Ethereum: How to get which tokens have been transferred by a transaction using ethers or Web3?

Getting Ethereum Token Transfers Using Ethers and Web3

In the world of decentralized finance (DeFi), blockchain technology enables secure and transparent transactions. Among the many cryptocurrencies available, Ethereum is one of the most popular platforms for creating smart contracts and interacting with decentralized applications (dApps). When it comes to tracking token transfers, Ethereum’s native functionality can be quite complex, but there are ways to get this information using Ethers and Web3.

Understanding ERC721 Tokens

Before we get into the solution, let’s briefly review what ERC721 tokens are. ERC721 is a standard for creating non-fungible tokens (NFTs) on the Ethereum blockchain. These NFTs represent unique digital assets, such as artwork, collectibles, or in-game items. When a transaction occurs involving an ERC721 token, you want to know how many times that token has been transferred by a specific wallet or address.

Getting a Token Transfer Using Ether

To get the transfer number for a specific ERC721 token in a transaction, you can use Ether’s built-in functions. Here’s a step-by-step guide:

• Get the transaction data

  

  : First, you need to get the transaction data associated with the Ethereum network. You can do this by sending an eth_getTransaction request to the Ethereum API using the web3 library.

const web3 = require('web3');
const ethers = require('web3');
const web3Instance = new web3(new Web3.providers.HttpProvider('
const transaction = await web3Instance.eth.getTransactionByHash('0x...'); // Replace with transaction hash
const contractAddress = '0x...'; // ERC721 token contract address

• Get the contract ABI

  : Before you can get the transfer count, you need to get the ABI (Application Binary Interface) of the ERC721 contract.

transaction.abi.forEach((bytecode) => {
const abi = JSON.parse(bytecode.toString());
// Get the name and symbol of the ERC721 token from its ABI
const ContractName = abi.name;
const contractSymbol = abi.symbol;
});

• Get the transfer count: You can now use contractAddress to get the transfer count using the Ethers built-in function, eth_getTransferCount.

const transferCount = await ethers.getContractInfoAsync(contractAddress, 'balanceOf');

Getting Token Transfers Using Web3

While Ethers provide a simpler way to retrieve transaction data and contract information, Web3 offers additional features for interacting with smart contracts.

To get the transfer count for an ERC721 token from a specific wallet or address on Ethereum, you can use Ethers’ “eth_getTransactionCount” function with the following parameters:

• chainId: Chain ID to target (e.g. 1 for Ethereum Mainnet)

• transactionHash: Transaction hash

• contractAddress: ERC721 contract address

const web3Instance = new web3(new Web3.providers.HttpProvider('
const transactionHash = '0x...'; // Replace with transaction hash
const contractAddress = '0x...'; // ERC721 token contract address
const transferCount = await ethers.getContractInfoAsync(contractAddress, 'balanceOf', {
chainId: web3Instance.eth.net === 'mainnet'? 1: web3Instance.eth.net,
transactionHash,
});

Conclusion

In short, you can retrieve information about the number of transfers for an ERC721 token from a specific wallet or address on Ethereum using Ethers. By understanding how to retrieve transaction data and contract ABI, as well as using the Web3 function eth_getTransactionCount, you can obtain this valuable information.