Deploy Smart Contracts with Remix

Remix IDE is an open source web and desktop application that provides a fast development cycle with intuitive GUIs and a rich set of plugins. This guide will walk you through deploying an ERC-20 token contract on HeLa using Remix.

Prerequisites

Before you begin, ensure you have:

1. MetaMask installed and configured for HeLa network

2. HLUSD tokens in your wallet for gas fees

3. A test account (recommended to use a separate browser for testing)

Metamask setup hyperlink

Step 1: Open Remix IDE

1. Visithttps://remix.ethereum.org

Step 2: Create ERC-20 Token Contract

1. In the file explorer, create a new file under the contracts folder named MyToken.sol

2. Copy and paste the following ERC-20 token contract code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;

import "@openzeppelin/contracts/token/ERC20/ERC20.sol";

contract MyToken is ERC20 {
    constructor(uint256 initialSupply) ERC20("MyFirstHeLaToken", "HLT") {
       _mint(msg.sender, 5000 * 10 ** decimals());
    }
}

Customizing Your Token

You can customize your token by changing:

• "MyFirstHelaToken" - The token name

• "HLT" - The token symbol (appears in MetaMask, max 5 characters)

• 5000 - The initial token supply minted to your wallet </aside>

Step 3: Compile the Contract

1. Go to the Solidity Compiler tab in the left sidebar

2. Click Compile MyToken.sol

3. Ensure you see a green checkmark indicating successful compilation

Step 4: Deploy to HeLa

1. Navigate to the Deploy & Run Transactions tab

2. In the Environment dropdown, select Injected Provider - MetaMask

Network Detection

If Injected Provider cannot detect the network, refresh the Remix IDE page and switch between networks in MetaMask.

1. Select your MyToken contract from the dropdown

2. Click Deploy to deploy your ERC-20 token contract

3. Confirm the deployment transaction in MetaMask

Step 5: Get Contract Address

1. After successful deployment, copy the Contract Address from Remix

Step 6: Import Token to MetaMask

1. In MetaMask, go to Tokens tab and click Import Tokens

2. Paste the contract address from Remix into the Token Contract Address field

3. The token information should auto-populate (Token Symbol and Decimals)

4. Click Add Custom Token and then Import Tokens

Step 7: Verify Token Balance

1. Check your Tokens tab in MetaMask to see your newly minted tokens

2. You should see 5000 tokens (or your custom amount) in your wallet

Step 8: Transfer Tokens

1. Select your token in MetaMask and click Send

2. Enter the recipient address and amount

3. Click Next and confirm the transaction

4. Wait for the transaction to be confirmed

Step 9: Verify on Block Explorer

1. In MetaMask, click on the transaction and select View on block explorer

2. Verify that the ERC-20 token transfer is displayed correctly on the explorer

Testing Tips

• Test token transfers between different MetaMask accounts

• Verify all transactions appear correctly on the block explorer

• If you encounter issues, try resetting MetaMask via settings

Troubleshooting

If you encounter issues:

• Network not detected: Refresh Remix and switch networks in MetaMask

• Transaction fails: Ensure you have sufficient HLUSD for gas fees

• Token not appearing: Double-check the contract address when importing

• MetaMask issues: Reset MetaMask via settings if problems persist

Support :

If you encounter any issues during setup or require assistance, please join the HeLa Developer Community for direct support and guidance.