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Questions tagged [ether]

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

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91 votes
9 answers
119k views

How can I check if an Ethereum address is valid?

I've read many times that you should never input an address by hand unless you want to accidentally send Ether into no-mans-land. I'd like to know what those checksums might be. Is there a way to ...
ZMitton's user avatar
  • 2,780
89 votes
6 answers
172k 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 ...
Tjaden Hess's user avatar
  • 37.2k
79 votes
3 answers
85k views

Is Ethereum wallet address case sensitive?

I sent some amount of ETH to a wallet. I checked the wallets balance on ether chain. I entered the address in the search field and noticed both lowercase and uppercase versions of the address seemed ...
user1035's user avatar
  • 851
76 votes
6 answers
276k views

How do I buy Ethereum with USD?

I am a complete noob at investing. I have never bought stock or invested in anything before but I have $300 I would like to turn into Ethereum. Could someone please tell me step by step how to ...
Noob's user avatar
  • 761
57 votes
4 answers
47k views

The Ether denominations are called Finney, Szabo, and Wei. What/who are these named after?

This was recently asked on Reddit. To expand, who are Finney, Szabo, and Wei, and what did they do/contribute to the project that warranted being awarded denominations?
Tjaden Hess's user avatar
  • 37.2k
50 votes
2 answers
49k views

How do I backup my ether accounts?

I want to backup my accounts onto a USB or other external device for safe-keeping. How can I do that?
Ethan Wilding's user avatar
42 votes
3 answers
34k views

Why is ether divisible to 18 decimal places?

1 ether is 10^18 wei, the smallest denomination. Why does ether have such a high degree of divisibility?
J-B's user avatar
  • 8,961
40 votes
4 answers
165k views

Is CPU mining even worth the Ether?

I would like to start mining Ether, but my GPU isn't the greatest and I don't really want to spend the money on a dedicated rig. Is mining from my CPU (in a Linux environment) still worth the Ether? ...
Donavan Theodor's user avatar
40 votes
2 answers
26k views

How do I convert my The DAO tokens into ethers using the withdrawal contract after the hard fork?

The DAO contract was attacked on 17th June 2016 where the attacker drained about USD 50 million worth of ethers using a recursive call vulnerability in The DAO contract code. The attacker drained ...
BokkyPooBah's user avatar
  • 40.3k
39 votes
6 answers
38k views

How to get ether on public testnet?

I am a newbee to Ethereum and doing some research. I have installed the Ethereum Wallet app and synchronized the testnet. However, to deploy my first contract in testnet, it requires some Ether, so ...
Sanjeev Azad's user avatar
36 votes
8 answers
77k views

Insufficient funds for gas * price + value

Sending Address has over 1 Eth in current Balance. Using the Geth console, I can send many transactions of any amount less than .033 eth.sendTransaction({to:'...
John Heeter's user avatar
28 votes
2 answers
28k views

What is Ethereum's inflation rate? (how quickly will new ether be created)

It seems like the answer is still in flux, but it would be nice to have a single answer to this question that we can update over time.
Brian Armstrong's user avatar
28 votes
1 answer
24k views

How is the Mining Difficulty calculated on Ethereum?

Having read various pieces of documentation, it's still not completely clear to me what dictates the difficulty rise, and how Ethereum difficulty levels differ to Bitcoin. In the past week ...
Ben Vickers's user avatar
27 votes
2 answers
32k views

Ether Historical Prices

I am looking for historical datasets of the price of Ether. Similar to Bitcoin closing market price on blockchain.info or Coindesk OHLC dataset. Datasets in raw form are preferred (.json or .csv). ...
wacax's user avatar
  • 1,378
27 votes
2 answers
46k views

How to convert WEI to ETH with ethers.js

How do you convert WEI to ETH? How do you convert WEI to ETH? How do you convert WEI to ETH? Had to repost because it wouldn't let me post once.
user's user avatar
  • 471
23 votes
2 answers
65k views

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 ...
suburhok's user avatar
  • 401
22 votes
3 answers
4k views

TheDAO hack FAQ: How did the attack happen on 17 June 2016?

