# Tools

# Interaction tools

# Geth client

Interact with your Harmony nodes using Geth (opens new window).

  1. Install Geth (opens new window).

  2. Use the geth attach command with the node endpoint.

geth attach ENDPOINT

where

  • ENDPOINT — your node HTTPS or WSS endpoint.

See also View node access and credentials.

Example:

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geth attach https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d
  1. Invoke methods from Web3 JavaScript API (opens new window).

Example below demonstrates how to get the balance of an address in wei value and convert it to ether value:

> web3.fromWei(web3.eth.getBalance("0x6b3595068778dd592e39a122f4f5a5cf09c90fe2"))
1234

# MetaMask

You can set your MetaMask (opens new window) to interact through your Harmony nodes deployed with Chainstack.

  1. Open your MetaMask and click the network selector.

  2. In the network selector, click Custom RPC.

  3. In the New RPC URL field, enter the endpoint. See View node access and credentials.

    Example:

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    https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d
    
  4. In the Chain ID field, enter the ID of the network:

    • Mainnet Shard 0: 1666600000
    • Devnet Shard 0: 1666900000
  5. Click Save.

See also View node access and credentials.

# Development tools

# Truffle

Configure Truffle Suite (opens new window) to deploy contracts to your Harmony nodes.

  1. Install Truffle Suite (opens new window), HD Wallet-enabled Web3 provider (opens new window), and create a project.

  2. Create a new environment in truffle-config.js, add your mnemonic phrase generated by a wallet (opens new window) and the node endpoint:

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const HDWalletProvider = require("@truffle/hdwallet-provider");
const mnemonic = 'pattern enroll upgrade ...';
...
module.exports = {
 networks: {
    chainstack: {
        provider: () => new HDWalletProvider(mnemonic, "https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d"),
        network_id: "*"
    },
   }
  }
};

# Hardhat

Configure Hardhat (opens new window) to deploy contracts and interact through your Harmony nodes.

  1. Install Hardhat (opens new window) and create a project.

  2. Create a new environment in hardhat.config.js:

require("@nomiclabs/hardhat-waffle");
...
module.exports = {
  solidity: "0.7.3",
  networks: {
    chainstack: {
        url: "ENDPOINT",
        accounts: ["PRIVATE_KEY"]
    },
   }
};

where

  • ENDPOINT — your node HTTPS or WSS endpoint.
  • PRIVATE_KEY — the private key of the account that you use to deploy the contract.

See also View node access and credentials.

Example:

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require("@nomiclabs/hardhat-waffle");
...
module.exports = {
  solidity: "0.7.3",
  networks: {
    chainstack: {
        url: "https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d",
        accounts: ["ee5dda7d38d194783d32adcfc961401108b8fdde27e8fee115553959d434e68b"]
    },
   }
};
  1. Run npx hardhat run scripts/deploy.js --network chainstack and Hardhat will deploy using Chainstack.

# web3.js

Build DApps using web3.js (opens new window) and Harmony nodes deployed with Chainstack.

# HTTP

  1. Install web3.js (opens new window).
  2. Use the HttpProvider object to connect to your node HTTPS endpoint.
const Web3 = require('web3');

const web3 = new Web3(new Web3.providers.HttpProvider('ENDPOINT'));

where

  • ENDPOINT — your node HTTPS endpoint.

Example to get the latest block number:

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const Web3 = require('web3');

const web3 = new Web3(new Web3.providers.HttpProvider('https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d'));

web3.eth.getBlockNumber().then(console.log);

# WebSocket

  1. Use the WebsocketProvider object to connect to your node WSS endpoint.
const Web3 = require('web3');

const web3 = new Web3(new Web3.providers.WebsocketProvider('ENDPOINT'));

where

  • ENDPOINT — your node WSS endpoint.

Example to get the latest block number:

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const Web3 = require('web3');

const web3 = new Web3(new Web3.providers.WebsocketProvider('wss://ws-nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d'));

web3.eth.getBlockNumber().then(console.log);

# web3.py

Build DApps using web3.py (opens new window) and Harmony nodes deployed with Chainstack.

  1. Install web3.py (opens new window).
  2. Connect over HTTP or WebSocket. See also EVM node connection: HTTP vs WebSocket.

# HTTP

Use the HTTPProvider to connect to your node HTTPS endpoint.

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from web3 import Web3

web3 = Web3(Web3.HTTPProvider('ENDPOINT'))

where

  • ENDPOINT — your node HTTPS endpoint.
  • HOSTNAME — your node HTTPS endpoint hostname.
  • USERNAME — your node access username.
  • PASSWORD — your node access password.

Example to get the latest block number:

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from web3 import Web3

web3 = Web3(Web3.HTTPProvider('https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d'))
print(web3.eth.blockNumber)

# WebSocket

Use the WebsocketProvider object to connect to your node WSS endpoint.

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from web3 import Web3

web3 = Web3(Web3.WebsocketProvider('ENDPOINT'))

where

  • ENDPOINT — your node WSS endpoint.
  • HOSTNAME — your node WSS endpoint hostname.
  • USERNAME — your node access username.
  • PASSWORD — your node access password.

