I'm following a tutorial on Solidity and Python (for reference https://www.youtube.com/watch?v=M576WGiDBdQ&t=5447s). I'm at the stage where Python and Brownie have been installed and running th...

I have the following function enum OptionType {Invalid, Put, Call} function create( uint256 period, uint256 amount, uint256 strike, OptionType optionType ) { .... } When I try to delegatec...

I am using the ethers.js documentation: https://docs.ethers.io/ethers.js/html/cookbook-providers.html . I am getting the error when setting up the provider -: Uncaught ReferenceError: web3 is not d...

I'm dealing with a strange issue with the safeTransferETH helper function in Uniswap V2's router contract. I'm trying to swap tokens held by the contract to Uniswap for Ether, using the swapExactTo...

I am trying to deploy a contract on Goerli, but I constantly get the error Error HH100: Network goerli doesn't exist Here is my hardhat.config.ts require("dotenv").config(); import { task...

I was trying to get keys of a mapping to star name and address of particular contract (not exactly) in solidity contract mapping(string=>address) nameOfAccounts; What i am expecting is a method...

I am working with web3-react and I cannot figure out how to keep the connection to the MetaMask wallet persistent upon browser refreshes. This is the code: // define the injectedConnectors const i...

What would be the address if I want to swap tokens from ETH? ISwapRouter.ExactOutputSingleParams memory params = ISwapRouter.ExactOutputSingleParams({ tokenIn: TOKEN_IN_ADDRESS, tokenOut: TOKEN_...

I understand bitcoin uses blockchain technology to maintain a decentralised ledger of all transactions. I have also read many posts eluding to future applications of blockchain technology, no...

I installed truffle through npm with the following: sudo npm install -g truffle but when I run truffle list on the console it just gives me bash: truffle: command not found

I'm trying to interact with geth, and I need to create a new deposit address (and be able to control it). How can I implement this with web3.js?

I would like to connect Remix - Ethereum IDE (https://remix.ethereum.org) to localhost. I followed the instructions https://remix-ide.readthedocs.io/en/latest/remixd.html#update-to-the-latest...

I am trying to send ETH from one account to another but the conversion from ETH to WEI keeps giving me headaches. In this case, I am trying to send 0.11 ETH but in the confirmation window, I get 31...

i want to do a transaction in ethereum from account A but the transaction fee should be paid from account B. is it possible in ethereum?

I am new to deploying smart contracts with hardhat and am following a tutorial at https://dev.to/dabit3/the-complete-guide-to-full-stack-ethereum-development-3j13. However, after running npx hardha...

I am getting error with both latest solc (0.5.2 version) and 0.4.25 too while I am writing Simple contract I have tried following steps uninstalled Solc: npm uninstall solc Installed targeted v...

Error: Truffle is currently using solc 0.5.16, but one or more of your contracts specify “pragma solidity ^0.8.0” Here is a photo of the error - https://gyazo.com/2f5ea2f50cc1d4ef5eea2f21d0e04fe7 A...

I am trying to pull a list of token contracts held by a wallet address, similar to how bscscan does, except programmatically. bscscan.com/apis does not have an endpoint, and web3js seems to only re...

I try to deploy my masterchef contract. I have 2 arguments to specify in the constructor (the token address and the actual block number in secondes). I use hardhat for doing this and I actually try...

I'm trying to fetch the price of ETH from KyberSwap, using Ethers.js, but I'm receiving the following error: Error: unknown account #0 (operation="getAddress", code=UNSUPPORTED_OPERATION,...

I'm trying to access the ethers provider like this in Nextjs 13.0.1: import { ethers } from "ethers"; export const signMessage = () => { const provider = new ethers.providers.Web3P...

I can't understand what the problem is. When I am run the app I am getting this error: Unhandled Runtime Error Error: invalid address or ENS name (argument="name", value=5.050201689117535...

Web3.js web3 into the window object. Browser Wallets like MetaMask inject ethereum into the window object. In typescript right now to mitigate compile errors I'm casting as follows (window as any)....

I am using MetaMask for sending transactions to contract in my DApp. I need help in How to Disconnect MetaMask account from my DApp when the user clicks on logout button. Front-end: ReactJS Back-en...

I am trying to connect to the metamask from my dapp. following the docs: https://docs.metamask.io/guide/getting-started.html#connecting-to-metamask but when I call eth_requestAccounts method it's o...