Overview

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OP Mainnet, formerly called Optimism, is the main blockchain network in the Optimism ecosystem.

OP Mainnet is a Layer 2 network that operates on top of Ethereum’s architecture. It is designed to be EVM equivalent and as close to Ethereum as possible. The minor differences between building on OP Mainnet and Ethereum are outlined in Optimism’s developer docs.

Network Support

Network	HTTPS	WSS
Mainnet	✅	✅
Testnet (Sepolia)	✅	✅

WebSocket clients MUST respond to server ping frames, otherwise the connection will be closed and re-established every minute.

Getting Started

Send a request to check that your endpoint works. Replace <YOUR_API_KEY_HERE> with the key from your endpoint in the Validation Cloud app.

curl https://mainnet.optimism.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":0}'

curl https://sepolia.optimism.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
    -X POST \
    -H "Content-Type: application/json" \
    -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":0}'

Connect over WebSocket:

wscat -c wss://mainnet.optimism.validationcloud.io/v1/wss/<YOUR_API_KEY_HERE>

wscat -c wss://sepolia.optimism.validationcloud.io/v1/wss/<YOUR_API_KEY_HERE>

Compute Units

Method	Compute units
eth_accounts	20
eth_blockNumber	20
eth_call	40
eth_chainId	10
eth_estimateGas	40
eth_gasPrice	40
eth_getBalance	40
eth_getBlockByHash	40
eth_getBlockByNumber	40
eth_getBlockTransactionCountByHash	40
eth_getBlockTransactionCountByNumber	40
eth_getCode	40
eth_getFilterChanges	40
eth_getFilterLogs	40
eth_getLogs	80
eth_getStorageAt	40
eth_getTransactionByBlockHashAndIndex	40
eth_getTransactionByBlockNumberAndIndex	40
eth_getTransactionByHash	40
eth_getTransactionCount	40
eth_getTransactionReceipt	40
eth_getUncleByBlockHashAndIndex	40
eth_getUncleByBlockNumberAndIndex	40
eth_getUncleCountByBlockHash	40
eth_getUncleCountByBlockNumber	40
eth_newBlockFilter	40
eth_maxPriorityFeePerGas	20
eth_newFilter	40
eth_newPendingTransactionFilter	40
eth_sendRawTransaction	80
eth_subscribe	20
eth_syncing	10
eth_uninstallFilter	20
eth_unsubscribe	20
net_listening	10
net_peerCount	20
net_version	10
web3_clientVersion	40
web3_sha3	40
txpool_content	500

Node API

Account

Endpoints

Admin API

Resources

Chains

Network Support

Getting Started

Compute Units

​Network Support

​Getting Started

​Compute Units

Network Support

Getting Started

Compute Units