eth_chainId - Polygon RPC Method
Get the chain ID for Polygon. Essential for transaction signing and network verification.
Returns the chain ID used for transaction signing on Polygon.
Why Polygon? Build on the most adopted Ethereum scaling solution with 45,000+ dApps and enterprise partnerships with $4B+ TVL, sub-$0.01 transactions, 8M+ daily transactions, and zkEVM for enhanced security.
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 Polygon. Requires archive node for debugging enterprise solutions (Starbucks, Disney, Reddit), gaming, DeFi, and stablecoin payments.
eth_syncing
Check the sync status of your Polygon node. Returns sync progress or false when fully synced — essential for node health monitoring and dApp reliability.