OP Stack networks and public RPC endpoints

Learn about the different OP Stack networks and public RPC endpoints.

This reference guide provides a listing of the different OP Stack networks and public RPC endpoints.

The public RPC URLs provided below are rate limited and do not support websocket connections. If you are experiencing rate limiting issues or need websocket functionality, consider running your own node or signing up for a third-party RPC provider.

OP Mainnet

Parameter	Value
Network Name	OP Mainnet
Chain ID	10
Currency Symbol1	ETH
Explorer	https://explorer.optimism.io
Public RPC URL	https://mainnet.optimism.io
Sequencer URL2	https://mainnet-sequencer.optimism.io
Flashblocks websocket URL 3	wss://op-mainnet-fb-ws-pub.optimism.io/ws
Contract Addresses	Refer to the Contract Addresses page
Connect Wallet	Click here to connect your wallet to OP Mainnet

1. The “currency symbol” is required by some wallets like MetaMask.
2. The sequencer URL is write only.
3. Strictly rate-limited public URL. Please rely on Ethereum JSON RPC or reach out to the Optimism team for a more relaxed private endpoint.

OP Sepolia

Parameter	Value
Network Name	OP Sepolia
Chain ID	11155420
Currency Symbol1	ETH
Explorer	https://testnet-explorer.optimism.io
Public RPC URL	https://sepolia.optimism.io
Flashblocks websocket URL 3	wss://op-sepolia-fb-ws.optimism.io/ws
Sequencer URL2	https://sepolia-sequencer.optimism.io
Contract Addresses	Refer to the Contract Addresses page
Connect Wallet	Click here to connect your wallet to OP Sepolia

1. The “currency symbol” is required by some wallets like MetaMask.
2. The sequencer URL is write only.
3. Strictly rate-limited public URL. Please rely on Ethereum JSON RPC or reach out to the Optimism team for a more relaxed private endpoint.