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

# Arbitrum Onchain Data API

> Get token balances and transactions for Arbitrum. 24 endpoints supported. Testnet supported.

## Overview

<Tip>
  Arbitrum is Ethereum's leading L2 rollup, combining full EVM equivalence with dramatically lower fees. Trusted by major DeFi protocols for secure, scalable smart contract execution.
</Tip>

<Info>
  Note about how we calculate transaction fees on Arbitrum:

  Generally, the `fees_paid` in our transaction response is simply the product of `gas_price` and `gas_spent` .

  However for Arbitrum, the `fees_paid` in our transaction response is the sum of multiple L1 and L2 fees associated with the function call, transaction execution and storage.

  To calculate the same `fees_paid` provided in our transaction response from <a href="https://arbiscan.io/tx/0x24ba19119fa5c10ef1e92cc3f02519c5bc675fc4f3dfb4c9c2ca7744070b9e3c" target="_blank" rel="noopener noreferrer">Arbiscan</a> , take the product of their Gas Price Bid and Gas Usage.
</Info>

GoldRush offers the most comprehensive Arbitrum Data API suite for developers, analysts, and enterprises. Whether you're
building a DeFi dashboard, a wallet, a trading bot, an AI agent or a compliance platform,
our Arbitrum Data APIs provide fast, accurate, and developer-friendly access to the essential onchain data you need.

### Supported APIs

<Columns cols={2}>
  <Card title="Foundational API" icon="https://mintcdn.com/goldrush/HCWRKGncxpy71D8p/images/icons/foundational.svg?fit=max&auto=format&n=HCWRKGncxpy71D8p&q=85&s=8a0b97060449218c1b477fe1fffc8a92" href="/goldrush-foundational-api" cta="Read docs" width="24" height="24" data-path="images/icons/foundational.svg">
    Access structured historical blockchain data across 100+ chains using REST APIs.
    Get token balances, transaction histories, decoded event logs, NFT assets, token holders and more.<br /><br />
    <b>Use cases: Wallets, portfolio trackers, crypto accounting & tax tools, and DeFi dashboards.</b>
  </Card>

  <Card title="Pipeline API" icon="https://mintcdn.com/goldrush/HCWRKGncxpy71D8p/images/icons/pipeline.svg?fit=max&auto=format&n=HCWRKGncxpy71D8p&q=85&s=f0027120a50c03e5660514e94a26cabb" href="/goldrush-pipeline-api" cta="Read docs" width="24" height="24" data-path="images/icons/pipeline.svg">
    Stream blockchain data directly to your own infrastructure. Push decoded blocks, transactions, event logs, and protocol-specific data into your database, warehouse, queue, or webhook with ABI decoding and SQL transforms built in.<br /><br />
    <b>Use cases: Data warehousing, analytics dashboards, ETL pipelines, and backend indexing.</b>
  </Card>
</Columns>

## Mainnet

| Property             | Value                                    |
| -------------------- | ---------------------------------------- |
| **Chain Name**       | `arbitrum-mainnet`                       |
| **Chain ID**         | `42161`                                  |
| **Network Type**     | Frontier Chain                           |
| **Support Level**    | frontier                                 |
| **Block Explorer**   | [Arbiscan](https://arbiscan.io/)         |
| **Official Website** | [Arbitrum Website](https://arbitrum.io/) |
| **Native Gas Token** | ETH                                      |

## Testnet

| Property             | Value                                                                                                         |
| -------------------- | ------------------------------------------------------------------------------------------------------------- |
| **Chain Name**       | `arbitrum-sepolia`                                                                                            |
| **Chain ID**         | `421614`                                                                                                      |
| **Purpose**          | Development and testing network                                                                               |
| **Support Level**    | frontier                                                                                                      |
| **Block Explorer**   | [Sepolia Arbiscan](https://sepolia.arbiscan.io/)                                                              |
| **Official Website** | [Arbitrum Sepolia Testnet Website](https://docs.arbitrum.io/for-devs/concepts/public-chains#arbitrum-sepolia) |
| **Native Gas Token** | ETH                                                                                                           |

## API Usage

To use this blockchain network in GoldRush API calls, use:

#### Chain Name

* `arbitrum-mainnet` (mainnet)
* `arbitrum-sepolia` (testnet)

#### Example API Calls

<CodeGroup>
  ```bash Chain Name (Mainnet) theme={null}
  curl -X GET "https://api.covalenthq.com/v1/arbitrum-mainnet/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances_v2/?key=<GOLDRUSH_API_KEY>"
  ```

  ```bash Chain Name (Arbitrum Sepolia Testnet) theme={null}
  curl -X GET "https://api.covalenthq.com/v1/arbitrum-sepolia/address/0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045/balances_v2/?key=<GOLDRUSH_API_KEY>"
  ```

  ```bash theme={null}
  ```
</CodeGroup>

