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Questions tagged [erc20]

ERC-20 is a smart contract standard defining an interface and a set of rules for development of fungible tokens on the Ethereum platform.

462 questions
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Calling a solidity method from javascript

This is a pretty noob question which I thought wouldn't take too much time to answer through research. I am working on my first set of dapp building with basic javascript and solidity. Through it, I've been able to connect a wallet and send eth via…
DevSolidityDude
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Get user's wallet address in web3.js

I need to call an API that requires the user's wallet address. However, I can only get wallet's accounts by web3.eth.getAccounts() but not the wallet address. I am using WalletConnect and was able to create web3 instance. Thanks!
agentp
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How to create a custodial wallet per user on a plateform with Solidity?

I'm new in the blockchain community, and i have to realize a web 3.0 project. In this project, we have an ERC20, and for each user who sign up on our platform, I have to create a custodial wallet attached to this user. User A want to be able to send…
Boris Jerrar
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Exchange ERC20 (Ethereum) with SPL (Solana) via DEX

I've been searching for a while, but I can't seem to find an answer to this so it would be very helpful if someone can clarify this . Let's say i have TokenA as an ERC20 deployed to the Ethereum mainnet and I have TokenB as an SPL deployed in the…
Sergi Nogal
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web3dart estimating gas fee exception

I'm trying to estimate the gas fee for the ERC20 token transaction - in this case transferring DAI from one address to another (on Mumbai). The code for estimating the gas fee: final contract = DeployedContract(ContractAbi.fromJson(abi, token.id), …
Tom
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How can I get "Event Name & Method Name" via Polygonscan API?

Currently, the company which I am working in, they want to make a statistics system for P2E games which have (or will have) ERC-20 tokens based on Polygon. I have to accumulate the logs came from blockchain networks and game servers to know how much…
user3741031
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How to modify a transfer function of an ERC20 token so that it takes a fee equal to 0.0004 ether for every token transfer

As I understand I should make transfer function payable but it says "Overriding function changes state mutability from "payable" to "nonpayable".
wladknd
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How to transfer ETH on Rinkeby using ethers.js

Is there anybody who can help me with transfer ETH programmatically using ethers.js? I have some ETH on Rinkeby and want to transfer it to any address programmatically. Please let me know the address of ETH contract and how to transfer using…
Bikas Lin
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ERC20 Approve function calling error while Main net fork

it("TEST", async function () { let instanceOne = await ethers.getContractAt("IERC20", TOKEN_IN); let instanceTwo = await ethers.getContractAt("IERC20", TOKEN_OUT); let addr = contract.address; // error let val = await…
Priyansu Rath Munson
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Sending ERC20 tokens using web3j always pending

I am trying to send erc20 tokens using web3j , it always throw the protocol exception and transaction is always pending. Is there anything wrong i did in my code? Code: Web3j web3 = Web3j.build(new…
Rabindra Pangeni
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how can create USDT wallet address in nodejs and web3.js in ERC20

I have 2 networks. TRC-20 and ERC-20 networks. Now I want to use different coins on my site. For example, USDT, Doge, Bitcoin, and any currency in the ERC-20 and TRc-20 networks. When a user wants to transfer money from my site to a Binance site or…
Mr Coder
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Web3 BatchRequest always returning undefined, what am I doing wrong?

I'm trying to use the web3 Batch in order to call token balances all together. When I call batch.execute() it returns undefined instead of the resolved requests that have been added to the batch. Can someone enlighten me where I am messing things…
user16780074
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Mint new ERC20 token from other smart contract

Recently I am facing an issue while working on a smart contract that has staking functionality. Through the IERC20 interface, I manage to interact with Erc20 token from another contract but there is still one confusion left. I am working on a smart…
Usama Hassan
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Can we get Smart Contract address by Token Name

I want to get smart contract information by token name as Etherscan does but with my private network. According to web3 doc, If I need to get any information related to Smart Contract, I first need to have a smart contract address and ABI. But when…
Trimantra Software Solution
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Crowd Sale Contract Issue while minting token

I am currently working on a crowd sale contract, But I am having an issue with a function as the list of the error and the code of the function is attached, I need someone to tell me that what is happening in the code and how can i resolve the error…
Abubakar Mujahid
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