Right this moment’s tutorial demonstrates get the ERC20 token stability of an handle with the Moralis Token API. Because of the accessibility of this instrument, all you want is a single API name to the getWalletTokenBalances() endpoint. Right here’s an instance of what it could possibly seem like:
const Moralis = require(“moralis”).default;
const { EvmChain } = require(“@moralisweb3/common-evm-utils”);
const runApp = async () => {
await Moralis.begin({
apiKey: “YOUR_API_KEY”,
// …and every other configuration
});
const handle = “0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d”;
const chain = EvmChain.ETHEREUM;
const response = await Moralis.EvmApi.token.getWalletTokenBalances({
handle,
chain,
});
console.log(response.toJSON());
};
runApp();
All it’s important to do is substitute YOUR_API_KEY together with your Moralis API key, configure the handle and chain parameters to suit your request, and run the code. In return, you’ll get an array of tokens containing the stability for every:
[
{
“token_address”: “0x3c978fc9a42c80a127863d786d8883614b01b3cd”,
“symbol”: “USDT”,
“name”: “USDTOKEN”,
“logo”: null,
“thumbnail”: null,
“decimals”: 18,
“balance”: “10000000000000000000000”,
“possible_spam”: true
},
{
“token_address”: “0xdac17f958d2ee523a2206206994597c13d831ec7”,
“symbol”: “USDT”,
“name”: “Tether USD”,
“logo”: “https://cdn.moralis.io/eth/0xdac17f958d2ee523a2206206994597c13d831ec7.png”,
“thumbnail”: “https://cdn.moralis.io/eth/0xdac17f958d2ee523a2206206994597c13d831ec7_thumb.png”,
“decimals”: 6,
“balance”: “102847”,
“possible_spam”: false
},
//…
]
That’s it; when working with Moralis, it’s simple to get the ERC20 token stability of an handle. From right here, now you can use this information and effortlessly combine it into your Web3 initiatives!
In case you’d wish to study extra about how this works, be part of us on this article or take a look at the official documentation on get ERC20 token stability by a pockets.
Additionally, keep in mind to enroll with Moralis, as you’ll want an account to comply with alongside on this tutorial. You’ll be able to register completely free of charge, and also you’ll achieve quick entry to the trade’s main Web3 APIs!
Overview
A necessary side of most blockchain functions – together with wallets, decentralized exchanges (DEXs), portfolio trackers, and Web3 analytics instruments – are ERC20 token balances. Consequently, it doesn’t matter what decentralized software (dapp) you’re constructing, you’ll doubtless want the flexibility to effortlessly get the ERC20 token stability of an handle. Nonetheless, querying and processing this information with out correct improvement instruments is a tedious and time-consuming process. Luckily, now you can keep away from the difficult elements by leveraging the Moralis Token API to get the ERC20 token stability of an handle very quickly!
In immediately’s article, we’ll begin by going again to fundamentals and briefly look at what a token stability is. From there, we’re additionally going to discover ERC20, as that is the most well-liked commonplace for fungible tokens. Subsequent, we’ll leap straight into the tutorial and present you seamlessly get the ERC20 token stability of an handle utilizing the Moralis Token API. To prime issues off, we’ll additionally present you use the Token API to get the spender allowance of an ERC20 token!
In case you already know what a token stability is and what the ERC20 token commonplace entails, be happy to skip straight into the ”Tutorial: The best way to Get the ERC20 Token Steadiness of an Tackle” part!
Additionally, for those who’re critical about constructing Web3 initiatives, you’ll doubtless need to take a look at another instruments Moralis gives apart from the Token API. As an illustration, two different superb interfaces are Moralis’ free NFT API and the free crypto Value API. With these instruments, you’ll be able to seamlessly construct Web3 initiatives in a heartbeat!
So, in order for you entry to the trade’s main Web3 APIs, keep in mind to enroll with Moralis so you can begin leveraging the true energy of blockchain expertise immediately!
What’s a Token Steadiness?
A token stability refers back to the quantity of a selected cryptocurrency an account or pockets holds. Within the crypto world, there are two major fungible token sorts: native and non-native tokens. Let’s take a look at every a bit bit deeper:
Native Tokens: A local token is a blockchain community’s base cryptocurrency. All unbiased blockchains have their very own native token. And so they have a variety of utility inside their respective ecosystems. As an illustration, a local token is usually used to reward validators/miners and pay for transaction charges. A distinguished instance is ETH, which is the native token of the Ethereum community. Non-Native Tokens: Non-native tokens are created on prime of an present community – corresponding to Ethereum – utilizing sensible contracts. These tokens are sometimes created by a Web3 challenge and are solely used inside its personal borders. Examples of non-native tokens embrace DAI, USDT, and USDC.
