Interacting with ERC-721 Tokens Using the Safe SDK: A Guide
The Ethereum Solidity programming language, built on the Ethereum Virtual Machine (EVM), provides a set of libraries and tools for interacting with various components of the Ethereum ecosystem. One such component is the ERC-721 token standard, which allows developers to create, manage, and transfer unique digital assets, known as NFTs.
In this article, we’ll explore how to interact with ERC-721 tokens using the Safe SDK, a library that simplifies the process of building decentralized applications (dApps) on the Ethereum network.
ERC-721 Token Overview
Before we dive into interacting with ERC-721 tokens, let’s quickly review what they are:
- An ERC-721 token is a unique digital asset that can be stored, transferred, and traded on the Ethereum blockchain.
- Each ERC-721 token has a unique identifier, called a “token ID”.
- Tokens can represent anything from art to collectibles, and their value and usage varies widely.
Safe SDK: Interacting with ERC-721 Tokens
The Safe SDK provides a set of functions to interact with various components of the Ethereum ecosystem. To interact with ERC-721 tokens using the Safe SDK, you will need to use the “ethers.js” library in conjunction with the Safe SDK.
Here is an example of how you can use the Safe SDK to list, transfer, and balance ERC-721 tokens:
// Import the necessary libraries
const ethers = require('ethers');
const safeSdk = require('@safe-sdk/ethereum-safe-sdk');
// Configure your Ethereum provider (e.g. Infura or Alchemy)
const provider = new ethers.providers.JsonRpcProvider(' // or '
// Set the ERC-721 contract address
const erc721ContractAddress = '0x...'; // replace with your token's contract address
// List all tokens available on the blockchain
safeSdk.getTokens().then(tokens => {
const tokenIds = tokens.map(token => token.id);
// Search for a specific token by ID
safeSdk.getToken('0x...').then(token => {
console.log(Token found with ID: ${token.id});
// Transfer ownership of the token to another address
safeSdk.transferOwnership(erc721ContractAddress, '0x...', { from: '0x...'}).then(() => {
console.log('Token successfully transferred');
}).catch(error => {
console.error('Error transferring token:', error);
});
});
// List the balances of all tokens
safeSdk.getBalances().then(balances => {
const balanceResults = balances.map(balance => balance.balance);
console.log(Available tokens with their balances:);
console.log(balanceResults);
});
});
In this example, we set up a simple Ethereum provider and set the ERC-721 contract address. We then use the getTokens() function to list all the ERC-721 token IDs available on the blockchain.
To find a specific token by ID, we use the getToken() function. In this case, we simply pass the token ID 0x....
To transfer ownership of a token to another address, we use the transferOwnership() function. We pass the ERC-721 contract address, the new owner address, and a JSON object containing the “from” and “to” properties.
Finally, to list the balances of all tokens, we use the getBalances() function.
Interactions with ERC-20 tokens
While the Safe SDK provides an interface to interact with ERC-721 tokens, it does not provide a direct way to interact with ERC-20 tokens. However, you can still use the same library to perform these interactions using the following code:
“`javascript
// Import the necessary libraries
const ethers = require(‘ethers’);
const safeSdk = require(‘@safe-sdk/ethereum-safe-sdk’);
// Configure your Ethereum provider (e.g. Infura or Alchemy)
const provider = new ethers.providers.