#### SDK Usage

<CodeGroup>
  ```typescript TypeScript SDK (Mainnet) theme={null}
  import { GoldRushClient } from "@covalenthq/client-sdk";

  const client = new GoldRushClient("<GOLDRUSH_API_KEY>");
  const resp = await client.BalanceService.getTokenBalancesForWalletAddress({
      chainName: "arbitrum-mainnet",
      walletAddress: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  });
  ```

  ```typescript TypeScript SDK (Arbitrum Sepolia Testnet) theme={null}
  import { GoldRushClient } from "@covalenthq/client-sdk";

  const client = new GoldRushClient("<GOLDRUSH_API_KEY>");
  const resp = await client.BalanceService.getTokenBalancesForWalletAddress({
      chainName: "arbitrum-sepolia",
      walletAddress: "0xd8dA6BF26964aF9D7eEd9e03E53415D37aA96045"
  });
  ```
</CodeGroup>

## Foundational API Support

This chain supports **24**  GoldRush Foundational APIs:

#### Wallet API

* **[Get token holders as of any block height (v2)](/api-reference/foundational-api/balances/get-token-holders-as-of-any-block-height-v2/)**
* **[Get token balances for address](/api-reference/foundational-api/balances/get-token-balances-for-address/)**
* **[Get native token balance for address](/api-reference/foundational-api/balances/get-native-token-balance/)**
* **[Get historical portfolio value over time](/api-reference/foundational-api/balances/get-historical-portfolio-value-over-time/)**
* **[Get ERC20 token transfers for address](/api-reference/foundational-api/balances/get-erc20-token-transfers-for-address/)**

#### NFT API

* **[Get NFTs for address](/api-reference/foundational-api/nft/get-nfts-for-address/)**

#### Pricing API

* **[Get historical token prices](/api-reference/foundational-api/utility/get-historical-token-prices/)**

#### Security API

* **[Get token approvals for address](/api-reference/foundational-api/security/get-token-approvals-for-address/)**

#### Transactions API

* **[Get a transaction](/api-reference/foundational-api/transactions/get-a-transaction/)** `with-traces`
* **[Get transaction summary for address](/api-reference/foundational-api/transactions/get-transaction-summary-for-address/)**
* **[Get earliest transactions for address (v3) ](/api-reference/foundational-api/transactions/get-earliest-transactions-for-address-v3/)** `with-traces`
* **[Get recent transactions for address (v3)](/api-reference/foundational-api/transactions/get-recent-transactions-for-address-v3/)** `with-traces`
* **[Get paginated transactions for address (v3)](/api-reference/foundational-api/transactions/get-paginated-transactions-for-address-v3/)** `with-traces`
* **[Get bulk time bucket transactions for address (v3)](/api-reference/foundational-api/transactions/get-time-bucket-transactions-for-address-v3/)**
* **[Get all transactions in a block (v3)](/api-reference/foundational-api/transactions/get-all-transactions-in-a-block/)**
* **[Get all transactions in a block by page (v3) ](/api-reference/foundational-api/transactions/get-all-transactions-in-a-block-by-page/)**

#### Block Explorer API

* **[Get a block](/api-reference/foundational-api/utility/get-a-block/)**
* **[Get all chain statuses](/api-reference/foundational-api/utility/get-all-chain-statuses/)**
* **[Get all chains](/api-reference/foundational-api/utility/get-all-chains/)**
* **[Get block heights](/api-reference/foundational-api/utility/get-block-heights/)**
* **[Get gas prices](/api-reference/foundational-api/utility/get-gas-prices/)**
* **[Get log events by contract address](/api-reference/foundational-api/utility/get-log-events-by-contract-address/)**
* **[Get log events by topic hash(es)](/api-reference/foundational-api/utility/get-log-events-by-topic-hash/)**
* **[Get logs](/api-reference/foundational-api/utility/get-logs/)**

## Pipeline API Support

This chain supports **4** GoldRush Pipeline API data objects that can be streamed to your infrastructure:

* [Blocks](/goldrush-pipeline-api/supported-chains#arbitrum-evm)
* [Transactions](/goldrush-pipeline-api/supported-chains#arbitrum-evm)
* [Logs](/goldrush-pipeline-api/supported-chains#arbitrum-evm)
* [Transfers](/goldrush-pipeline-api/supported-chains#arbitrum-evm)

## Additional Resources

* [GoldRush API Documentation](https://goldrush.dev/docs/)
* [Supported Chains List](https://goldrush.dev/chains/)
* [API Reference](https://goldrush.dev/docs/api-reference/)