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How to Write and Deploy an ERC-20 Contract on WEMIX3.0

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Deploying an ERC-20 contract on the WEMIX3.0 Testnet is straightforward using Remix, a powerful Ethereum development environment. Follow this step-by-step guide to create, compile, and deploy your token contract.

Key Considerations Before Deployment

  • Immutable Contracts: Once deployed, contracts cannot be modified or deleted. Verify all code and parameters before proceeding.
  • Testnet Focus: This guide uses the WEMIX3.0 Testnet for safe experimentation.

Step 1: Access Remix and Create a File

  1. Navigate to Remix Ethereum IDE.
  2. In the contracts folder, delete default files like Storage.sol or Ballot.sol.
  3. Create a new file named WEMIX_ERC20.sol.

👉 Need help setting up MetaMask for WEMIX3.0?

Step 2: Write the ERC-20 Contract

Paste the following code into your file. This example uses OpenZeppelin’s ERC-20 template with customizable token names and symbols:

“`solidity
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
import “https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol”;

contract MyToken is ERC20 {
constructor(string memory name, string memory symbol) ERC20(name, symbol) {
_mint(msg.sender, 99999999 * 10**uint(decimals()));
}
}
“`

Key Features:
– Mints 99,999,999 tokens to the deployer’s address.
– Supports standard ERC-20 functions (transfers, approvals).

Step 3: Compile the Contract

  1. Go to the Solidity Compiler tab in Remix.
  2. Select compiler version 0.8.19 (matching the pragma directive).
  3. Click Compile WEMIX_ERC20.sol.

Step 4: Deploy to WEMIX3.0 Testnet

  1. Switch to the Deploy & Run Transactions tab.
  2. Set ENVIRONMENT to Injected Provider - MetaMask (ensure MetaMask is connected to WEMIX3.0 Testnet).
  3. In CONTRACT, select MyToken.
  4. Enter your token’s name and symbol (e.g., “WTOKEN” and “WT”).

👉 Troubleshooting MetaMask connection issues

Step 5: Configure Gas Fees and Deploy

When you click Deploy, MetaMask will prompt:

Parameter Recommended Value (WEMIX3.0)
Max priority fee (GWEI) 100
Max fee (GWEI) 101 or higher
  1. Click Site suggested to auto-adjust fees.
  2. For manual control, select Advanced and input the values above.
  3. Confirm the transaction.

Success Indicator: A green checkmark in Remix confirms deployment.

FAQs

Can I modify my ERC-20 contract after deployment?

No. Smart contracts are immutable. Always test on a testnet first.

Why use WEMIX3.0 Testnet instead of Mainnet?

Testnets allow risk-free experimentation without real funds.

How do I verify my contract’s functionality?

Interact with it using Remix’s debug tools or Etherscan-like explorers for WEMIX.

What’s the purpose of the decimals() function?

It defines token divisibility (e.g., 18 decimals = 1 token = 10¹⁸ smallest units).

How can I distribute tokens to multiple addresses?

Call the transfer() function post-deployment or integrate a vesting contract.

Final Notes

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