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Quickstart with Hardhat

Configure Hardhat for Zroarus Testnet and deploy a contract.

TestnetVerified Sep 27, 2026
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Set up#

Create a Hardhat project following the official guide(opens in a new tab) (TypeScript template with the toolbox), then fund a test-only wallet from the faucet(opens in a new tab).

Configure#

Add the Testnet as a network and set evmVersion: "cancun". The key is read from the environment, with no fallback.

hardhat.config.ts
import type { HardhatUserConfig } from "hardhat/config";
import "@nomicfoundation/hardhat-toolbox";

const key = process.env.ZROARUS_TESTNET_KEY; // set in your shell, never committed

const config: HardhatUserConfig = {
  solidity: {
    version: "0.8.28",
    settings: { evmVersion: "cancun", optimizer: { enabled: true, runs: 200 } },
  },
  networks: {
    zroarusTestnet: {
      url: "https://rpc.testnet.zroarus.com",
      chainId: 305583,
      accounts: key ? [key] : [],
    },
  },
};

export default config;

Deploy#

scripts/deploy.ts
import { ethers } from "hardhat";

async function main() {
  const counter = await ethers.deployContract("Counter");
  await counter.waitForDeployment();
  console.log("Counter deployed to", await counter.getAddress());
}

main().catch((err) => { console.error(err); process.exitCode = 1; });
Terminal
read -rs ZROARUS_TESTNET_KEY && export ZROARUS_TESTNET_KEY
npx hardhat run scripts/deploy.ts --network zroarusTestnet
unset ZROARUS_TESTNET_KEY

Look the address up on the explorer(opens in a new tab). To publish the source, see Contract verification.

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