Guide

OP Mainnet chain ID and RPC URL

OP Mainnet mainnet uses chain ID 10 / 0xa, RPC URL https://mainnet.optimism.io, explorer https://explorer.optimism.io, and ETH as the gas token.

Answer first

Optimism chain ID quick answer

Use 10 / 0xa for OP Mainnet mainnet, with RPC URL https://mainnet.optimism.io, explorer https://explorer.optimism.io, and ETH as the gas token. The canonical indexed page for this chain is /status/op-mainnet/.

Copy OP Mainnet config RPC and explorer Official docs and sources ETH gas token

Network OP Mainnet

Chain ID 10 / 0xa

RPC URL https://mainnet.optimism.io

Explorer https://explorer.optimism.io

Gas token ETH

Checked April 30, 2026

OP Mainnet mainnet settings

RPC URL: https://mainnet.optimism.io
Explorer: https://explorer.optimism.io
Chain ID: 10
Chain ID hex: 0xa
Currency symbol: ETH
Source docs: Optimism docs

OP Mainnet EIP-3085 config JSON

Text-only wallet_addEthereumChain parameters generated from reviewed fields. 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": "0xa",
  "chainName": "OP Mainnet",
  "nativeCurrency": {
    "name": "ETH",
    "symbol": "ETH",
    "decimals": 18
  },
  "rpcUrls": [
    "https://mainnet.optimism.io"
  ],
  "blockExplorerUrls": [
    "https://explorer.optimism.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.

Connecting to OP Mainnet OP Stack RPC directory

Setup caution

Optimism labels public RPC URLs as rate-limited. Use them for development or light checks, not production-grade app reliability.

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/op-mainnet/#copy-ready-config.