Deploy and Verify Contracts

You can deploy contracts to Mezo matsnet targeting the London EVM Version and the network details on the Connect to Mezo matsnet page. The examples are tested using Hardhat, Foundry, and Remix, but you can try using other frameworks if you prefer.

Before you begin

Before you can deploy contracts, you will need an Ethereum wallet with matsnet BTC to pay for the gas fees.

• Stack matsnet BTC

• Connect to Mezo matsnet

Hardhat

If you are new to Hardhat, use the Hardhat Quick Start guide to learn how to install and initialize your project.

To configure Hardhat to work with Mezo matsnet, set the following items in your Hardhat config file:

• Add an entry under networks for Mezo matsnet with url: "https://rpc.test.mezo.org" and chainId: 31611.

• In the solidity settings, add evmVersion: "london".

As an example, see these basic Hardhat config files:

hardhat.config.ts (TypeScript)

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

const config: HardhatUserConfig = {
  defaultNetwork: "matsnet",
  networks: {
    hardhat: {
    },
    matsnet: {
      url: "https://rpc.test.mezo.org",
      chainId: 31611,
      accounts: ["YOUR_PRIVATE_WALLET_KEY"]
    }
  },
  solidity: {
    version: "0.8.28",
    settings: {
      evmVersion: "london",
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  },
};

export default config;

hardhat.config.js (JavaScript)

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

module.exports = {
  defaultNetwork: "matsnet",
  networks: {
    hardhat: {
    },
    matsnet: {
      url: "https://rpc.test.mezo.org",
      chainId: 31611,
      accounts: ["YOUR_PRIVATE_WALLET_KEY"]
    }
  },
  solidity: {
    version: "0.8.28",
    settings: {
      evmVersion: "london",
      optimizer: {
        enabled: true,
        runs: 200
      }
    }
  },
};

After your Hardhat project is configured, deploy the contact using Hardhat ignition or a deploy script. For example, use npx hardhat run to call a deploy script and specify matsnet as your target network.

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

Foundry

If you are new to Foundry, use the Foundry Getting Started guide to learn how to install and initialize your project.

To configure a Foundry project to work with Mezo matsnet, set the following items in your Foundry TOML file under [profile.default] or a preferred profile:

• Chain ID: chain_id = 31661

• RPC: eth_rpc_url = "https://rpc.test.mezo.org"

• EVM Version: evm_version = 'london'

As an example, see the example Foundry TOML:

[profile.default]
src = "src"
out = "out"
libs = ["lib"]
chain_id = 31661
eth_rpc_url = "https://rpc.test.mezo.org"
evm_version = 'london'

After the TOML is configured, deploy your contracts using forge create:

forge create src/Counter.sol:Counter --private-key YOUR_PRIVATE_WALLET_KEY

Remix

Remix is a browser development environment. If you are new to Remix, see the Basics of Remix embedded guide to learn how to compile and deploy a contract.

Remix requires some extra configuration to work with Mezo matsnet:

• Connect your browser wallet to Mezo matsnet so Remix can use it as an Injected Provider.

• In Remix under the Solidity Compiler tab, open the Advanced Configurations menu and select london as the EVM version.

• In Remix under the Deploy & Run Transactions tab, set the Environment to use an Injected Provider. Set the current network on your browser wallet to Mezo matsnet. Remix should detect the custom network with chain ID 31611.

After you complete these settings, you can deploy contracts to Mezo matsnet using the standard process. See the Remix Documentation for more information about how to use Remix.

Verifying contracts

Currently, the explorer does not issue API keys to verify contracts using development frameworks. Use the contract verification UI at https://explorer.test.mezo.org/contract-verification.