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Querying Blockchain.info: A Step-by-Step Guide

Blockchain.info is a popular online platform that provides access to various blockchain data, including Ethereum. In this article, we will demonstrate how to query the blockchain.info API with an address and determine the current balance, ignoring transactions without sufficient confirmations.

Prerequisites

Before you begin, make sure you have:

  • An Ethereum wallet (e.g. MetaMask, MyEtherWallet)
  • The Ethereum Blockchain Information API URL:
  • A working internet connection

Querying the Blockchain.info API

To query the blockchain.info API, you will need to send an HTTP request with a JSON payload containing your wallet address and other relevant information.

Here’s a step-by-step guide:

Step 1: Create a Wallet Object

First, create awalletobject in JavaScript that represents your Ethereum wallet. You can use a library like Web3.js or ethers.js to interact with the Ethereum blockchain.

const web3 = require('web3');
const Wallet = window.web3.eth.account.Wallet;
const account = Wallet.fromPrivateKey(Buffer.from('your-wallet-private-key'));

Step 2: Set the API Endpoint and Parameters

Set the api-endpointproperty of your wallet object to the blockchain.info API URL:

const wallet = new Wallet();
wallet.apiEndpoint = '

Add an optional parameter, address, that specifies the Ethereum address you want to query.

const address = '0xYourAddress';
wallet.address = address;

Step 3: Send a GET request

Send a GET request to the blockchain.info API with the parameters and your wallet address as query string parameters:

fetch(wallet.apiEndpoint +address=${address}&type=balance&confirmations=3, {
method: 'GET',
headers: { Accept: 'application/json' },
})
.then((response) => response.json())
.then((data) => console.log(data))
.catch((error) => console.error(error));

This will return a JSON object containing your current wallet balance, ignoring transactions without sufficient confirmations.

Example Use Case

Ethereum: How to query blockchain.info?

Here is an example use case:

const web3 = require('web3');
const Wallet = window.web3.eth.account.Wallet;
const address = '0xYourAddress';
const web3Instance = new web3.providers.HttpProvider('
const wallet = new Wallet();
wallet.apiEndpoint =
fetch(wallet.apiEndpoint + address=${address}&type=balance&confirmations=3, {
method: 'GET',
headers: { Accept: 'application/json' },
})
.then((response) => response.json())
.then((data) => console.log(data))
.catch((error) => console.error(error));

This code will query the blockchain.info API with your Ethereum address and ignore transactions without enough confirmations (3 confirmations).

Conclusion

In this article, we demonstrated how to query the blockchain.info API with an Ethereum address and determine the current balance, ignoring transactions without enough confirmations. By following these steps and using a JavaScript wallet object, you can easily access blockchain data and perform complex queries.

Remember to replace YOUR-Wallet-Private-Key with your actual Ethereum private key when creating the wallet object. Also, make sure you have the required dependencies installed (web3 or ethers.js) before running this code.

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