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

# Chain info | Arbitrum

> Arbitrum chain data RPC methods for querying network details like chain ID, syncing status, and protocol version through Chainstack node endpoints.

For example, if a developer wants to build a DApp on Arbitrum, they would use these methods to get information about the network they are connecting to. They could use the chain ID information to make sure they are connecting to the right network and to ensure the security of their DApp; for example, distinguishing between the main network and a test network.

Retrieving chain information from the Arbitrum blockchain can be done by using the following methods:

<CardGroup>
  <Card title="eth_chainId" href="/reference/chainid" icon="angle-right" iconType="solid" horizontal />

  <Card title="eth_syncing" href="/reference/arbitrum-syncing" icon="angle-right" iconType="solid" horizontal />
</CardGroup>

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