Questions tagged [ether]

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

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140 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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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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34 views

Why did cryptokitties congest ethereum network when it has resizable block size?

So I am wondering how come eth network got congested when block size is resizable and it can take more trx if needed? I am reading some info that it can do that but miners don't want to do it as it ...
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1answer
37 views

Token addresses for DAI , USDC and WBTC for IUniswapV2Router02

I have searched a lot but maybe I am looking in the wrong places. Please how can I get the token addresses for USDC , WBTC and DAI that work with Uniswap Router02 on mainnet and kovan. Thanks
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32 views

How can we lock ETH in user wallet without escrow contract?

I know the logic of using an escrow contract in which 2 or more users send their wagered ETH to a smart contract acting as escrow proxy, and then after some decision contract executes we release the ...
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1answer
129 views

How to verify my account in order to use the Kovan testnet?

I am new to parity and kovan-testnet. I have to verify my account in order to receive keth. I am confused as to where to execute the following code: curl http://github-faucet.kovan.network/url --...
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1answer
235 views

ERC20 Token support for metamask website payment

I have the following code working in my site to accept ethereum payments in my website via metamask.... <!DOCTYPE html> <html> <head> <script src="https://cdnjs.cloudflare.com/...
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1answer
45 views

Gas price data from GETH

I am able to get gas price data as follows from some oracles (i.e., ethgasstation.info, etherscan.io): { "fast":50.0, "fastest":200.0, "safeLow":10.0, "average":20.0, "block_time":13....
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3answers
746 views

Deploy the ethereum contract token and transfer to other address using node js web3

Deploy the ethereum contract token and transfer token from one address to other address using node js web3.Anyone please help me.
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Need recovery of original JASON file for 3000 ether

Is it possible to have your original JASON file you were sent in the Pre-sale re-sent. I have the password, but the file was never saved on my hard drive and my emails were deleted. The link was ...
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0answers
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How do I find the amount of Ether the deployed contract on Remix IDE holds?

Assuming I have successfully deployed a contract on the online Remix IDE and sent Ether to the address the contract is deployed to; how do I find the amount of Ether that the contract/address now ...
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Are most ICOs based on Ethereum's Smart Contracts or other technology?

where can I find an overview of the technologies that blockchain startups use? Are most ICOs based on Ethereum's Solidity Smart Contracts, creating a simple ERC20-compatible token? Why are the ...
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How do I store or use private keys in node js that I deploy in live server?

I have a live server running a full GETH NODE in which I need to sign a transaction with a private key. The problem is I dont know how I can use the private key without explicitly providing the ...
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3answers
2k views

Transfer Ether from my wallet to another wallet

I have a wallet at MyEtherWallet.com . Is there any API which allows me to transfer Ether from my account to different accounts ? Does MyEtherWallet provides any such API's ? I saw the documentation, ...
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20 views

Different kind of Wallet/Addresses/Accounts

I have a few questions regarding crypto wallet accounts and currencies. Recently I came across https://www.bitaddress.org/. This website generates bitcoin wallets. Now, when I tried to verify that ...
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1answer
189 views

Transfer a fixed value of ether

pragma solidity ^0.4.19; contract Test { address one; function Test(address _one) public { one = _one; } function send1() public payable { one.transfer(10); } function send2() public ...
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24 views

web3.eth basic functionality

I'm just trying to get web3.eth in node.js to tell me what the current block number is but I get an error 'UnhandledPromiseRejectionWarning: Error: Invalid JSON RPC response: ""', I have &...
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1answer
41 views

blockchain oracles to communicate with external api via smart contracts?

Is there is any other oracles other than provable or oraclize to communicate with external api via smart contract.
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217 views

how to watch the eth address with infura

our project now uses scheduled task to query the eth address with infura API to get its balance every 10 seconds but as the number of addresses keep increasing, the efficiency is very bad. Is there ...
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1answer
111 views

Problems funding Ethereum Wallet

Tried making three separate transactions from two separate wallets (Coinme and Coinbase) each in relatively small amounts (less than $50) to fund my Ethereum Wallet 8.0 for Mac. None have appeared ...
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2answers
185 views

How to calculate the token price of already deployed ERC20 tokens

I am creating a smart contract, so inside that I have to pass the token in contract and the value of ether will be calculate on behalf of token price please help.
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1answer
41 views

receive ether from address only after another address has sent ether

I have a two smart contracts. One receives ether(ReceiveEther) and the other sends ether(SendEther). I have it set so whoever made SendEther can only send to ReceiveEther if both contract creators ...
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3answers
2k views

Difference between Javascript VM vs injected w3 vs web3 provider

It is related to remix ethereum browser. I am wondering what is the difference between them. I think Javascript VM is just test network environment where you do not need any ethereum to test. How ...
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1answer
114 views

Use ENS with MyEtherWallet.com

When starting an auction for an .eth address on MyEtherWallet.com am I automatically placing a bid on the address or do I have to manually place a bid afterwards (and pay 0.01 ETH AGAIN)?
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376 views

The use of ERC20 tokens in a private ethereum network

I am being told to use a private blockchain instead of the public one in attempt to cut gas cost. But I was hit with the problem of the value of ether and tokens in this private blockchain. I am ...
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1answer
158 views

Unable to send ether to account

I am trying to send ehter using this code web3.eth.accounts.wallet.add(privateKey); web3.eth.sendTransaction({ to:someAddress, from:onwer, value:amount*1, ...
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1answer
157 views

How can i watch multiple smart contracts on server

I would like to create a sever that continuously watch the events of multiple smart contract at once. Sending me an alert via email when an event is detected. I understand that there is a web3.js ...
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1answer
142 views

How to make an ETH transfer from a contract that appears as an ETH transaction on the destination address?

