> ## Documentation Index
> Fetch the complete documentation index at: https://docs.validationcloud.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Overview

export const logo_0 = "/nodeapi/assets/chains/arbitrum.svg"

export const chain_0 = "Arbitrum"

<span className="chain-logo-arbitrum" />

<img className="page-cover" src="https://mintcdn.com/validation-cloud/QajBabafGojozKj4/nodeapi/assets/arbitrum.jpg?fit=max&auto=format&n=QajBabafGojozKj4&q=85&s=db97b67238ab3fb8d221c607149b7657" alt="" noZoom width="1990" height="480" data-path="nodeapi/assets/arbitrum.jpg" />

<div className="not-prose my-8 flex flex-col gap-4 rounded-2xl border border-gray-950/10 p-5 sm:flex-row sm:items-center dark:border-white/10">
  <img src={logo_0} alt="" className="h-10 w-10 shrink-0" noZoom />

  <div className="flex-1">
    <p className="m-0 font-semibold text-gray-900 dark:text-gray-100">Start building on {chain_0} for free</p>
    <p className="m-0 mt-1 text-sm text-gray-600 dark:text-gray-400">Create an endpoint in under a minute. The Free plan includes 50 million compute units a month, and no credit card is required.</p>
  </div>

  <a href="https://app.validationcloud.io/auth/signup?returnTo=%2Fnode%2Fcreate-endpoint" className="shrink-0 rounded-full bg-primary px-5 py-2 text-center text-sm font-semibold text-white no-underline hover:opacity-90">Try free</a>
</div>

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/](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.

## 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](https://app.validationcloud.io/node).

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://mainnet.arbitrum.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":0}'
  ```

  ```bash title="testnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  curl https://sepolia.arbitrum.validationcloud.io/v1/<YOUR_API_KEY_HERE> \
      -X POST \
      -H "Content-Type: application/json" \
      -d '{"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":0}'
  ```
</CodeGroup>

Connect over WebSocket:

<CodeGroup>
  ```bash title="mainnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  wscat -c wss://mainnet.arbitrum.validationcloud.io/v1/wss/<YOUR_API_KEY_HERE>
  ```

