eth_chainId - Ethereum RPC Method
Get the chain ID for Ethereum. Essential for transaction signing and network verification.
Returns the chain ID used for transaction signing on Ethereum.
Why Ethereum? Build on the world's leading smart contract platform with the largest developer ecosystem with battle-tested security, institutional adoption, and unmatched ecosystem with $166B+ TVL.
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
trace_transaction
Get traces for a specific transaction on Ethereum. Requires archive node for DeFi protocols (60% market share), NFT marketplaces, DAOs, and enterprise dApps.
eth_syncing
Check the sync status of your Ethereum node. Returns sync progress or false when fully synced — essential for node health monitoring and dApp reliability.