Questions tagged [ether]

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

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1answer
36 views

CLI wallet where I can pass in a Private Key and send out ETH and then delete this key?

Is there a CLI command where I can pass in an ethereum private key and send some coins to another address? I'm trying to build out a reoccurring payment system where a user can send 1 eth to another ...
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1answer
39 views

I am using already deployed tokens in my contract

My question is if I'm not implementing ERC-20 methods in my contract, but I'm using already deployed ERC-20 contract methods in my contract, so can we say this will be ERC-20 compliant contract? ...
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1answer
16 views

Trying to get a wallet at Myetherwallet

I went on the site, got my Keystore file number and my Private Key number but I cant figure how to get my address? Tryed for hrs.
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1answer
140 views

Why does Ropsten faucet show “Your account is grey listed for 0 hours and 0 minutes”?

I am requesting test ether from a Ropsten faucet, but it is showing an error. Please help me to resolve this error.
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3answers
529 views

HI, can i get live Ether to USD price in my smart Contract ? I want to keep a hardcap in USD. is it possible to do so?

I want to make a function for my ICO to calculate ethers collected so far and convert them into USDollars. I wanted to hard cap my ICO in USDollars. Is it possible to do so ? I am using Solidity to ...
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1answer
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Needs some helps in graphic cars

what's the super graphic card is a very suitable for the mining etheium and what is the exact CPU that suits it wuth RAM.
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0answers
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Hourly data for Ethereum?

Is there any reliable source for hourly data for Ethereum dating back to 2017? The poloniex API only provides me with daily data - https://poloniex.com/public?command=returnChartData&currencyPair=...
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4answers
3k views
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2answers
142 views

What is the max ethereum allowed in a private network for the whole network?

When I build a private chain setup, what is the maximum Geth ethereum I can have for the life of the network. Another way of asking the question would be: What is the maximum ethereum one account can ...
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2answers
46 views

Internal contract-to-contract call

I am confused with the following sentence in the Solidity documentation: During the execution of the fallback function, the contract can only rely on the “gas stipend” it is passed (2300 gas) being ...
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9answers
19k 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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0answers
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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
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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
296 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 ...
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1answer
238 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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1answer
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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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1answer
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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
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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
51 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 ...
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0answers
103 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 ...
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1answer
47 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
88 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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2answers
174 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
441 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
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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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0answers
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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? ...
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1answer
409 views

How to use the zksnarks capability of Ethereum?

Simple question but I couldn’t find the answer anywhere… How to use the zksnarks capability of Ethereum in order to perform fully Anonymous sending of Eter from one wallet to an other one ?
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1answer
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Can i recover ethereum sent to and invalid address? [duplicate]

i've mistakenly pasted "2.5" in address field submitted a withdrawal request. can i get my coins back since the address is an invalid or the coin will be sent? I'm afraid i may loose my coins.
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0answers
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Web3 - cannot deploy contract to private chain has been reverted [duplicate]

I want to deploy a contract to my private chain by using web3.js, but my contract deployment has been reverted by the EVM. This is error message index.js:1437 Error: Transaction has been reverted ...
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2answers
174 views

Exchange ERC20 token with other ERC20 token

I have 2 ERC20 tokens. The contract are designed as standard ERC20. Here are the 2 tokens to take as an example - AUDC --> Contract Address: (0xContractAUDC) Wallet Address: (...
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1answer
32 views

Can a single token built on Ethereum’s blockchain be more valuable than Ethereum itself?

As in the question, from an economics point of view, is it possible to ever have a single token (REP/BAT or something completely unforeseen currently) takeover the underlying's platform market cap or ...
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0answers
18 views

Avoid upfront cost for calling own faucet?