Can anyone explain that how the DAO attack happened? Vitalik Buterin explained here that it was performed by splitting a DAO from the main DAO but calling the split function recursively. We know that ...
21 votes
7 answers
48k views

How to get ETH contract balance with Ethers.js

I am trying to get the ETH balance of a contract: const balance = await contract.getBalance(); but it fails: TypeError: contract.getBalance is not a function What I do wrong and how to fix the error?...
porton's user avatar
  • 1,814
21 votes
5 answers
13k views

How do I import my presale wallet?

I purchased ether during the presale. Is there an easy way to import those ether and start using them?
Ethan Wilding's user avatar
21 votes
5 answers
6k views

How to spend ether from multiple accounts?

I would like to know how to send ether from multiple accounts. For example, suppose I have 3 accounts with 5 ether in each account, how do I send the total (15 ether) to an account in a single ...
Paul's user avatar
  • 427
19 votes
2 answers
3k views

What prevents the market from assigning value to testnet ETH?

If enough people mine testnet ETH for testing purposes, difficulty will rise along with the cost of generating testnet coins. In some a circumstance why would the value of testnet coins not rise based ...
cowboy4life's user avatar
18 votes
5 answers
24k views

Is there any Ether mixer / tumbler available?

Quick checking around there are exactly two references to an Ether Mixer - this non functioning and here (r/ethereum) 24 days ago. Unless I am missing something how can I hide the source of an ETH ...
steganographic's user avatar
18 votes
6 answers
37k views

send ethers from one contract to another

I am wondering how can I have ethers in my contract. I have 2 contracts associated with different accounts. I want to send ethers from one contract to another but how do I have ethers in my contract ...
Pawan's user avatar
  • 191
18 votes
1 answer
5k views

Can a contract with no payable function have ether?

The question in the title says it all. To the best of my understanding, the only way to deposit ether into a contract is by calling a payable function, and set msg.value larger than 0 (and of course, ...
goodvibration's user avatar
17 votes
2 answers
5k views

Where does the consumed ether/gas go?

I'm a bit new to ethereum and I'm finding it a bit difficult to understand how gas and Ether relate. So every call we do to a smart contract costs gas. Where does the gas that the user pay goes to? ...
sfrj's user avatar
  • 782
17 votes
5 answers
3k views

How to increase my privacy on Ether accounts?

What would be the best way, if any, that one could change their address/account in order to make themselves unknown or hard to identify by people they traded with? More specifically, if I send ETH to ...
rethsid's user avatar
  • 1,898
17 votes
2 answers
27k views

Does metamask store private key on server or anywhere else?

I have created my private key using myetherwallet using offline option. Now Metamask allows us to import account by providing private key or Json File that has private key. Does metamask store ...
LP13's user avatar
  • 333
16 votes
4 answers
13k views

are there "public" ethereum nodes? or any recommendations on hosting solutions?

I've always ran apps on Heroku. Just developed a smart contract and I need to check the blockchain from the app. Are there public nodes I can connect to to get the info I need to show on my app? If ...
Anto's user avatar
  • 311
16 votes
2 answers
114k views

How fast should be an internet connection to mine ETH?

How fast should be an internet connection to mine ethereum and don't have connection issues? What about ping? And, how many GB of data would get downloaded over a month period? I have a 250GB limit.
Clovis's user avatar
  • 881
16 votes
2 answers
12k views

How do I get a refund for the amount I paid in excess of 1 ether to 100 The DAO tokens

Anyone who bought DAOs in the last two weeks of The DAO crowdfunding phase paid more than 1 ether (ETH) per 100 The DAO tokens (DAO). The ETH amount in excess of 1 ETH per 100 DAOs was stored in The ...
BokkyPooBah's user avatar
  • 40.3k
15 votes
10 answers
25k 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.
SeokRae's user avatar
  • 151
14 votes
4 answers
4k views

Where can I buy Ether?

Where are the best places to buy ether with the least resistance and lowest fees? Is there something like local bitcoin, but for ether?
high110's user avatar
  • 4,756
14 votes
6 answers
17k views

How to create a temporary account for testnet with funds?

I'm a newbie in using the ethereum wallet. After I completely installed and downloaded data for the testnet I create a new account but my new account has nothing (0.00 Eth). It lead to I can't do ...
phuong's user avatar
  • 455
14 votes
2 answers
4k views

Is it possible to send transactions to multiple recipients?

