curl --request POST \
--url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
--header 'Content-Type: application/json' \
--data '{
"jsonrpc": "2.0",
"method": "eth_chainId",
"id": 1
}'
{
"jsonrpc": "<string>",
"id": 123,
"result": "<string>"
}
curl --request POST \
--url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
--header 'Content-Type: application/json' \
--data '{
"jsonrpc": "2.0",
"method": "eth_chainId",
"id": 1
}'
{
"jsonrpc": "<string>",
"id": 123,
"result": "<string>"
}
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.
none
— This method does not require any parameters.result
— the current chain ID, encoded as a hexadecimal string. For example, the chain ID for Optimism Mainnet is 0xa
.eth_chainId
method is essential for:
The current chain ID
The response is of type object
.
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