I'm learning Solidity, and I've created a very basic contract that sends Ether from the contract to another address. My contract works, and ETH is being transfered (I'm on Rinkeby). ETH is subtracted ...
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1answer
98 views

install ethereum wallet on local computer

I want to be able to transfer ether from an online exchange to a private wallet on my local computer. How can I install a safe standard wallet? Do I need to install ethereum blockchain first? If so, ...
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1answer
104 views

Watching the transaction of an external account using smart contract

Is their any way to execute a function of smart contract whenever a transaction to a predefined external account occurs? I mean if someone transfers some ethers to account A, a function of a smart ...
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1answer
200 views

How can I use the fallback function to accept a payment?

I can't quite find the answer I'm looking for. The gas limit for the fallback function is 2300. Whether I call another method or set a variable, I blow WAY past the 2300 limit, rendering it ...
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2answers
1k views

how can i find the contract name from the address using the etherscan API?

I have the address but I want to know the name of contract. Is there any way to get that from the etherscan API?
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1answer
37 views

Latest block number and its transactions from etherchain.org

I am trying to get the latest block information such as latest block number and all its transactions details such as Tx hash, gas price, gas used, timestamp etc., from etherchain.org. I know Etherscan ...
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33 views

Need to access ether with my private key

I had a small amount of ether stored in a wallet i downloaded from the appstore (on android). Unfortunately my phone broke and now I cant find the same app on the store anymore. I tried finding the ...
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Ether transaction does not reflect in ganache

Hi am developing a etherium DAPP. In that for every user registration some ether will get transfer from user to contract... Everything work perfect but the transacted ether is not reflecting in ...
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3answers
255 views

Error when trying to add a payable function in erc20

Most of the ERC20 examples on the internet have this function: // ------------------------------------------------------------------------ // Don't accept ETH // --------------------------------------...
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1answer
138 views

Transfer of funds from etherli to poloniex

I can not make the ethereum transfer from the etherli wallet to my poloniex wallet. The message is: "Please fund your user account with sufficient ether (~0.01 ETH / tx) for gas (transaction fees)" ...
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234 views

Ganache not working

I am developing on a testnet on ganache and using remix. I am working with web3 and working on the user interface. when trying to fetch a function with web3/ganache, I get the following error: "...
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1answer
653 views

Generate addresses using xpub

I have a cold storage where I installed BTC-Electrum and LTC-Electrum wallets. So I have took extended master public keys and have generating addresses in my online service. Now I want to generate ...
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1answer
36 views

ParserError: Expected primary expression - address payable - payable()

I'm trying to get myself familiarized with ethereum. So I was going through a repo, and tried to rum the code : function transferFundOnResolve(uint cid) private { // Could also be used: ...
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1answer
162 views

Unable to change contract data with nodejs (web3)

I created a contract, and deployed it into my private blockchain, as you can see I use mapping and dynamically allocated array. When I am trying to add a domain by 'addDomain' method with remix web ...
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20 views

Ethereum token transaction taking too much time to confirm [duplicate]

I was transacting an ethereum token CRO crypto coin out of wallet. There was 3 fees options. I chose fees for slow transaction time. And it told the transaction should confirm in 30 minutes. But now ...
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31 views

Ethereum transaction with multi input and multi output like bitcoin

What happens to my wallet when I only 1000 accounts with 0.0001 ether and the tx-fee is about the same, I can't spend anything anymore?
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2answers
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What is the point of transaction fees if new ETH is generated as a mining reward?

I don't understand. What is the point of transaction fees if new ETH is generated as a mining reward?
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26 views

ethers formatEther(wei) with max 4 decimal places

I want to display a human readable balance with less decimal places like metamask does it. The function formatEther(wei) returns a string, so for proper rounding I need to parse it etc. And I wanted ...
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1answer
30 views

ParserError: Expected identifier, got 'LParen' in Remix simple auction using Solidity

The line highlighted in the error is require(bid2 > highestBid2); The code: pragma solidity ^0.4.22; contract SimpleAuction { address public beneficiary; uint public auctionEnd; ...
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2answers
812 views

How to convert transaction's inputs to readable values?

I've got the following transaction's input: { name: 'trade', types: [ 'address', 'uint256', 'address', 'uint256', 'uint256', 'uint256', ...
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67 views

While testing wrap & unwrap of ETH to WETH on Kovan ,however the wrap function is fine but unwrap func fails,is anything wrong in my approach?

trx fails at & debug at tenderly pragma solidity 0.5.12; contract WETH9_ { mapping (address => uint) public balanceOf; mapping (address => mapping (address => ...
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what is parent transaction in ethereum

I am learning about ethereum, when I learn I came across a term Parent transaction Hash I would like to know regarding this

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