So, when speaking a couple of token stability, we sometimes check with the quantity of a selected native or non-native token an account or pockets holds. Furthermore, although there are numerous varieties of fungible tokens, they largely comply with the ERC20 token commonplace. However what precisely does this imply? And the way does ERC20 work?
What’s ERC20?
ERC20, or Ethereum Request for Remark 20, is a technical commonplace for sensible contracts on the Ethereum blockchain and different EVM-compatible networks. This commonplace defines a algorithm, capabilities, and occasions {that a} token should implement for it to be thought-about ERC-20 compliant.
The capabilities and occasions outlined within the ERC20 token commonplace present a typical interface for all tokens to allow them to be simply accessed, acknowledged, and used. As an illustration, one of many capabilities is balanceOf(), guaranteeing that it’s potential to seamlessly get a consumer’s stability of any ERC20 token.
However, this commonplace interface ensures a unified ecosystem the place all tokens are suitable with each other, together with decentralized functions (dapps) and different Web3 initiatives. Some distinguished examples of ERC20 tokens embrace ETH, USDC, USDT, SHIB, and lots of others!
Additionally, whereas ERC20 is the most well-liked and well-used token commonplace, it’s removed from the one one. Two extra requirements are ERC721 and ERC1155, that are used to manage NFTs on the Ethereum blockchain. In case you’d wish to study extra about these, take a look at our article on ERC721 vs. ERC1155!
However, now that you’ve got a greater understanding of what ERC20 entails, let’s leap straight into the tutorial and present you get a pockets’s ERC20 token stability!
Tutorial: The best way to Get the ERC20 Token Steadiness of an Tackle
The perfect and most easy strategy to get the ERC20 token stability of a consumer is to leverage the Moralis Token API. This API offers real-time ERC20 token information, permitting you to fetch costs, transfers, and, in fact, balances with a single line of code!
The API can also be cross-chain suitable, supporting ten-plus EVM chains, together with Ethereum, BNB Good Chain, Polygon, and lots of others. As such, with Moralis, it has by no means been simpler to construct crypto wallets, portfolio trackers, or Web3 token analytics instruments!
However, to focus on the accessibility of this instrument, we’ll take the next sections to point out you get the ERC20 token stability of a consumer in three easy steps:
Get an API KeyWrite a ScriptRun the Code
However earlier than we leap into step one of the tutorial, you’ll need to care for a couple of conditions!
Conditions
On this tutorial, we’ll present get the ERC20 token stability of a consumer with JavaScript. Nonetheless, it’s also possible to use TypeScript and Python for those who want. However if so, be aware that the steps outlined on this tutorial would possibly differ barely.
However, earlier than you get going, you’ll must have the next prepared:
From right here, you have to set up the Moralis SDK. To take action, arrange a brand new challenge in your built-in improvement setting (IDE) and run the next terminal command in your challenge’s root folder:
npm set up moralis @moralisweb3/common-evm-utils
That’s it; you’re now prepared to leap into step one of this tutorial on get the ERC20 token stability of a consumer!
Step 1: Get an API Key
You’ll initially want a Moralis API key, which is required for making calls to the Token API. Luckily, you will get your API key free of charge. All it’s important to do is join with Moralis by clicking on the ”Begin for Free” button on the prime proper of the Moralis homepage:
When you’re achieved organising an account and your first challenge, yow will discover the important thing by navigating to the ”Settings” tab. From there, you’ll be able to merely scroll down and duplicate your Moralis API key:
Save the important thing, as you’ll want it within the subsequent step!
Step 2: Write a Script
With a Moralis API key at hand, you’re prepared to begin coding. As such, arrange a brand new ”index.js” file in your challenge’s root folder and add the next code:
const Moralis = require(“moralis”).default;
const { EvmChain } = require(“@moralisweb3/common-evm-utils”);
const runApp = async () => {
await Moralis.begin({
apiKey: “YOUR_API_KEY”,
// …and every other configuration
});
const handle = “0xbc4ca0eda7647a8ab7c2061c2e118a18a936f13d”;
const chain = EvmChain.ETHEREUM;
const response = await Moralis.EvmApi.token.getWalletTokenBalances({
handle,
chain,
});
console.log(response.toJSON());
};
runApp();
That is all of the code you have to get the ERC20 token stability of a consumer. Nonetheless, you have to make a couple of minor configurations earlier than you’ll be able to run the script.
To start with, substitute YOUR_API_KEY with the important thing you copied within the earlier step:
Subsequent, you have to configure the handle and chain parameters to suit your request. For the handle const, add the pockets handle from which you need to get the ERC20 token stability. And for chain, you’ll be able to change the community for those who want to question a blockchain apart from Ethereum:
From there, we then move the parameters when calling the getWalletTokenBalances() endpoint:
That is it; that’s all of the code you have to get the ERC20 token stability of a consumer. All that continues to be from right here is working the script!
