Chain ID reference
Arbitrum One chain ID
Arbitrum One mainnet uses chain ID 42161 and gas token ETH. Verify the ID and RPC endpoint against the cited source before adding a wallet network or signing transactions.
Verification record
This page is checked against cited public sources. It is not a live uptime, latency, or production reliability monitor.
- Last checked
- Verification status
- Verified metadata
- Verification run
manual-static-seed-2026-04-30- Verification tool
manual-source-review- Source set
- Arbitrum docs
- Next review
- monthly; after May 30, 2026
Arbitrum One network settings
Arbitrum One is an Ethereum L2. Arbitrum documentation lists the public RPC URL, chain ID 42161, and Arbiscan/Blockscout explorers.
- Chain type
- Optimistic L2 mainnet
- Primary public RPC
https://arb1.arbitrum.io/rpc- Explorer
- https://arbiscan.io
- Verification
- Verified metadata, checked April 30, 2026
- Review cadence
- monthly; next review after May 30, 2026
Wallet and tooling caution
A matching chain ID helps software select the right network, but it does not prove an RPC endpoint is official, private, reliable, or safe. Main.net is an independent reference site and is not affiliated with the listed networks unless explicitly stated.
Compare bridge routes, withdrawal timing, and finality assumptions before moving large balances across rollups.
Sources
These links are the cited source material for the chain ID, RPC URL, explorer, or setup context shown on this page.