Metamask: How can you know which token was staked on your contract?

Determining Which Token is Staked in Your Contract

As you develop your smart contract and implement user stake functionality, ensuring that users can track their allocated tokens is critical for transparency and security. In this article, we will explore how to determine which token a user has staked in your contract.

Understanding the ERC20 Token Standard

Before diving into the solution, it is important to understand the ERC20 token standard. ERC-20 is an open standard for representing and trading digital tokens, designed by Ethereum co-founder Joseph Lubin. Tokens can represent a variety of assets, such as cryptocurrency, artwork, or even utility tokens.

Using the Etherscan API to Track Staked Tokens

One approach to determining which token a user has staked in your contract is to use the Etherscan API, offered by Polygon (formerly Matic Network). Etherscan allows you to query your smart contracts and retrieve information about invested assets using its built-in functions.

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

• Create a contract address: Replace YOUR_CONTRACT_ADDRESS with the address of your smart contract.

• Define a function for the query: Create a function that takes two arguments: address and tokenAddress. This function will return an object containing information about the tokens staked in your contract.

Example:

function getStakedTokens(address, tokenAddress) {
const account = Etherscan.connect();
const result = await account.getAccountsByTokenId({tokenid:tokenAddress});
return result;
}

• Call the function

  : When a user stakes their token in your contract, call the getStakedTokens function with their address and token ID.

Example:

// User Staked ETH
userStakedEth = await getStakedTokens(userAddress, '0x1234567890abcdef');

• Parse the result: The Etherscan API returns an object containing information about each account in your contract. Parse this object to determine which tokens the user has staked.

Example:

// User deposits 100 ETH into their Ethereum account
userStakedEth = {
account: '0x1234567890abcdef',
balance: 100,
tokens: ['ETH', 'ETH', ...] // additional information about the staked tokens
};
console.log(userStakedEth.tokens);
// Output: ['ETH']

Additional Considerations

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

• Gas Costs: Using the Etherscan API incurs gas costs when querying your smart contract. This can be expensive for large contracts or complex queries.

• Network Fees: If you are running a decentralized application (dApp) on Ethereum or other blockchain networks, you may incur network fees when making requests to your smart contract.

Conclusion

Determining which token is invested in your contract is now easier with the Etherscan API. By understanding how to query your smart contracts and analyze the results, you can provide users with valuable information about their assigned tokens. While there are some limitations and considerations to keep in mind, this approach offers a reliable and efficient way to manage user sharing functionality.

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