Step 3: Run the Code
To run the script, merely open a terminal, cd into the challenge’s root folder, and execute the next command:
node index.js
In return, you’ll get a response containing an array of ERC20 tokens together with the stability for every cryptocurrency. Right here’s an instance of what it’d seem like:
[
{
“token_address”: “0x3c978fc9a42c80a127863d786d8883614b01b3cd”,
“symbol”: “USDT”,
“name”: “USDTOKEN”,
“logo”: null,
“thumbnail”: null,
“decimals”: 18,
“balance”: “10000000000000000000000”,
“possible_spam”: true
},
{
“token_address”: “0xdac17f958d2ee523a2206206994597c13d831ec7”,
“symbol”: “USDT”,
“name”: “Tether USD”,
“logo”: “https://cdn.moralis.io/eth/0xdac17f958d2ee523a2206206994597c13d831ec7.png”,
“thumbnail”: “https://cdn.moralis.io/eth/0xdac17f958d2ee523a2206206994597c13d831ec7_thumb.png”,
“decimals”: 6,
“balance”: “102847”,
“possible_spam”: false
},
//…
]
From right here, now you can effortlessly combine the ERC20 token stability information into your initiatives!
The best way to Get Spender Allowance of an ERC20 Token
Along with getting the ERC20 token stability of a consumer, the Moralis Token API additionally means that you can question the spender allowance of an ERC20 token. However what precisely is the spender allowance?
ERC20 token allowance refers back to the quantity {that a} spender is allowed to withdraw on behalf of the proprietor. That is frequent when interacting with dapps like Uniswap, giving the platform the correct to switch the tokens you maintain in your pockets.
So, how will you get the spender allowance of an ERC20 token?
Nicely, because of the accessibility of the Moralis Token API, you’ll be able to comply with the identical steps from the ”Tutorial: The best way to Get the ERC20 Token Steadiness…” part. The one distinction is that you have to name the getTokenAllowance() endpoint as an alternative of getWalletTokenBalances().
As such, if you wish to get the spender allowance of an ERC20 token, merely substitute the contents in your ”index.js” file with the next code:
const Moralis = require(“moralis”).default;
const { EvmChain } = require(“@moralisweb3/common-evm-utils”);
const runApp = async () => {
await Moralis.begin({
apiKey: “YOUR_API_KEY”,
// …and every other configuration
});
const chain = EvmChain.ETHEREUM;
const handle = “0x514910771AF9Ca656af840dff83E8264EcF986CA”;
const ownerAddress = “0x7c470D1633711E4b77c8397EBd1dF4095A9e9E02”;
const spenderAddress = “0xed33259a056f4fb449ffb7b7e2ecb43a9b5685bf”;
const response = await Moralis.EvmApi.token.getTokenAllowance({
handle,
chain,
ownerAddress,
spenderAddress,
});
console.log(response.toJSON());
};
runApp();
From right here, you’ll then want so as to add your API key by changing YOUR_API_KEY:
Subsequent, you need to configure the parameters, and as you’ll rapidly discover, there are a couple of extra this time. For the handle parameter, you have to add the token handle. For ownerAddress, add the handle of the token proprietor. And for spenderAddress, add the handle of the token spender:
We then move these parameters when calling the getTokenAllowance() endpoint:
When you run the code, you’ll get a response trying one thing like this:
{
“allowance”: “0”
}
And that’s it! That is how simple it’s to get the spender allowance of an ERC20 token when working with Moralis!
For a extra detailed breakdown of how this works, take a look at the get spender allowance of an ERC20 token documentation!
Abstract: The best way to Get the Steadiness of ERC20 Tokens
In immediately’s article, we launched you to ERC20 token balances. In doing so, we defined what they’re and how one can get the ERC20 token stability of a consumer with the Moralis Value API in three steps:
Get an API KeyWrite a ScriptRun the Code
You probably have adopted alongside this far, you now know get the ERC20 token stability of any handle. Now you can use this newly acquired talent to begin constructing your first Web3 challenge!
If that is your ambition, then you need to know that the Token API works like a dream along with our suite of extra crypto APIs. You’ll be able to, as an example, mix the Token API with the Moralis NFT API to combine NFT information into your initiatives. In case you’d wish to study extra about this, take a look at our articles on get NFT ERC721 on-chain metadata or get all NFT tokens owned by a consumer handle.
Additionally, for those who preferred this tutorial, think about testing extra content material right here on the Web3 weblog. For instance, dive into consideration abstraction, discover the trade’s main NFT picture API, or discover ways to write a sensible contract in Solidity!
Lastly, don’t overlook to enroll with Moralis if you wish to entry the trade’s main Web3 APIs. Creating an account is free, and as a consumer of Moralis, you’ll be capable of construct initiatives quicker and smarter!
