POST
/
2fc1de7f08c0465f6a28e3c355e0cb14
curl --request POST \
  --url https://base-mainnet.core.chainstack.com/2fc1de7f08c0465f6a28e3c355e0cb14 \
  --header 'Content-Type: application/json' \
  --data '{
  "jsonrpc": "2.0",
  "method": "eth_chainId",
  "id": 1
}'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

Base API method eth_chainId retrieves the current chain ID, which is a unique identifier for the blockchain network the node is connected to. The chain ID is crucial for transaction signing to prevent replay attacks across different chains.

Get you own node endpoint today

Start for free and get your app to production levels immediately. No credit card required.

You can sign up with your GitHub, X, Google, or Microsoft account.

​
Parameters

  • none — This method does not require any parameters.

​
Response

  • result — the current chain ID, encoded as a hexadecimal string.

​
Use case

The eth_chainId method is essential for:

  • Wallets and applications that sign transactions, as the chain ID is used as part of the signing process to ensure transactions are only valid on the intended chain.
  • Applications that interact with multiple blockchain networks and need to confirm the network they are communicating with.

Body

application/json

Response

200 - application/json

The current chain ID

The response is of type object.