What is the Arbitrum RPC URL?

Arbitrum One mainnet RPC URL is https://arb1.arbitrum.io/rpc.

Where can I copy Arbitrum wallet config?

Use the Main.net status page copy path at /status/arbitrum-one/#copy-ready-config. It renders wallet_addEthereumChain JSON from the reviewed chain ID, RPC URL, explorer, and gas token fields.

Where are the Arbitrum source docs?

Arbitrum One source links are listed on this page and on /status/arbitrum-one/. Verify them before using the settings in a wallet, script, or app.

Guide

Copy Arbitrum One chain ID and RPC URL

Arbitrum One mainnet uses chain ID 42161 / 0xa4b1, RPC URLhttps://arb1.arbitrum.io/rpc, explorer https://arbiscan.io, and ETH as the gas token. Build generated Jul 20, 2026, 4:21 PM UTC; the source evidence snapshot is labeled July 4, 2026.

Quick settings

Arbitrum chain ID quick answer

Use 42161 / 0xa4b1 for Arbitrum One mainnet, with RPC URLhttps://arb1.arbitrum.io/rpc, explorer https://arbiscan.io, and ETH as the gas token. The canonical indexed page for this chain is/status/arbitrum-one/, with the copy-ready config at/status/arbitrum-one/#copy-ready-config. Verify the fields against the linked source docs before using them in a wallet, script, or app.

Copy Arbitrum One config RPC and explorer Official docs and sources ETH gas token

Good fit when you need:

Arbitrum One chain ID 42161 / 0xa4b1 for wallet or RPC setup;
the public RPC URL, explorer, gas token, and official/source docs together;
wallet config text without connecting a wallet.

NetworkArbitrum One

Chain ID42161 / 0xa4b1

RPC URLhttps://arb1.arbitrum.io/rpc

Explorerhttps://arbiscan.io

Gas tokenETH

Source snapshotJuly 4, 2026

Source docsArbitrum docs

Copy configStatus page config

Verification record

Automated source snapshots and recorded probe evidence are tracked separately. The source snapshot timestamp is not a manual review date. This is not a live uptime, latency, or production reliability monitor. If a recorded public RPC probe fails, verify the source links and current endpoint availability before changing production configuration.

Automated source snapshot: July 4, 2026
Verification status: Verified metadata
Source snapshot run: source-monitoring-2026-07-04
Source snapshot tool: source-monitoring-refresh
Source set: Arbitrum docs
Latest recorded chain ID probe: eth_chainId matched expected 0xa4b1; observed 0xa4b1 on Jul 20, 2026

Methodology Report a correction

Arbitrum One wallet-add fields

Use these manual fields when comparing Main.net with wallet directory entries or source documentation before calling wallet_addEthereumChain.

chainId: 0xa4b1 (42161)
nativeCurrency: ETH; name ETH, symbol ETH, decimals 18
rpcUrls: https://arb1.arbitrum.io/rpc
blockExplorerUrls: https://arbiscan.io

Arbitrum One mainnet settings

RPC URL: https://arb1.arbitrum.io/rpc
Explorer: https://arbiscan.io
Chain ID: 42161
Chain ID hex: 0xa4b1
Currency symbol: ETH
Official/source docs: Arbitrum docs

Arbitrum One EIP-3085 config JSON

Ready-to-copy wallet_addEthereumChain parameters generated from the fields above. Main.net does not connect wallets or request permissions.

Copy-ready JSON

Review source documentation before using this in an app or wallet flow.

{
  "chainId": "0xa4b1",
  "chainName": "Arbitrum One",
  "nativeCurrency": {
    "name": "ETH",
    "symbol": "ETH",
    "decimals": 18
  },
  "rpcUrls": [
    "https://arb1.arbitrum.io/rpc"
  ],
  "blockExplorerUrls": [
    "https://arbiscan.io"
  ]
}

Official docs and source links

Main.net links to source documentation for verification. It does not rank RPC providers or make uptime, latency, privacy, or production reliability claims about public endpoints.

Arbitrum RPC endpoints

Setup caution

Compare bridge routes, withdrawal timing, and finality assumptions before moving large balances across rollups.

Always verify important details in official documentation before configuring software that may sign transactions. Use the status page copy path for the current reviewed config:/status/arbitrum-one/#copy-ready-config.

Arbitrum One chain ID FAQ

What is Arbitrum chain ID?: Arbitrum One mainnet uses chain ID 42161 / 0xa4b1.
What is the Arbitrum RPC URL?: Arbitrum One mainnet RPC URL is https://arb1.arbitrum.io/rpc.
Where can I copy Arbitrum wallet config?: Use the Main.net status page copy path at /status/arbitrum-one/#copy-ready-config. It renders wallet_addEthereumChain JSON from the reviewed chain ID, RPC URL, explorer, and gas token fields.
Where are the Arbitrum source docs?: Arbitrum One source links are listed on this page and on /status/arbitrum-one/. Verify them before using the settings in a wallet, script, or app.

Related references

Use these pages to check the same Arbitrum One fields from the status page, chain ID list, and RPC list.

Indexed status pageArbitrum One statusCanonical chain profile with source links, copy fields, and monitoring evidence.GuideChain ID listReviewed decimal and hex chain IDs across Main.net.GuideMainnet RPC listPublic RPC endpoints, explorers, gas tokens, and source documentation.