In other blockchain based platforms, it's possible to send transactions to multiple recipients. For instance, if I want to send 13 ETH to Alice and 7 ETH to Bob, Bitcoin has sendmany. Is it possible ...
q9f's user avatar
  • 33k
13 votes
2 answers
15k views

What happens if MyEtherWallet will go offline?

I created a wallet on myEtherWallet. Let's assume that in the future this website doesn't exist anymore. Is there any way to access my ether? Or will they be gone in the blockchain?
rethsid's user avatar
  • 1,898
13 votes
3 answers
2k views

If the supply of Ether is finite, are there any mechanisms to deter hoarding?

The supply of bitcoin is capped at 21 million. The supply of Ether is similarly capped at ~90 million. If we are to assume that Ethereum will become more popular as time progresses, and if we also ...
Richard Horrocks's user avatar
13 votes
4 answers
35k views

How are Ethereum transaction costs calculated?

I'm in the process of learning blockchain technology for a client of mine. I understand the concept of "gas" in computational costs. We are looking at creating a crypto-currency as an alternative ...
Frank John's user avatar
12 votes
4 answers
1k views

What is ether? How is it different from other tokens such as bitcoin?

What is ether? How does it differ from past tokens such as bitcoin and litecoin? What are all the usages of ether?
high110's user avatar
  • 4,756
12 votes
5 answers
27k views

How do I "Buy" tokens on the Rinkeby (test) environment?

This is a noob question I presume. I just started with the Ethereum Wallet. No previous bitcoin experience. I have 0 ether. Can I start "playing" with the test environment ("Rinkeby" network as I ...
gerbil's user avatar
  • 225
12 votes
2 answers
683 views

Can I send gas to another user?

Gas is purchased using Ether, does that mean I can send gas as a separate coin?
Patoshi パトシ's user avatar
11 votes
2 answers
11k views

What is the smallest amount of Ether?

For example, the smallest amount of Bitcoin is one Satoshi or 0.00000001 BTC. What is the smallest amount of Ether and what is it called?
Kyle Piira's user avatar
11 votes
1 answer
13k views

Testing Error thrown with hardhat

How would you test the following function with solidity v0.7 and hardhat v2.3.3? function myFunction(int8 _num) public { require(_num > 5, "Num should be bigger than 5"); ....
ntonnelier's user avatar
11 votes
2 answers
1k views

I bought ether in the presale. Is there a time limit to claim that ether?

There is no mention in the documentation about whether I have to claim ether before a particular date. Is there a time-limit on claiming ether? I've also heard that the mining algorithm will change at ...
Ethan Wilding's user avatar
11 votes
2 answers
2k views

Secure paper wallet creation for ETH using JS

I am about to start the process of transferring my ETH to paper wallets for safe keeping. Currently the funds are stored on an online exchange. History shows that this is a very bad idea. It is not ...
ST2OD's user avatar
  • 213
11 votes
1 answer
2k views

Is it possible to create ICO crowdsale seamlessly accepting multiple assets?

Most of the ICO crowdsales accept ETH only. Some accept BTC. Very few accept other assets. I was thinking about creating crowdsale that would accept as many assets as possible. While creating, ...
Mars Robertson's user avatar
10 votes
4 answers
23k 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 ...
CodingYourLife's user avatar
10 votes
4 answers
16k views

API to gather list of top token holders

I working on a Ethereum project and I would like to gather a list of top X (20 for example) Ethereum accounts. This would behave similar to etherscan.io (https://etherscan.io/accounts) Is there an ...
Rstack's user avatar
  • 103
10 votes
3 answers
2k views

How would stablecoins work on Ethereum?

The idea of a stablecoin in Ethereum is to create a token that is pegged to the price of say $1 USD. What are the main ways of achieving a stable cryptocurrency? What DApps are implementing them and ...
eth's user avatar
  • 86.2k
10 votes
2 answers
13k views

Which Ethereum accounts have the most Ether?

Where can someone get a list of all the ethereum accounts and sort it by the # of ether they have?
Patoshi パトシ's user avatar
10 votes
3 answers
12k views

How to fix "TypeError: Cannot read property 'sendTransaction' of null" when deploying a contract on Ropsten with hardHat?

I am getting this error: TypeError: Cannot read property 'sendTransaction' of null when running this command: $ npx hardhat run scripts/deploy.js --network ropsten with HardHat on Ropsten network. ...
Andrea D_'s user avatar
  • 231

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