Documentation Index
Fetch the complete documentation index at: https://docs.skale.space/llms.txt
Use this file to discover all available pages before exploring further.
Deploy an ERC-20 Token
OpenZeppelin provides secure, community-vetted smart contract templates that follow best practices.
Deployment with Foundry
Deployment with Hardhat
Step 0: Setup Foundry
If your foundry project isn’t setup yet please go to foundry setup section before proceeding.Step 1: Create the ERC-20 Contract
Create a contract script in src/MyERC20.sol. Run:Add the code:// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract MyERC20 is ERC20 {
constructor() ERC20("MyToken", "MTK") {
// Mint 1 million tokens to the deployer (18 decimals)
_mint(msg.sender, 1000000 * 10 ** decimals());
}
}
- Inherits from OpenZeppelin’s
ERC20 contract
- Sets the token name to “MyToken” and symbol to “MTK”
- Mints 1,000,000 tokens to the deployer address upon deployment
Step 2: Compile the Contract
Compile your contract:Step 3: Prepare Signer for Deployment
This tutorial uses the Foundry Keystore for increased security. Create a new keystore:cast wallet import skale-deployer --private-key $(cast wallet new | grep 'Private key:' | awk '{print $3}')
Provide a password to encrypt the keystore file when running the above command. If you forget this password, you will not be able to recover it.
cast wallet address --account skale-deployer
Make sure you toggle testnet on first if you’re using a testnet chain!
Step 4: Deploy the Contract
Deploy your ERC-20 token to SKALE:forge create src/MyERC20.sol:MyERC20 \
--account skale-deployer \
--rpc-url skale_testnet \
--broadcast \
--legacy
The --legacy flag is required for SKALE Chains. For more information, see Troubleshooting. Enter keystore password:
Deployer: 0x63a38D694de837dDF765f9b2704814275586D812
Deployed to: 0x4A435f6E471f773173774E860EBDcd17B132a2b4
Transaction hash: 0x3f6cc66e860cb82a6a62e3f5181c401e5558d60d622a9157437002e16c1ce488
Step 5: Verify Your Smart Contract
Verify your smart contract on the block explorer:forge verify-contract \
--rpc-url skale_testnet \
<DEPLOYED_ADDRESS> \
src/MyERC20.sol:MyERC20 \
--verifier blockscout \
--verifier-url https://base-sepolia-testnet-explorer.skalenodes.com/api
<DEPLOYED_ADDRESS> with your deployed contract address.Step 0: Setup Hardhat
If your hardhat project isn’t setup yet please go to hardhat setup section before proceeding.Step 1: Create the ERC-20 Contract
Create a contract script in contracts/MyERC20.sol. Run:touch contracts/MyERC20.sol
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.19;
import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
contract MyERC20 is ERC20 {
constructor() ERC20("MyToken", "MTK") {
// Mint 1 million tokens to the deployer (18 decimals)
_mint(msg.sender, 1000000 * 10 ** decimals());
}
}
- Inherits from OpenZeppelin’s
ERC20 contract
- Sets the token name to “MyToken” and symbol to “MTK”
- Mints 1,000,000 tokens to the deployer address upon deployment
Step 2: Compile Contracts
Compile your contracts:Step 3: Create a Deployment Script
Create a deployment script in scripts/deploy_erc20.js. Run:touch scripts/deploy_erc20.js
const hre = require("hardhat");
async function main() {
const MyContract = await hre.ethers.getContractFactory("MyERC20");
const myContract = await MyContract.deploy();
await myContract.waitForDeployment();
console.log("Contract deployed to:", await myContract.getAddress());
}
main()
.then(() => process.exit(0))
.catch((error) => {
console.error(error);
process.exit(1);
});
Step 4: Run Tests
Run your tests:Step 5: Deploy to SKALE
Deploy your contract to SKALE:npx hardhat run scripts/deploy_erc20.js --network skale_testnet
SKALE-Specific Considerations
When deploying to SKALE with Hardhat:
-
Transaction Type: Hardhat automatically handles transaction types, but ensure your Hardhat version supports legacy transactions if needed
-
Gas Configuration: SKALE has zero gas fees, but you still need sFUEL for transactions:
networks: {
skale_testnet: {
url: "...",
accounts: [...],
gasPrice: 0, // SKALE has zero gas fees
},
},
- Contract Verification: Verify contracts using Hardhat’s verify plugin:
npx hardhat verify --network skale_testnet <CONTRACT_ADDRESS> <CONSTRUCTOR_ARGS>
