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Here is an article on the subject:
METAMASK: ABI CAME WITH THE METAMASK RPC SUPPLIER FROM WEB3.JS
When working with decentralized applications (DAPPS) based on Ethereum, there is a common challenge to interact with intelligent contracts housed in the Ethereum network. One of the most convenient ways to do so is to use a tool as Metamk that offers a friendly API for the user to interaction with DAPPS through its web interfaces.
In his case, he wants to call the “balance of” Balance of an ERC20 intelligent contract (Token based on Ethereum), which is housed in the Ethereum Network. In this way, you must use the web3.js and Metamk RPC provider to make the call. So you can do it:
Step 1: Configure your MetamSk account
First, be sure to install a metamaster pocket and configure in your browser. If you still do not have a Metamk account, follow the following steps:
- Go to [MetamSk] on your browser (
- Click the “Create New Wallet” button.
- Follow the entry requests to create a new wallet.
Step 2: Install web3.js and configure your MetamSk -RPC
supplier **
To use Metamk’s RPC provider, you need web3.js. You can do this running the following command in your terminal:
`Bash
NPM Install Web3
After installing web3.js, you must configure your Metamask account to provide an RPC end point for the Ethereum network.
- Go to [My Ethechain] ( and create a new wallet.
- Click "Wallet"> "Add New Wallet".
- Follow the entry requests to add your wallet to my Ethechain.
- In the "Web3 supplier" configuration, select the RPC end point. You can choose between different suppliers, such as Infura, Alchemy or Local Node.
Step 3: Use the web3.js and Metamk RPC supplier to call the balance
After configuring your Metamask account with an RPC provider, it is time to use web3.js to make the "balance of" method, call from the ERC20 -SMART contract. "Here is a sample code:
JavaScript
Const web3 = new web3 (new web3.providers.httpprovider (
// Select the Ethereum account that is assigned to your Metamast Bag of Letters
Web3.eth.acounts.add ('0x ...');
// Call the RUFBALANCE METHOD OF THE INTELLIGENT CONTRACT ERC20
Web3.eth.call ({{{{
Method: 'balance',
Parameters: ['0x ...'],
Arguments: []
}, (Error, result) => {
If (errors) throw errors;
console.log (result);
});
In this example, we use the "Eth.Accous.add" method to select the Ethereum account, which is linked to its metamask letter pocket. Then we call the "Balancef contract of the ERC20 -Smart contract with the” eth.call “method of web3.
Diploma
With these steps, the Metamask web3.js RPC supplier has used successfully to call the “Balancef`” method through an ERC20 contract housed in the Ethereum Network. If this manual follows, you can easily interact with Ethereum based on Metamask and Web3.js.
