description (Arbitrum onboarding, bridging, gas, L2 guidance) matches the SKILL.md content; nothing in the skill asks for unrelated resources or capabilities.

Instruction Scope

SKILL.md contains static, user-facing guidance and troubleshooting for Arbitrum networks; it does not instruct the agent to read local files, access environment variables, call external endpoints, or exfiltrate data.

Install Mechanism

No install specification and no bundled code — instruction-only skills have minimal surface area and nothing will be written or executed on the host by an installer.

Credentials

The skill declares no required environment variables, credentials, or config paths; there are no requests for unrelated keys or secrets.

Persistence & Privilege

always is false (default), the skill is user-invocable and may be called autonomously per platform defaults; it does not request persistent or elevated privileges.

Assessment

This skill is a static reference about Arbitrum and appears internally consistent and low-risk because it doesn't install code or request credentials. You should still: (1) verify bridge URLs (use official sites like bridge.arbitrum.io), (2) treat operational guidance as possibly dated (the blockchain ecosystem changes rapidly), and (3) avoid relying on the skill for any automated on-chain actions without independent verification. If you need automated transactions or wallet integration, prefer a skill that explicitly documents required credentials and signing behavior.

Network Basics

• Arbitrum One is an optimistic rollup — L2 scaling for Ethereum
• EVM equivalent — same tools, wallets, contracts as Ethereum
• ETH is the gas token — not a separate token
• ARB is governance token — not used for gas
• Same addresses as Ethereum — but different network, different balances

Bridging

• Official bridge: bridge.arbitrum.io — most secure
• Deposits (L1→L2): ~10 minutes — after Ethereum confirmation
• Withdrawals (L2→L1): 7 days — optimistic rollup security delay
• Third-party bridges faster — Hop, Across, Stargate, but add risk
• Always bridge some ETH first — need gas on Arbitrum

The 7-Day Withdrawal

• Optimistic rollups assume transactions valid — fraud proofs during 7 days
• Cannot speed up native bridge withdrawal — security requirement
• Plan ahead for exits — don't bridge if you need funds in <7 days
• Third-party bridges use liquidity — faster but fees apply
• Withdrawal can be claimed after 7 days — requires L1 transaction

Gas and Fees

• Much cheaper than Ethereum mainnet — typically 10-50x lower
• Two components: L2 execution + L1 data posting
• L1 data costs can spike — when Ethereum is congested
• Gas prices in gwei — same units as Ethereum
• Fast blocks — ~0.25 seconds

ARB Token

• Governance token — vote on DAO proposals
• Not used for gas — ETH pays for transactions
• Airdropped to early users — claiming period ended
• Staking coming — ARB staking in development
• Available on major exchanges — high liquidity

DeFi Ecosystem

• GMX — largest perps DEX on Arbitrum
• Uniswap, SushiSwap — major DEXs deployed
• Aave, Radiant — lending protocols
• Camelot — native Arbitrum DEX
• Significant TVL — billions in value locked

Wallet Configuration

• MetaMask works natively — add network from chainlist.org
• Chain ID: 42161 — RPC: https://arb1.arbitrum.io/rpc
• Block explorer: arbiscan.io — verify transactions
• Same seed as Ethereum — different network selection

Arbitrum Nova

• Separate chain from Arbitrum One — optimized for gaming/social
• Lower fees than One — less security guarantees
• Different bridge — don't confuse with One
• Chain ID: 42170 — verify you're on correct chain

Stylus

• Run Rust, C, C++ contracts — not just Solidity
• WASM-based execution — alongside EVM
• Coming feature — expands developer options
• Same security as EVM contracts — audited runtime

Common Issues

• "Insufficient ETH for gas" — need ETH, not just tokens
• Wrong network — sent to Arbitrum address on Ethereum (recoverable but complex)
• Withdrawal pending — 7-day wait is normal, not stuck
• Transaction reverted — check slippage, approvals, balance
• "Network not found" — add Arbitrum network to wallet

Sequencer

• Single sequencer currently — Offchain Labs operated
• Centralization concern — decentralization roadmap exists
• Sequencer can't steal funds — only order transactions
• If sequencer down — delayed but not lost, can force include
• Decentralized sequencer coming — DAO governance

Security

• Same security as Ethereum for assets — after 7-day challenge period
• Smart contracts same risks — audit status matters
• Fraud proof protects users — invalid state transitions challenged
• Bridge is secured by Ethereum — L1 is the settlement layer
• Use official bridge for large amounts — third-party bridges add risk