Deploy Your First Contract with Hardhat

mkdir stablenet-hardhat && cd stablenet-hardhat
npm init -y
npm install --save-dev hardhat @nomicfoundation/hardhat-toolbox

npx hardhat init

stablenet-hardhat/
├── contracts/        # Solidity source files
├── scripts/          # Deployment scripts
├── test/             # Test files
└── hardhat.config.js # Hardhat configuration

npm install dotenv

echo "PRIVATE_KEY=0xYourPrivateKey" > .env
echo ".env" >> .gitignore

require("@nomicfoundation/hardhat-toolbox");
require("dotenv").config();

module.exports = {
  solidity: {
    version: "0.8.20",
    settings: {
      // Blob opcodes are not supported on StableNet — do not use cancun
      evmVersion: "shanghai",
    },
  },
  networks: {
    stablenet_testnet: {
      url: "https://api.test.stablenet.network",
      chainId: 8283,
      accounts: [process.env.PRIVATE_KEY],
    },
  },
};

rm contracts/Lock.sol

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.20;

interface IERC20 {
    function transferFrom(address from, address to, uint256 amount) external returns (bool);
    function allowance(address owner, address spender) external view returns (uint256);
}

/// @title WKRCPayment
/// @notice Accepts WKRC payments from an approved sender.
///         The sender must approve this contract before calling pay().
contract WKRCPayment {
    /// @dev NativeCoinAdapter (WKRC) — fixed system contract address on StableNet.
    IERC20 public constant WKRC =
        IERC20(0x0000000000000000000000000000000000001000);

    event Payment(address indexed from, address indexed to, uint256 amount);

    /// @notice Pull `amount` of WKRC from msg.sender and forward it to `to`.
    ///         Requires prior WKRC.approve(address(this), amount).
    function pay(address to, uint256 amount) external {
        require(WKRC.transferFrom(msg.sender, to, amount), "WKRC transfer failed");
        emit Payment(msg.sender, to, amount);
    }

    /// @notice Check how much WKRC `owner` has approved for this contract.
    function allowanceOf(address owner) external view returns (uint256) {
        return WKRC.allowance(owner, address(this));
    }
}

npx hardhat compile

Compiled 1 Solidity file successfully (evm target: shanghai).

rm scripts/deploy.js 2>/dev/null; true

const { ethers } = require("hardhat");

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

  const WKRCPayment = await ethers.getContractFactory("WKRCPayment");

  // StableNet requires maxPriorityFeePerGas >= 27,600 Gwei on every transaction
  const contract = await WKRCPayment.deploy({
    maxPriorityFeePerGas: ethers.parseUnits("27600", "gwei"),
  });

  await contract.waitForDeployment();
  console.log("WKRCPayment deployed to:", await contract.getAddress());
}

main().catch((error) => {
  console.error(error);
  process.exitCode = 1;
});

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

Deploying with: 0xYourWalletAddress
WKRCPayment deployed to: 0xABC...