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Create an ERC-20 Token

In this guide, we'll demonstrate how to create a custom ERC-20 token on the eSync Network using the Hardhat development environment. Hardhat is a popular development tool for building smart contracts on the Ethereum network.

We'll use the OpenZeppelin contracts, which are a suite of reusable, secure smart contracts. These contracts have been thoroughly tested and audited by the community, which provides developers with a solid foundation to build upon, while reducing potential security risks associated with building smart contracts from scratch. We'll then deploy the contract on the eSync Network Testnet and the eSync Network Mainnet.

Prerequisites​

  1. Node.js (version 12.x or higher): Install it from here
  2. A code editor like Visual Studio Code: Install it from here

Step 1: Set up the development environment​

First, create a new directory for your project and navigate into it using the command line:

mkdir my-erc20-token
cd my-erc20-token

Initialize a new Node.js project:

npm init -y

Install Hardhat and its dependencies:

npm install --save-dev hardhat @nomiclabs/hardhat-waffle ethereum-waffle chai @nomiclabs/hardhat-ethers ethers

Create a Hardhat configuration file:

npx hardhat

Select "Create an empty hardhat.config.js" when prompted.

Open the hardhat.config.js file in your code editor and replace its contents with the following code:

require("@nomiclabs/hardhat-waffle");

module.exports = {
  solidity: "0.8.19",
  networks: {
    ecredits: {
      url: "https://rpc.esync.network",
      accounts: ["your_private_key_here"],
      gasPrice: 20000000000, // 20 Gwei
    },
    ecredits_test: {
      url: "https://rpc.tst.esync.network",
      accounts: ["your_private_key_here"],
      gasPrice: 20000000000, // 20 Gwei
    },
  },
};

Replace "your_private_key_here" with your private key that you use for deployment.

Install the openzeppelin/contracts package:

npm install @openzeppelin/contracts

Step 2: Create the ERC-20 token contract​

In your project directory, create a new directory called contracts and a new file inside it called MyToken.sol:

mkdir contracts
touch contracts/MyToken.sol

Paste the following Solidity code into MyToken.sol:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;

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

contract MyToken is ERC20 {
    constructor(uint256 initialSupply) ERC20("MyToken", "MTK") {
        _mint(msg.sender, initialSupply * 10**18);
    }
}
info

Note: You can use the OpenZeppelin Contracts Wizard to extend your ERC-20 Token with additional functionality.

Step 3: Compile the smart contract​

Compile the contract using Hardhat:

npx hardhat compile

Step 4: Deploy the ERC-20 token to the eSync testnet​

Create a new directory called scripts and a new file inside it called deploy.js:

mkdir scripts
touch scripts/deploy.js

Paste the following JavaScript code into deploy.js:

async function main() {
  const [deployer] = await ethers.getSigners();
  console.log("Deploying contracts with the account:", deployer.address);

  const MyToken = await ethers.getContractFactory("MyToken");
  const token = await MyToken.deploy(1000000); // Deploy with an initial supply of 1,000,000 tokens

  console.log("Token deployed to:", token.address);
}

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });

Now, make sure that your account specified in hardhat.config.js has some ECS to pay the gas fees for the deployment and deploy the contract to the eSync testnet:

npx hardhat run --network ecredits_test scripts/deploy.js

If the deployment is successful, the console will display a message with the contract address. Save this address as you will need it to interact with your ERC-20 token.
Once the deployment is done, you will see a "Token Minting" transaction at the eSync Testnet Block Explorer.

Step 5: Interact with your ERC-20 token​

You can interact with your token by using Hardhat's console:

npx hardhat console --network ecredits_test

Then, you can instantiate your token contract:

const token = await ethers.getContractAt(
  "MyToken",
  "the_token_contract_address"
);

Replace "the_token_contract_address" with the address of your deployed token contract.

Now, you can call the contract's methods. For instance, to check the total supply:

const totalSupply = await token.totalSupply();
console.log("Total supply is: ", totalSupply.toString());

To check the balance of an account:

const balance = await token.balanceOf("the_account_address");
console.log("Balance is: ", balance.toString());

Replace "the_account_address" with the address you want to check.

Remember to exit the console once you're done:

.exit

Step 6: Deploy the token to the eCredits Mainnet​

Repeat Step 4, but use --network eCredits instead of --network eCredits_test.
Make sure that your account has some eCredits for the deployment.

Conclusion​

Congratulations! You have just created your own ERC-20 token on the eCredits network using Hardhat. With your token now deployed, you can start building decentralized applications (dApps) around it or even distribute it to other users.

Remember to test your contract extensively and possibly get a security audit before using it in a production environment.