determination which token was made on the contract

When developing an intelligent agreement and implementing the functions of users, making sure that users can track allocated tokens, is crucial for transparency and security. In this article, we will examine how to determine which token user has set up a contract.

Understanding the ERC20 token standard

Before immersing in the solution, it is necessary to understand the ERC20 tokena standard. ERC-20 is an open standard to represent and trade digital tokens, designed by the co-founder Ethereum Joseph Lubin. Toxes can represent various assets, such as cryptocurrency, art and even utility tokens.

Using the API Etherscan to track the Stop tokens

One of the approaches to the determination which token user has set for a contract is the use of API Etherscan, provided by Polygon (previously Matic Network). Etherscan allows you to ask about intelligent contracts and receive information about the resources placed using built -in functions.

Here is an example of how you can use the API Etherscan interface to track the set tokens:

• Create a contract address : Replace `ok_Contract_address' with the address of the intelligent contract.

• Define the query function : Create a function that accepts two arguments:address' i To the tokenaddress. This function will return a object containing information about putting tokens on your contract.

Example:

Javascript

GetSteledkens function (address, tokenaddress) {

Const account = etherscan.connect ();

const

Return result;

}

• Call the function : When the user stops his token on the contract, call the “Getststaedtokens” function with their address and token identifier.

Example:

`Javascript

// User set ETH

Userstakeneth = wait for GetStedTokens (Useraddress, "0x1234567890ABCDEF");

• Recommend the result : API Etherscan returns an object containing information about each account on your contract. Go through this object to determine which tokens were erected by the user.

Example:

`Javascript

// User has set 100 ETH on his Ethereum account

Userstaketh = {

Account: "0x1234567890abdef",

Balance: 100,

tokens: ["Eth", "Eth", ...] // Additional information about bolted tokens

};

console.log (userstakeeth.tokens);

// Exit: ["ETH"]

additional considerations

While using the API Etherscan is a reliable way to track the tokens set, there are some restrictions and considerations:

* Gas ​​costs : Using the API Etherscan bears gas costs when asking about an intelligent contract. It can be expensive for large contracts or complex queries.

* Network fees

: If you use a decentralized application (DAPP) in Ethereum or other blockchain networks, you can pay network fees when asking about an intelligent contract.

Application

The term which token has been made on the contract is now easier thanks to the API Etherscan. Understanding how to ask about intelligent contracts and analyze the result, you can provide users with valuable information about their assigned tokens. Although you should remember some restrictions and considerations, this approach offers a reliable and efficient way of managing users’ functionality.

ETHEREUM COIN BEFORE