To onboard users to a project quickly, I want to build my own little Rinkeby-faucet where users with new accounts (0 ETH) can get a bit of ETH by clicking a button. However, just calling the ...
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0answers
23 views

PGP Key in Funding Application [closed]

I am looking to get funding from the ECF Network for an Ethereum project. They ask for a PGP key under the apply form ("Please make sure you paste your pgp public key here: ", but nowhere on their ...
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1answer
110 views

Create2 and new contract deploy at used address

Given that it seems possible, using somehow CREATE2, to deploy a new smart contract at a certain address where a different smart contract existed before to be killed... (see @smarx answer here Can ...
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1answer
110 views

How to solve the error “”before all“ hook: prepare suite:” [closed]

When I tested my contract, I got this error ""before all" hook: prepare suite:" Does anyone know how to solve this error? This is my dependencies. "truffle": "5.0.7", "web3": "1.0.0-beta.46"
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0answers
31 views

Inconsistent responses with 'eth_getTransactionByHash' through RPC API. Can anyone help?

I have been using the requests library with python to query the geth/rpc api in order to get ETH transaction data. I connected to geth via "geth --rpc --unlock TESTINGADDRESSWITHNOVALUE --allow-...
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2answers
506 views

Ethereum Qr-code with amount?

How should a qr-code be formated with an amount in it? The npm package ethereum-qr-code uses the following format according to EIP-67: ethereum:0x7cB57B5A97eAbe94205C07890BE4c1aD31E486A8?gas=42000&...
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3answers
8k views

How to view custom token balance in ether wallet using web3

Hello I am newbie to cryptocurrency. I have created my erc20 custom token. Now, I want to create an API to view the balance(in my token as well as in ethers) using web3 and node js.Can someone please ...
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2answers
517 views

Transaction stuck in “Pending”

I've sent some ETH from the Ledger Live app to an exchange but I only used 1 Gwei and now the transaction is pending. It's been 20 hours. Will the transaction run out of gas eventually or will it go ...
2
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1answer
695 views

Remix is compiling the smart contract but not solc command

I am able to successfully compile a smart contract in remix IDE. However when I try to do the same with solc npm command, it shows a JSON error when compiling. Voting.sol pragma solidity ^0.4.25; ...
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2answers
19k views

Is there a way to mine Ether on a Mac?

All I see is Windows and Linux support only, why is there no guide for mining ether on a Mac? Is there a way to mine on a Mac?
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6answers
161k views

What is the total supply of Ether?

In Bitcoin, the total supply is capped at 21 million BTC. Is the total supply of Ether capped? How much will be mined before the Proof of Stake (POS) transition, and how will POS affect the issuance ...
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1answer
475 views

Myetherwallet Insufficient balance for transactionGas limit set dangerously high. Approving this transaction is likely to fail

I'm trying to buy a cripto kittie that costs 0.0035 ETH which is around 3.14 dollars. I'm using my ether wallet for the transaction and when I set up the Gas Limit I get the following error on ...
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0answers
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Can we treat/launch private ethereum chain ethers as a CryptoCurrency in Market?

Warm Greetings! I have a private ethereum blockchain setup on my server with multiple nodes , Also running mining software to mine blocks and earning private ethers (no value in market). Can i ...
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0answers
40 views

Can not tranfer eth with solidity and web3js

Error when I try to send eth from fontend react to smart contract and from contract I tranfer eth to another address but it error, when I try it in remix then it total work. I user web3js to call ...
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3answers
620 views

How do I make a smart contract send a message to a user along with a transaction?

Smart contracts can obviously send transactions through the Ethereum network but can they also send a simple message along with the transaction? Usaully you would put the message into hex code in the ...
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1answer
722 views

How to get multiple values from one function contract to another

I have two contract and in first contract it contains a function which is responsible for returning two values, one of string and one of integer. function getUserData(address userAddress) public ...
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1answer
58 views

How big is the Geth Fast Node Currently?

I am trying to embark on getting all the contract addresses pulled from the Ethereum blockchain. From what I read, a fast node is all that is required for this (getting blocks->txns->contractAddress ...
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1answer
34 views

How to reach to one chain when hard fork is performed?

Assume that reward policy of Ethereum is changed from 3eth to 1eth. Hard fork is ongoing but, there are miners who don't consider updating their software. what happens? The miner who did update ...
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2answers
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Get All Contracts from Blockchain

I am developing a large database of exploitable contract addresses and creating a website to host such a database for users to use to see if contracts are safe. Is there a way to get all contract ...

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