Ethereum: How to find out which tokens were transferred in transactions using ethers or Web3?

Getting Token Transfers on Ethereum 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 dive 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 are unique digital assets, such as art, collectibles, or in-game items. If there is a transaction involving an ERC721 token, you want to know how many times that particular token has been transferred from a specific wallet or address.

Getting Token Transfers Using Ethers

To get the number of transfers of a specific ERC721 token from a transaction, you can use Ethers built-in functions. Below is a step-by-step guide.

• Get Transaction Data: First, you need to retrieve the transaction data associated with the Ethereum network. This can be done 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 your transaction hash
const contractAddress = '0x...'; // ERC721 token contract address

• Get the contract ABI: Before you can get the number of transfers, you need to get the ERC721 contract ABI (Application Binary Interface).

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

• Get the number of transfers

  : You can now use contractAddress' to get the number of transfers using Ether's built-in function “eth_getTransferCount”.

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

To get the number of ERC721 token transfers from a specific Ethereum wallet or address, you can use the Ethers function eth_getTransactionCount’ with the following parameters:

• chainId: The chain ID to target (e.g. 1 Ethereum Mainnet)

• transactionHash: The transaction hash

• contractAddress: The ERC721 contract address

const web3Instance = new web3(new Web3.providers.HttpProvider('
const transactionHash = '0x...'; // Replace with your 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 summary, you can retrieve information about the number of ERC721 token transfers from a specific wallet or address in Ethereum using Ethers. By understanding how to get transaction data and contract ABI, as well as using the Web3 function “eth_getTransactionCount”, you can obtain this valuable information.