MORALIS SERIES

How to get ETH balance using Moralis with NodeJs API

In this tutorial, we’ll go over utilizing the Moralis Balance API and NodeJS to retrieve the ETH balance of a user’s wallet.

To set up the application, follow the instructions below.

1. Create a package.json file as below

npm init -y

2. Install moralis and @moralisweb3/evm-utils dependency as follows

npm i moralis @moralisweb3/evm-utils

3. Your package.json should contain the following

{
  "name": "moralis-eth-balance",
  "version": "1.0.0",
  "description": "",
  "main": "server.js",
  "scripts": {
    "start": "node server.js",
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@moralisweb3/evm-utils": "^2.7.4",
    "dotenv": "^16.0.3",
    "express": "^4.18.2",
    "moralis": "^2.7.4"
  }
}

4. Create a .env file which contains the Moralis API_KEY

API_KEY = “Your Moralis API Key”

5. Start the server in server.js

require('dotenv').config();
const express = require('express');

const app = express();

app.use(express.json());

app.listen(8080, async () => {
    console.log('server started');
});

6. Start Moralis in server.js

require('dotenv').config();
const express = require('express');
const Moralis = require('moralis').default;

const app = express();
const { API_KEY } = process.env;

app.use(express.json())

async function startMoralis() {
    try{
        await Moralis.start({
            apiKey: API_KEY,
        });
    }catch(err) {
        console.log(err);
    }
}

app.listen(8080, async () => {
    startMoralis();
    console.log('server started');
})

7. Add a GET endpoint /balance to get the ETH balance

require('dotenv').config();
const express = require('express');
const Moralis = require('moralis').default;
const { EvmChain } = require('@moralisweb3/evm-utils');

const app = express();
const { API_KEY } = process.env;

app.use(express.json())

async function startMoralis() {
    try{
        await Moralis.start({
            apiKey: API_KEY,
        });
    }catch(err) {
        console.log(err);
    }
}

app.get('/balance', async (req, res) => {
    const chain = EvmChain.ETHEREUM;
    const { address } = req.body;
    try{
        const response = await Moralis.EvmApi.balance.getNativeBalance({
            address,
            chain,
        });
        res.status(200).send(response.raw);
    }catch(err) {
        console.log(err);
    }

})


app.listen(8080, async () => {
    startMoralis();
    console.log('server started');
})

8. Test the endpoint using Postman

The test result is given below. Give the wallet address in req.body

Postman Test Result (Credits: Author)

Summary

Up to this point, we have talked about utilizing the Moralis Balance API and NodeJs to obtain the wallet balance. Open a Moralis account and play around with their APIs.

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