# Overview

Arbitrum One is a Layer-2 scaling solution for Ethereum that uses optimistic rollups to enable faster and cheaper transactions while inheriting Ethereum’s security. 

Fully compatible with the Ethereum Virtual Machine (EVM), Arbitrum One allows developers to deploy existing Ethereum dApps with minimal changes and benefit from greater scalability.

Block explorer: <https://arbiscan.io/>

## Network Support

| Network                        | HTTPS | WSS |
| ------------------------------ | ----- | --- |
| Arbitrum One Mainnet           | ✅     | ✅   |
| Arbitrum One Testnet (Sepolia) | ✅     | ✅   |

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

## Compute Units

<table data-header-hidden><thead><tr><th></th><th width="100"></th></tr></thead><tbody><tr><td>debug_traceBlockByHash</td><td>80</td></tr><tr><td>debug_traceBlockByNumber</td><td>80</td></tr><tr><td>debug_traceCall</td><td>80</td></tr><tr><td>debug_traceTransaction</td><td>80</td></tr><tr><td>eth_accounts</td><td>20</td></tr><tr><td>eth_blockNumber</td><td>20</td></tr><tr><td>eth_call</td><td>40</td></tr><tr><td>eth_chainId</td><td>10</td></tr><tr><td>eth_estimateGas</td><td>40</td></tr><tr><td>eth_gasPrice</td><td>40</td></tr><tr><td>eth_getBalance</td><td>40</td></tr><tr><td>eth_getBlockByHash</td><td>40</td></tr><tr><td>eth_getBlockByNumber</td><td>40</td></tr><tr><td>eth_getBlockTransactionCountByHash</td><td>40</td></tr><tr><td>eth_getBlockTransactionCountByNumber</td><td>40</td></tr><tr><td>eth_getCode</td><td>40</td></tr><tr><td>eth_getFilterChanges</td><td>40</td></tr><tr><td>eth_getFilterLogs</td><td>40</td></tr><tr><td>eth_getLogs</td><td>80</td></tr><tr><td>eth_getStorageAt</td><td>40</td></tr><tr><td>eth_getTransactionByBlockHashAndIndex</td><td>40</td></tr><tr><td>eth_getTransactionByBlockNumberAndIndex</td><td>40</td></tr><tr><td>eth_getTransactionByHash</td><td>40</td></tr><tr><td>eth_getTransactionCount</td><td>40</td></tr><tr><td>eth_getTransactionReceipt</td><td>40</td></tr><tr><td>eth_getUncleByBlockHashAndIndex</td><td>40</td></tr><tr><td>eth_getUncleByBlockNumberAndIndex</td><td>40</td></tr><tr><td>eth_getUncleCountByBlockHash</td><td>40</td></tr><tr><td>eth_getUncleCountByBlockNumber</td><td>40</td></tr><tr><td>eth_maxPriorityFeePerGas</td><td>20</td></tr><tr><td>eth_newBlockFilter</td><td>40</td></tr><tr><td>eth_newFilter</td><td>40</td></tr><tr><td>eth_newPendingTransactionFilter</td><td>40</td></tr><tr><td>eth_sendRawTransaction</td><td>80</td></tr><tr><td>eth_subscribe</td><td>20</td></tr><tr><td>eth_syncing</td><td>10</td></tr><tr><td>eth_uninstallFilter</td><td>20</td></tr><tr><td>eth_unsubscribe</td><td>20</td></tr><tr><td>net_listening</td><td>10</td></tr><tr><td>net_peerCount</td><td>20</td></tr><tr><td>net_version</td><td>10</td></tr><tr><td>web3_clientVersion</td><td>40</td></tr><tr><td>web3_sha3</td><td>40</td></tr></tbody></table>