deploy

Deploy smart contracts locally or to MegaETH testnet and mainnet

mega deploy

The deploy command (also aliased as mega create) deploys a smart contract with Foundry’s forge create.

Usage

mega deploy <contract> [options]

Arguments

Argument	Description
contract	Path to the contract file and contract name, such as src/MyContract.sol:MyContract

Network options

Option	Description
--network <network>	Select local, testnet, or mainnet. Defaults to local
-r, --rpc-url <url>	Override the selected network’s default RPC URL

Network	Chain ID	Default RPC
local	31337	http://127.0.0.1:8545
testnet	6343	https://carrot.megaeth.com/rpc
mainnet	4326	https://mainnet.megaeth.com/rpc

When --rpc-url is supplied, Mega CLI checks the endpoint’s chain ID against the selected --network before deployment. This prevents accidental deployment to the wrong chain.

Common options

Option	Description
--broadcast	Broadcast the transaction instead of doing a dry run
--constructor-args [args...]	Pass constructor arguments
--verify	Verify the contract after creation
--account <name>	Use a keystore account from Foundry’s default keystore folder
--private-key <key>	Use the provided private key
--gas-limit <limit>	Set the transaction gas limit
--value <value>	Send ETH with the deployment
--optimize	Enable the Solidity optimizer

Mega CLI passes supported deployment options to forge create. See the Forge documentation for the underlying command.

Examples

Deploy locally

The network defaults to local. If no wallet option is provided locally, Mega CLI uses Anvil’s first development account.

mega deploy src/MyContract.sol:MyContract --broadcast

The explicit equivalent is:

mega deploy src/MyContract.sol:MyContract --network local --broadcast

Deploy to MegaETH testnet

mega deploy src/MyContract.sol:MyContract \
  --network testnet \
  --broadcast \
  --account <account-name>

Deploy to MegaETH mainnet

mega deploy src/MyContract.sol:MyContract \
  --network mainnet \
  --broadcast \
  --account <account-name>

Use a custom RPC

mega deploy src/MyContract.sol:MyContract \
  --network testnet \
  --rpc-url https://your-testnet-rpc.example \
  --broadcast \
  --account <account-name>

A custom RPC overrides only the endpoint. --network still determines the expected chain ID.

Deploy with constructor arguments

mega deploy src/MyContract.sol:MyContract \
  --broadcast \
  --constructor-args "Hello World" 123

Related

• compile - Compile contracts before deployment
• verify - Verify a testnet or mainnet deployment
• account - Manage deployment accounts
• balance - Check balance before deployment