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Metamask: How to check if a token is already added in Metamask?
METAMASK: Verification If a Token in MetamSk is already added
As a cryptocurrency user, it is likely to be familiar with the importance of having a safe and decentralized wallet. One of those wallets is Metamk, which allows users to store, manage and spend their cryptocurrencies in multiple block chains. However, a common problem that can cause inconveniences for users is when they try to add a new token to their Metamask collection, but discover that it is already being used.
In this article, we will explore how to verify if a Token is already added in MetamSk using the web API. We will also provide some ideas about why this problem arises and possible solutions to avoid it in the future.
Why does Metamk not admit the verification of existing tokens?
Before immersing ourselves in the solution, let’s take a look why Metamask does not support directly verify if a token is already added or registered. The main reason is that Metamask is built on Ethereum, which has its own set of tokens management rules and regulations.
Ethereum’s Token standard (ERC-721) requires that tokens are unique within the block chain, which means that they cannot be duplicated or reused. This means that although a user could have added multiple instances of the same Token to his Metamask collection, it does not mean that they are all part of the same wallet.
How to verify if a token is already added in MetamSk using the web API
Unfortunately, there is no official way to verify if a specific token in MetamSk is already added using the web API. However, we can use some creative solutions to achieve this goal.
Here is an example of how you can implement a solution:
- Obtain the list of all tokens stored in MetamSk : You can use the ‘eth_getacunts
method with a call return function to obtain a list of accounts stored in MetamSk. Then, ITE through each account and verify if any of your wallets contains an instance of the token that interests you.
- Check the presence of Token in a specific wallet : If you know what wallet contains the desired token (for example, when looking for it in a specific direction), you can use the 'eth_gettransactiCount method to obtain a list of all the Transactions associated with that wallet. Then, itera through each transaction and verify if any of them contains an instance of the Token.
Here is some sample code in Javascript to demonstrate this:
`JavaScript
Function Async Hastoken (Tokenname) {
// Get the list of all tokens stored in MetamSk
Const accounts = alea window.ethereum.getacounts ();
For (account constitue) {
// Check if any of the wallet contains an instance of the token
For (const txid of Window.ethereum.gettransactionreceipts (account) .map (tx => tx.transactionash)) {
attempt {
// Obtain the details of the transaction
const tx = window.ethereum.gettransaction (transactionid);
// Check if the transaction contains an instance of the token
if (tx.data ['tokens'] && tx.data ['tokens'] [tokenname]) {
return true;
}
} capt (error) {
Console.error (error);
}
}
}
return false;
}
// Example use:
const tokenname = 'mytoken'; // Replace with the name of desired Token
Hastakin (Tokenname) .then (Hastoken => {
Ifo (Hastakin) {
Console.log (token $ {tokenname} is already added to your metamask wallet. ‘);
} others {
Console.log (You have no instance of Token $ {Tokenname} .
);
}
});
``
Conclusion
While there is no direct way to verify if a Token in MetamSk is already added using the web API, you can use high solutions as the previous example to achieve this goal.