Questions tagged [ether]

Ether (ETH) is the main internal crypto-fuel of Ethereum and is used to pay transaction fees.

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Can you store anything other than Eth in one wallet

Total newbie to blockchain. I want to use ethereum to store information and not so much currency. For example, I want to create a game where I can store someones point. Can the wallet address store ...
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1answer
56 views

Passing ether through smart contract logic to address

I'm wanting to pass Ether through some smart contract logic then to some address set in the contract. Is this the possible, or the best way? Or should the ether be passed to contract and the receiver ...
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3answers
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Issuing bonds on Ether

Envisage the following scenario: You are running a business, which requires a float to operate. Your float is x amount of USD This float yields a annual revenue of a XXX amount of USD This float ...
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1answer
40 views

Saving ethers in local private testnet

I created a private ethereum tesnet using geth and it runs well on the system. However, I lose all the ethers in my account everytime I close the application. Is there a way to permanently save the ...
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1answer
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Eth address created from an outdated version of MEW off line

Hello I have MEW off line client 3.7 (2018 version) on an airgapped computer Since the new client doesn't let me create new ethereum wallets offline (it blocks itself (idle) while creating it) can I ...
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3answers
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Auction contract question - Ether lock

I have an auction contract, where bidders bid with Ether then me (owner) select which offer is most suitable and thus this bidder is contract winner. Once the winner is selected, I send him data as a ...
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3answers
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Transfer ETH using third party

I want to transfer ETH from an individual address to another address. So is there any API provider who can send ETH from single Address to another address. Also If I setup Web3 in windows machine ...
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2answers
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Gas price in ETH unit

I am wondering if there's a website that provides the price of the standard gas limit (21000 Gas, transaction cost for sending ETH) in ETH unit. I checked Ether.Fund site, but it provides the gas ...
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0answers
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How to understand supplies from smart contracts

I would like to understand how is total supply calculated and how could I know how much is circulating for particular token. I will just use random token for example https://etherscan.io/address/...
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1answer
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I am trying to add ether to one of my ethereum account using smart contract

function Execution (address _from, address _to) { _from.transfer(price); _to.getBalance(_to) += price; } 1) I think it is duplicate but i gone through but nothing helped 2) I ...
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1answer
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Saving migration to chain.insufficient funds for gas * price + value

It looks like the contract was deployed well on mainnet However, eventually this error occurs Saving migration to chain.insufficient funds for gas * price + value Does it mean that the migration was ...
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1answer
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Metamask TestRPC shows 0 Ether while connecting to Ganache- CLI

I've gone through various Q/A(s) of the problem of ganache-cli and metamask not linking but after trying all the solutions, still doesn't work for me. As soon as I type ganache-cli in windows cmd ...
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MEW says not a valid erc20 token but don't see errors

I created a token prior to this one that is fine. I used the same template, followed the same exact steps to create another token but getting the not valid erc20 error. https://ropsten.etherscan.io/...
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Blochchain Smart Contract App

Actually Im working on a blockchain application based on smart contracts that allows to buy/sell properties and paying in cryptocurrency using Ethereum and Bitcoin. I wonder I develop smart contract ...
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1answer
45 views

Internet on the ethereum network

Excuse this if this is a dumb question. Would the whole internet at some scale be something we can put on the ethereum blockchain?
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1answer
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Web3JS: How to Identify that a given transaction was send with either “ERC Token” or “Ether” in value

I'm working on a Smart Contract and it almost ready. To watch transactions I'm using web2js on my server and its working fine. But from a transaction detail how I get confirm that given transaction ...
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1answer
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Calling a function from another contract is not working. But calling the function from deployed contract is working

I have a problem with calling a function from another contract. I don't know why it is not working. Contract DateTime(https://github.com/pipermerriam/ethereum-datetime) is a util for converting ...
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1answer
216 views

Issues sending Ether with web3j

Hello guys I have search around but no reasonable explanation as to why i would get these exceptions, I have already requested and have 3 ethers with associated with my address. Here is my code for ...
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1answer
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Building a recursive smart contract — is it possible?

I would like to create a sort of tree type hierarchy of contracts. Think of it like a multi-level-marketing scheme -- the person at the top will receive X. For each of the k people he recruits he ...
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Can we avoid the protocol overhead of JSON-RPC and directly connect to GETH through some interface?

I want to build a middleware that adds additional data to JSON RPC responses. This middleware would sit on the same hardware or machine as the GETH node. The traditional approach would be to simply ...
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1answer
31 views

problem with sending ethers on ropsten network

I am trying to send ethers from one address to another address on the ropsten network but I get the message "undefined". Here is my code: web3.eth.getTransactionCount(account1, (error, ...
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2answers
242 views

How to dynamically load contracts data with their ABI from etherscan API?

Im wanting to pull data from a smart contract I've loaded via user address and etherscan API for the ABI. But how would I go about programmatically adding all the functions from the ABI into my ...
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1answer
65 views

Are there any virtual IoT simulators that facilitate the connection with Ethereum Blockchain?

I already built a smart contract for Ethereum Blockchain by using truffle; Now, I'm looking to connect my smart contract with the IoT environment. So are there any IoT simulators (platform, framework,...
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Please look over my contract for re-entrancy

I know the random number generator isn't secure and is susceptible to manipulation from miners and any advice on the method to generate random numbers will be appreciated. However, the reason I'm ...
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1answer
237 views

Programmatically send ERC20 tokens to user wallet. How does transfer work?

