EXAMPLES

When you are connected to a local node:
cast chain-id
31337
When providing a RPC endpoint URL:
cast chain-id --rpc-url https://rpc.sepolia.org/
11155111
Works with -r too:
cast chain-id -r https://polygon-rpc.com
137

DOCUMENTATION

import RpcUrlOption from "../../reference/common/rpc-url-optionx"; import CommonOptions from "./common-optionsx";

cast chain-id

NAME

cast-chain-id - Get the Ethereum chain ID.

SYNOPSIS

cast chain-id [options]

DESCRIPTION

Get the Ethereum chain ID from the RPC endpoint we are connected to.

OPTIONS

RPC Options

<RpcUrlOption /> <CommonOptions />

EXAMPLES

  1. Get the chain ID when talking to $RPC:

    cast chain-id --rpc-url $RPC

  2. Get the chain ID when $ETH_RPC_URL is set:

    cast chain-id

SEE ALSO

cast, cast chain