Questions tagged [ether]

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

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9answers
18k views

How to get testnet ether?

https://youtu.be/NBwRXpCQta8 I watched this video and followed it. But my account test ether is zero. I used faucet.ma.cx:3000 site too. But test ether is zero.
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1answer
227 views

Transaction dropped. How to increase gas fee?

I sent some ether using Ledger Live, but the gas fee was too low. Id like to increase the gas fee. I was told I can do this via Ledger Etherum Wallet for Chrome. However, when I open Ledger Etherum ...
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0answers
8 views

A Long list of WARNING Messages for Web3 install

I am trying to install web3 on my computer to build an app, and I get a very long list of WARNING messages... can someone tell what they mean? npm notice created a lockfile as package-lock.json. You ...
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0answers
12 views

How to search for the ethereum available token and display?

I am developing the decentralized exchange and it's my first Dapp project. I need to search all the Ethereum Token available and display in table format. On the frontend side, I am using ReactJS. ...
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2answers
140 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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2answers
781 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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2answers
68 views

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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2answers
172 views

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 ...
2
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1answer
155 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
72 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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2answers
35 views

Transfer ether from one account to another using smart contract

I`m trying to transfer ether from account A to a smart contract and from the smart contract to account B. I wrote some code that approximately works on Remix IDE, but I completely got lost with the ...
0
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1answer
42 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
25 views

How to build ERC20 based stablecoin?

I want to build stablecoin for my college project. I am thinking of developing ERC20 token pegged with fiat currency. Can someone please suggest me best tutorials/guides to build stablecoin on ERC20?
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0answers
13 views

uncaught ReferenceError: $ is not defined at index.html:72 “ while loading webpage ”Welcome to escrow dapp" [closed]

I am getting javascript error " uncaught ReferenceError: $ is not defined at index.html:72 " while loading webpage "Welcome to escrow dapp". It points me on this line : $('#contract-form').submit(...
0
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1answer
18 views

Ethereum Boardcast shows error: non-canonical integer (leading zero bytes) for *big.Int, decoding into (types.Transaction)(types.txdata).S"

I meet with a problem, does someone can help me how to deal with leading zero in raw-transaction? My raw transaction is: ...
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2answers
155 views

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
590 views

I need to know how to send ether from one address to another address for my Dapp

I have coded the below code it executes well but the ether cannot be send only the gas fees are sent? pragma solidity ^0.5.2; contract sendEther{ address payable rec= address(...
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1answer
27 views

Problems calling function with web3 from python

I was trying to call a function from my python server to a contract deployed in Ropsten. This is my method in the contract: function send(address receiver, uint amount) public { require(msg....
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1answer
176 views

Pull payment for automatic payment transfer.

How can I program my wallet such that all Ether sent to it is immediately and automatically transferred to my other wallet within a minute.
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1answer
51 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
25 views

Error sending ether to a a smart contract deployed in ropsten with web3 with python

I am trying to send ether to a smart contract deployed on ropsten via infura, but I am having some problems in txn. The error is "Error in Txn: Reverted". The sender account has enought ether to ...
0
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1answer
18 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
94 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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0answers
24 views

Solidity calldata for an array of structs

I'm trying to create the calldata offchain for an on-chain low-level call to a method that accepts an array of structs as an argument. I'm not sure how to encode the calldata for this. Here's a ...
2
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1answer
206 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
74 views

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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2answers
302 views

how get to nonce that need to send in ethereum transaction?

I have written down node js code to send eth using web3. I am getting nonce value using getTransactionCount which is working fine but as all know it can not count pending transaction so if i send ...
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1answer
73 views

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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2answers
35 views

I want the full list of ethereum smart‑contracts whose balances increased by 1000 Ethers above the past week

How to make this kind of query using my 200kb/s second Internet connection speed ? With such speed, there’s no possibility to run an archival node (except maybe with a service allowing to download ...
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1answer
104 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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1answer
172 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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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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1answer
11 views

I want to create a account on blockchain using web3swift in IOS app, but I am new on blockchain don't know how to do. Please can anyone help me out?

I want to create an account on the blockchain using web3swift in the IOS app, but I am new on blockchain don't know how to do it. Please, can anyone help me out?
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1answer
29 views

giving users ETH addresses to deposit to

So I want to allow users to deposit ETH to their accounts in my website. How could i go about giving a user an ETH address to deposit to that address and then detect it and add the funds to user's ...
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1answer
91 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, ...
0
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1answer
25 views

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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2answers
110 views

How to send ETH to address(0) from msg.sender address using multiple token's contracts, with Solidity 5.x?

I need the safest way for an user to send any amount of Ethereum to address(0). The amount is calculated by the contract, and there is no limit (assuming there is enough funds). All the code I could ...
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1answer
199 views

How to connect Trust Wallet in Javascript?

I want to use TrustWallet for payments in my project for mobile users. I saw the documents related to TrustWallet web3 API but not getting how to use it in javascript. Can anybody help me with the ...
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0answers
5 views

Whats the use of utility token if you don't want ICOs for your dapps?

You can mint coins and do your ico to get money. But what if I want an app without any ICO, will utility tokens still useful. Can't all transactions be made with already existing ether or dia stable ...
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1answer
129 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 ...
2
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1answer
97 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
109 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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3answers
171 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
164 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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1answer
190 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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0answers
11 views

How to deploy smart contract with private wallet?

I am now deploying smart contract using ganache localhost:7545, i want to use infura ropsten account to deploy. Most examples uses Metamask, but i want use own ethreum wallet. How can i use to deploy? ...
0
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1answer
111 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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3answers
217 views

understanding value on token transfer transaction

When a token transfer transaction has an ether price associated with it, is it fair to assume that that transaction used ether to buy the tokens? For example, this transacion triggered by account A ...
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1answer
134 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
202 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: "...