I have been researching how to securely send and transfer ERC20 tokens from the contract address to a new user wallet. Tokens will be earned through participation on my platform. Based on results I ...
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1answer
66 views

Several basic question about difference Bitcoin and Ether transactions

Sorry for the easy questions. I was developing tools for Bitcoin and now I want to try and use Ethereum instead. Raw transaction does not contain inputs and outputs, enough balance confirm outside ...
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1answer
82 views

Calculating a minimum entry fee for a game based on typical minimum gas requirements?

I am creating a dApp that is a game where players compete for the prize pool and that pool is built from the sum of all the entry fees payed by the player at the start of the game. The player that ...
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2answers
826 views

Ether Historical Price Data

I am looking for historical ether prices. There was a thread already discussing this enter link description here, however, I would like to get not only the prices available for Ether on Poloniex but ...
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1answer
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How do I get a list of tokens held by an Etehereum address?

TL;DR: wanted: a method that receives an address as a parameter and returns an array of token names/contracts/balances held by address. I'm aware of the fact that Etherscan API has a method allowing ...
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1answer
80 views

Node error when I deployed smart contract - Web3.js

I get this error when I deployed smart contract to my private chain. Error: Node error: {"code":-32000,"message":"unknown account"} This is my web3.js code. const bytecode = "...
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1answer
151 views

Ether balance on Metamask doesn't change after selling tokens

I create a smart contract successfully using Remix IDE , Metamask and Ropsten for testing. I want to sell some tokens using Sell function, so I specified the value "20" for Sell function ,my initial ...
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2answers
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Why the Ropsten test net I created have old transactions?

I created Ropsten testnet account through Metamask. But in Etherscan, it seems that it is already used account, because it has some already made transactions. Why this happens?
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1answer
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What means relay in ethereum?

What is relay in ethereum?For doing transactions, any difference? I am not sure the concept of relay, it looks like one account can pay gas for transaction on another account.
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2answers
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How Does Exchanges Implement Gas Fees for ERC20 Tokens

Any crypto exchange like binance, bitfinex and so on let you deposit and withdraw various ERC20 tokens. Technically I don't understand how they implement gas fees when I withdraw? I deposited 100 ...
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1answer
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How can the contract move funds from a user wallet to a contract address

We are creating a system where every month some ethers shall be transferred from user wallet to a contract wallet. We are focusing on creating a dapp too, so a user will initiate this request and once ...
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1answer
91 views

Not able to send Ether to contract

I am trying to send Ethers to a contract deployed on Ganache but I am getting VM Exception while processing transaction: revert, the same logic is able to transfer Ethers to other account. Following ...
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1answer
26 views

Error: Returned error: VM Exception while processing transaction: revert when using methods.MyMethods.Send

I am writing a simple betting application that will return double the ether deposited by the player, provided they guess correctly the random number generated by the virtual slot machine. it works ...
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4answers
4k views

Getting notified after receiving tokens

Is there any way to get a notification(PN, Email etc.) when one receives ETH or tokens issued on ethereum?
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1answer
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Do I absolutely have to do mining to make transactions done on testnet?

As I know, we don't have to mine to make transactions done in Bitcoin testnet, but in ethereum testnet, we need to mine to make them done. Are there any ways to make them done without mining?
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1answer
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I have a Transaction Hash, how to get the readable Input Data?

i have a Transaction Hash: 0x9f46760404dd3075533e8360fe4beb0ba7210423af1f4a95a5c80defffe824b5, for how do i decode the "input data" easily? for example: https://www.blockchain.com/eth/tx/...
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2answers
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Unknown Accounts suddenly appearing in MetaMask wallet…?

My MetaMask wallet has multiple accounts which I did not create. I have no idea how they there. Is my MetaMask wallet compromised? Or is this normal that MetaMask creates new wallet addresses when ...
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0answers
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My Crowdsale contract wont transfer ERC20 tokens and all transactions fail

I have a crowdsale contract that recieves tokens directly from a mint function in my token contract.the function mints the tokens and sends its to the Crowdsale account address. when I run let token = ...
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1answer
102 views

Testrpc withdraw function does not work

I have a very simple contract with a withdraw function. contract PayTest { function() public payable { } function withdraw() { msg.sender.transfer(4000000000 wei); } } When I try it in the ...
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1answer
58 views

How can I unlock my account

I cannot unlock my account. I decrypted my account from encrypted accoun, and want to unlock it to deploy contract. However, I am getting this error, Node error: {"code":-32000,"message":"could ...
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1answer
69 views

How to build an Ethereum hot wallet for an exchange

I’m developing an exchange. When a new user register on website we will create new eth wallet for them. When they deposit USDT on their wallet how can I transfer that USDT amount to another address (...
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generate large amount of ethereum address with hardware wallet

How to generate large amount of Ethereum address with hardware wallet. Currently Ledger Live only allow to generate one address at a time. If generating thousands of address will take many times to ...
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1answer
213 views

Is smart escrow with ERC20 tokens fit for below scenario?

I am planning for ICO, which provides services. User need to invest some x amount of money to buy token.After buying token their will be a grace period for 10 days to generate revenue and expect ...
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1answer
132 views

Transaction Failed but showing as Pending on Etherscan

So I just started using ether after the same was legalized in my country (India). I use Coinbase Wallet for my Storage of ether. I decided to shift to Metamask from Coinbase Wallet and as such ...
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1answer
236 views

Infura API for mobile(ionic) app

I have one little question. Suppose I have private key of user in ionic app. Is this enough to make transactions using infura API and web3?
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DAO tokens from ether wallet [duplicate]

I just got access to a old ether wallet with all my DAO tokens. Is it too late, no way to convert them back to Ether? any way at all?

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