Example to get the latest block number:

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from web3 import Web3

web3 = Web3(Web3.WebsocketProvider('wss://ws-nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d'))
print(web3.eth.blockNumber)

# web3.php

Build DApps using web3.php (opens new window) and Harmony nodes deployed with Chainstack.

  1. Install web3.php (opens new window).
  2. Connect over HTTP:
<?php

require_once "vendor/autoload.php";

use Web3\Web3;
use Web3\Providers\HttpProvider;
use Web3\RequestManagers\HttpRequestManager;

$web3 = new Web3(new HttpProvider(new HttpRequestManager("ENDPOINT", 5)));
?>

where ENDPOINT is your node HTTPS endpoint.

  1. Use JSON-RPC methods (opens new window) to interact with the node.

Example to get the latest block number:

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<?php

require_once "vendor/autoload.php";

use Web3\Web3;
use Web3\Providers\HttpProvider;
use Web3\RequestManagers\HttpRequestManager;

$web3 = new Web3(new HttpProvider(new HttpRequestManager("https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d", 5)));

$eth = $web3->eth;

$eth->blockNumber(function ($err, $data) {
        print "$data \n";
});
?>

# ethers.js

Build DApps using ethers.js (opens new window) and Harmony nodes deployed with Chainstack.

  1. Install ethers.js (opens new window).
  2. Connect over HTTP or WebSocket.

# HTTP

Use the JsonRpcProvider object to connect to your node HTTPS endpoint.

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

var urlInfo = {
    url: 'ENDPOINT'
};
var provider = new ethers.providers.JsonRpcProvider(urlInfo, NETWORK_ID);

where

  • ENDPOINT — your node HTTPS endpoint.
  • USERNAME — your node access username.
  • PASSWORD — your node access password.
  • NETWORK_ID — Harmony network ID:
    • Mainnet Shard 0: 1666600000
    • Devnet Shard 0: 1666900000

Example to get the latest block number on mainnet:

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

var urlInfo = {
    url: 'https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d'
};
var provider = new ethers.providers.JsonRpcProvider(urlInfo, 1666600000);

provider.getBlockNumber().then(console.log);

# WebSocket

Use the WebSocketProvider object to connect to your node WSS endpoint.

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

const provider = new ethers.providers.WebSocketProvider('ENDPOINT', NETWORK_ID);

where

  • ENDPOINT — your node WSS endpoint.
  • NETWORK_ID — Harmony network ID:
    • Mainnet Shard 0: 1666600000
    • Devnet Shard 0: 1666900000

Example to get the latest block number on mainnet:

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

const provider = new ethers.providers.WebSocketProvider('wss://ws-nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d', 1666600000);

provider.getBlockNumber().then(console.log);

# Brownie

  1. Install Brownie (opens new window).
  2. Use the brownie networks add command with the node endpoint:
brownie networks add Harmony ID name="NETWORK_NAME" host=KEY_ENDPOINT chainid=NETWORK_ID

where

  • ID — any name that you will use as the network tag to run a deployment. For example, chainstack-mainnet.
  • NETWORK_NAME — any name that you want to identify the network by in the list if networks. For example, Mainnet (Chainstack).
  • ENDPOINT — your node HTTPS or WSS endpoint.
  • NETWORK_ID — Harmony network ID:
    • Mainnet Shard 0: 1666600000
    • Devnet Shard 0: 1666900000

Example to add a Harmony mainnet node to the list of Brownie networks:

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brownie networks add Harmony harmony-mainnet name="Mainnet (Chainstack)" host=https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d chainid=1666600000

Example to run the deployment script:

brownie run deploy.py --network harmony-mainnet

# Foundry

  1. Install Foundry (opens new window).
  2. Use --rpc-url to run the operation through your Chainstack node.

# Forge

Use forge (opens new window) to develop, test, and deploy your smart contracts.

To deploy a contract:

forge create CONTRACT_NAME --contracts CONTRACT_PATH --private-key PRIVATE_KEY --rpc-url ENDPOINT

where

  • CONTRACT_NAME — name of the contract in the Solidity source code.
  • CONTRACT_PATH — path to your smart contract.
  • PRIVATE_KEY — the private to your funded account that you will use to deploy the contract.
  • ENDPOINT — your node HTTPS endpoint.

Example to deploy the simple storage (opens new window) contract:

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forge create SimpleStorage --contracts /root/foundry/contracts/simplestorage.sol --private-key 9c4b7f4ad48f977dbcdb2323249fd738cc9ff283a7514f3350d344e22c5b923d --rpc-url https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d

# Cast

Use cast (opens new window) to interact with the network and the deployed contracts.

To get the latest block number:

cast block-number --rpc-url ENDPOINT

where ENDPOINT is your node HTTPS endpoint.

Example:

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cast block-number --rpc-url https://nd-123-456-789.p2pify.com/3c6e0b8a9c15224a8228b9a98ca1531d