  ```bash title="testnet" theme={"theme":{"light":"github-light","dark":"github-dark-default"}}
  wscat -c wss://sepolia.arbitrum.validationcloud.io/v1/wss/<YOUR_API_KEY_HERE>
  ```
</CodeGroup>

## Compute Units

| Method | Compute units |
| - | - |
| [debug\_traceBlockByHash](/nodeapi/arbitrum/debug-api/debug_traceblockbyhash) | 80 |
| [debug\_traceBlockByNumber](/nodeapi/arbitrum/debug-api/debug_traceblockbynumber) | 80 |
| [debug\_traceCall](/nodeapi/arbitrum/debug-api/debug_tracecall) | 80 |
| [debug\_traceTransaction](/nodeapi/arbitrum/debug-api/debug_tracetransaction) | 80 |
| [eth\_accounts](/nodeapi/arbitrum/execution-api/eth_accounts) | 20 |
| [eth\_blockNumber](/nodeapi/arbitrum/execution-api/eth_blocknumber) | 20 |
| [eth\_call](/nodeapi/arbitrum/execution-api/eth_call) | 40 |
| [eth\_chainId](/nodeapi/arbitrum/execution-api/eth_chainid) | 10 |
| [eth\_estimateGas](/nodeapi/arbitrum/execution-api/eth_estimategas) | 40 |
| [eth\_gasPrice](/nodeapi/arbitrum/execution-api/eth_gasprice) | 40 |
| [eth\_getBalance](/nodeapi/arbitrum/execution-api/eth_getbalance) | 40 |
| [eth\_getBlockByHash](/nodeapi/arbitrum/execution-api/eth_getblockbyhash) | 40 |
| [eth\_getBlockByNumber](/nodeapi/arbitrum/execution-api/eth_getblockbynumber) | 40 |
| [eth\_getBlockTransactionCountByHash](/nodeapi/arbitrum/execution-api/eth_getblocktransactioncountbyhash) | 40 |
| [eth\_getBlockTransactionCountByNumber](/nodeapi/arbitrum/execution-api/eth_getblocktransactioncountbynumber) | 40 |
| [eth\_getCode](/nodeapi/arbitrum/execution-api/eth_getcode) | 40 |
| [eth\_getFilterChanges](/nodeapi/arbitrum/execution-api/eth_getfilterchanges) | 40 |
| [eth\_getFilterLogs](/nodeapi/arbitrum/execution-api/eth_getfilterlogs) | 40 |
| [eth\_getLogs](/nodeapi/arbitrum/execution-api/eth_getlogs) | 80 |
| [eth\_getStorageAt](/nodeapi/arbitrum/execution-api/eth_getstorageat) | 40 |
| [eth\_getTransactionByBlockHashAndIndex](/nodeapi/arbitrum/execution-api/eth_gettransactionbyblockhashandindex) | 40 |
| [eth\_getTransactionByBlockNumberAndIndex](/nodeapi/arbitrum/execution-api/eth_gettransactionbyblocknumberandindex) | 40 |
| [eth\_getTransactionByHash](/nodeapi/arbitrum/execution-api/eth_gettransactionbyhash) | 40 |
| [eth\_getTransactionCount](/nodeapi/arbitrum/execution-api/eth_gettransactioncount) | 40 |
| [eth\_getTransactionReceipt](/nodeapi/arbitrum/execution-api/eth_gettransactionreceipt) | 40 |
| [eth\_getUncleByBlockHashAndIndex](/nodeapi/arbitrum/execution-api/eth_getunclebyblockhashandindex) | 40 |
| [eth\_getUncleByBlockNumberAndIndex](/nodeapi/arbitrum/execution-api/eth_getunclebyblocknumberandindex) | 40 |
| [eth\_getUncleCountByBlockHash](/nodeapi/arbitrum/execution-api/eth_getunclecountbyblockhash) | 40 |
| [eth\_getUncleCountByBlockNumber](/nodeapi/arbitrum/execution-api/eth_getunclecountbyblocknumber) | 40 |
| [eth\_maxPriorityFeePerGas](/nodeapi/arbitrum/execution-api/eth_maxpriorityfeepergas) | 20 |
| [eth\_newBlockFilter](/nodeapi/arbitrum/execution-api/eth_newblockfilter) | 40 |
| [eth\_newFilter](/nodeapi/arbitrum/execution-api/eth_newfilter) | 40 |
| [eth\_newPendingTransactionFilter](/nodeapi/arbitrum/execution-api/eth_newpendingtransactionfilter) | 40 |
| [eth\_sendRawTransaction](/nodeapi/arbitrum/execution-api/eth_sendrawtransaction) | 80 |
| [eth\_subscribe](/nodeapi/arbitrum/execution-api/eth_subscribe) | 20 |
| [eth\_syncing](/nodeapi/arbitrum/execution-api/eth_syncing) | 10 |
| [eth\_uninstallFilter](/nodeapi/arbitrum/execution-api/eth_uninstallfilter) | 20 |
| [eth\_unsubscribe](/nodeapi/arbitrum/execution-api/eth_unsubscribe) | 20 |
| [net\_listening](/nodeapi/arbitrum/execution-api/net_listening) | 10 |
| [net\_peerCount](/nodeapi/arbitrum/execution-api/net_peercount) | 20 |
| [net\_version](/nodeapi/arbitrum/execution-api/net_version) | 10 |
| [web3\_clientVersion](/nodeapi/arbitrum/execution-api/web3_clientversion) | 40 |
| [web3\_sha3](/nodeapi/arbitrum/execution-api/web3_sha3) | 40 |


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