eth_chainId - Unichain RPC Method
Get the chain ID for Unichain. Essential for transaction signing and network verification.
Returns the chain ID used for transaction signing on Unichain.
Why Unichain? Build on Uniswap's DeFi-optimized Superchain L2 with 250ms sub-blocks and 95% lower costs than Ethereum with 250ms sub-blocks (fastest L2), TEE-secured block building, native Superchain interoperability, and 65% revenue to validators.
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 Unichain. Requires archive node for debugging decentralized exchanges, liquidity protocols, and MEV-protected DeFi applications.
eth_syncing
Check the sync status of your Unichain node. Returns sync progress or false when fully synced — essential for node health monitoring and dApp reliability.