Smart Contract Deployment to Base

Deploying Smart Contracts to Base

Base is an L2 from Coinbase on OP Stack. Fully EVM-compatible: same Solidity, same ABI, same tools. Deploying a contract from Ethereum to Base — this is changing the --network flag and RPC URL. But there are nuances with verification, gas estimation and bridge for testing.

Hardhat Configuration

// hardhat.config.ts
import { HardhatUserConfig } from 'hardhat/config'
import '@nomicfoundation/hardhat-toolbox'
import '@nomicfoundation/hardhat-verify'

const config: HardhatUserConfig = {
  solidity: {
    version: '0.8.24',
    settings: { optimizer: { enabled: true, runs: 200 } }
  },
  networks: {
    base: {
      url: 'https://mainnet.base.org',
      accounts: [process.env.DEPLOYER_PRIVATE_KEY!],
      chainId: 8453,
    },
    'base-sepolia': {
      url: 'https://sepolia.base.org',
      accounts: [process.env.DEPLOYER_PRIVATE_KEY!],
      chainId: 84532,
    },
  },
  etherscan: {
    apiKey: {
      base: process.env.BASESCAN_API_KEY!,
      'base-sepolia': process.env.BASESCAN_API_KEY!,
    },
    customChains: [
      {
        network: 'base',
        chainId: 8453,
        urls: {
          apiURL: 'https://api.basescan.org/api',
          browserURL: 'https://basescan.org',
        },
      },
      {
        network: 'base-sepolia',
        chainId: 84532,
        urls: {
          apiURL: 'https://api-sepolia.basescan.org/api',
          browserURL: 'https://sepolia.basescan.org',
        },
      },
    ],
  },
}
export default config

Deployment and Verification

# Deploy to Base Sepolia (testnet)
npx hardhat run scripts/deploy.ts --network base-sepolia

# Verify source code
npx hardhat verify --network base-sepolia <CONTRACT_ADDRESS> <constructor_arg1> <constructor_arg2>

For contracts with constructor arguments in ABI-encoded format — use arguments file:

npx hardhat verify --network base --constructor-args scripts/args.ts <CONTRACT_ADDRESS>

Foundry Variant

forge create --rpc-url https://mainnet.base.org \
  --private-key $DEPLOYER_PRIVATE_KEY \
  --etherscan-api-key $BASESCAN_API_KEY \
  --verify \
  src/MyContract.sol:MyContract \
  --constructor-args <arg1> <arg2>

--verify verifies immediately after deployment. Foundry is faster than Hardhat for simple deployments.

Gas on Base

Base gas is paid in ETH. Gas price usually 0.001-0.01 gwei — orders of magnitude cheaper than mainnet. Typical costs:

For test ETH on Base Sepolia — Coinbase faucet (coinbase.com/faucets) or bridge from Ethereum Sepolia via Base bridge.

Deterministic Deployment with CREATE2

If you need same contract address on Base and other networks — CREATE2 via deterministic deployer:

// Use standard Nick's factory (0x4e59b44847b379578588920cA78FbF26c0B4956C)
bytes32 salt = keccak256("my-project-v1");

cast create2 --starts-with 0x1234 --init-code-hash <hash>
# Will find salt for vanity address starting with 0x1234

Contract address on Base, Optimism, Arbitrum and Ethereum will be identical with same bytecode and salt.