eth_chainId - Arbitrum RPC Method
Get the chain ID for Arbitrum. Essential for transaction signing and network verification.
Returns the chain ID used for transaction signing on Arbitrum.
Why Arbitrum? Build on Ethereum's leading Layer 2 with 46% L2 market share and $12B+ TVL with full EVM compatibility, 1.5M daily transactions, and $3B+ DAO treasury for ecosystem growth.
Use Cases
The eth_chainId method is essential for:
- Transaction signing - Ensure transactions are signed for the correct network
- Network verification - Confirm connection to the expected chain
- Multi-chain apps - Handle different networks programmatically
- Wallet integration - Validate network before transactions
Code Examples
Related Methods
net_version- Get network versioneth_syncing- Check sync status
debug_traceTransaction
Trace a transaction execution on Arbitrum. Requires archive node for debugging high-volume DeFi (GMX, Uniswap, Aave), gaming, and cross-chain applications.
eth_syncing
Check the sync status of your Arbitrum node. Returns sync progress or false when fully synced — essential for node health monitoring and dApp reliability.