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Deploy with Foundry

This tutorial walks through deploying a contract describing an ERC-20 token to Neon Devnet.

Introduction​

This tutorial is based on an example in GitHub.

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This page is a quickstart based on a specific example program. For more details on installing Foundry, refer to the Foundry documentation.

Prerequisites​

Step 1: Installation​

1.1 Clone the example Foundry project from the remote repository and navigate to it:

git clone https://github.com/neonlabsorg/neon-tutorials
cd neon-tutorials/foundry

1.2 Install Foundryup with:

curl -L https://foundry.paradigm.xyz | bash
foundryup
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foundryup installs the latest (nightly) precompiled binaries: forge, cast, anvil, and chisel.

1.3 Install the required libraries:

forge install foundry-rs/forge-std --no-commit
forge install openzeppelin/openzeppelin-contracts --no-commit

Step 2: Set up an environment file​

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This step requires an EVM-compatible wallet such as MetaMask, connected to Neon Devnet, with a balance in Devnet NEON available from NeonFaucet.

The following tutorials assist you to meet these prerequisites:

2.1 Obtain the private key for your wallet account.

To obtain the private key from MetaMask, from the hamburger menu, click Account Details > Show Private Key, enter your password, and click Confirm for access to the private key for that account.

2.2 Create a .env file and add these lines:

RPC_URL_DEVNET=https://devnet.neonevm.org
CHAIN_ID_DEVNET=245022926
RPC_URL_MAINNET=https://neon-proxy-mainnet.solana.p2p.org
CHAIN_ID_MAINNET=245022934
PRIVATE_KEY=<YOUR_PRIVATE_KEY>
VERIFIER_URL_BLOCKSCOUT=https://neon-devnet.blockscout.com/api
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Replace <YOUR_PRIVATE_KEY> with your data.

2.3 Run:

source .env

Step 3: Compile contracts​

The contracts are located in the project's src/ directory. Before these contracts can be run, they must first be compiled.

3.1 To compile the project's contracts, run the following command:

forge build

After running this step, you should see output similar to the following:

[⠢] Compiling...
[⠒] Compiling 24 files with 0.8.21
[⠃] Solc 0.8.21 finished in 2.48s
Compiler run successful!

3.2 (Optional) test the smart contracts with:

forge test

Step 4: Deploy Contracts​

  1. To deploy the project's contracts, run:
forge create --rpc-url $RPC_URL_DEVNET --private-key $PRIVATE_KEY src/TestERC20/TestERC20.sol:TestERC20 --constructor-args "Test ERC20 Token" "TERC20" --legacy

On running this step you should get console output similar to:

[⠰] Compiling...
No files changed, compilation skipped
Deployer: 0x4455E84Eaa56a01676365D4f86348B311969a4f4
Deployed to: 0x5537599aa2F97Dd60a66342522a465A7f2e40Ff9
Transaction hash: 0x6de9dab8a526cbac33008056d185b93dff725605efb791bf116b6bece4f0c486

Step 5: Contract verification​

5.1 Verify the deployment of our smart contract on the explorer Neon Blockscout using following command:

forge verify-contract --chain-id $CHAIN_ID_DEVNET <contract_address> src/TestERC20/TestERC20.sol:TestERC20 --verifier-url $VERIFIER_URL_BLOCKSCOUT --verifier blockscout
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Replace <contract_address> with your smart contract address.

After successfully running this step you should get console output similar to:

Start verifying contract `0x5537599aa2F97Dd60a66342522a465A7f2e40Ff9` deployed on 245022926
Submitting verification for [src/TestERC20/TestERC20.sol:TestERC20] "0x5537599aa2F97Dd60a66342522a465A7f2e40Ff9".
Submitted contract for verification:
    Response: `OK`
    GUID: `5537599aa2f97dd60a66342522a465a7f2e40ff9654118b3`
    URL:
        https://neon-devnet.blockscout.com/api?/address/0x5537599aa2f97dd60a66342522a465a7f2e40ff9

5.2 Copy/paste this link in your browser, remembering to replace contract_address with your freshly deployed contract address:

https://neon-devnet.blockscout.com/address/<contract_address>

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