72 votes

How do I buy Ethereum with USD?

Hello and welcome to Ethereum! I don't know how this comment became the de-facto guide, but it's really not the best as it doesn't have any pictures and doesn't introduce you to Ethereum properly. ...
  • 15.3k
19 votes

How to programmatically detect and accept ETH and ERC20 deposits

It'd probably go something like this: User wants to deposit a token to your exchange If it's the first time the user is depositing that token then this occurs: Generate a new wallet key/pair on the ...
  • 4,855
14 votes
Accepted

Why are smart contract outputs different from ordinary transactions?

Here's an intuition. The simplest transaction in Ethereum costs 21000 gas and looks like this: {from: '0x from', to: '0x to', value: web3.toWei(1, "ether")} When you're depositing to the exchange, ...
  • 79.8k
14 votes

What is the difference between an exchange like Coinbase and a wallet like Jaxx, MEW, MetaMask?

Your ETH & tokens are on the blockchain, regardless of what service you use to access them. When you move them, you are sending them from one address on the blockchain to another. These are simply ...
  • 15.3k
12 votes

How do I buy Ethereum with USD?

One way to do it is, you can use coinbase.com to buy Bitcoin and convert the BTC to ETH through shapeshift.io. Also there is kraken.com, they claims to be the best Bitcoin Exchange. The best ...
  • 9,433
12 votes
Accepted

Can ethereum really make a safe decentralized exchange?

EDIT: Uniswap has proven to be a safe, decentralized exchange and has been operating since November 2018. Also see What is it that's really decentralized in DEX-es? ORIGINAL ANSWER Yes, an open-...
  • 79.8k
11 votes
Accepted

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

If you refer to something like Demurrage in Freicoin, then the answer is probably no - there was no special design to discourage hoarding of Ether. Also, the argument that such deterrent is required ...
11 votes
Accepted

How many exchanges have delisted ETH as a result of the proposed post DAO hack Ethereum hardfork?

According to the long list of Ethereum exchanges found here: https://coinmarketcap.com/currencies/ethereum/#markets Cryptopia appears to be the only one that has announced that it will remove ...
  • 368
11 votes
Accepted

Is it secure to read USD / ETH rate from exchanges directly without using price oracles?

TL;DR: It is not secure to read pricing information from an exchange or other protocol. Always use a decentralized oracle. You're setting yourself up to be hacked when building smart contracts. ...
9 votes

How do I buy Ethereum with USD?

You should try kraken.com there are markets directly in ETH/USD or ETH/EUR and you can pay by credit card. It's also a very well known and reputable exchange. But aware that it takes you a little ...
  • 2,272
9 votes
Accepted

Can I sell a portion of my DAO tokens on a market place?

After the creation period ends on May 28th, you will be able to send DAO Tokens, similar to how you send ETH. You can send your entire amount of DAO Tokens or just a portion of them. It should be ...
  • 15.3k
9 votes
Accepted

Are funds returned if one transfers from an exchange to an invalid Ethereum address?

Depends on "how" invalid it is. If you send ether to a public address that does not exist (i.e. nobody has the private key for), assuming that the format of the address is correct (hex, correct ...
  • 3,440
8 votes
Accepted

What does "resistance" mean in the context of a cryptocurrency exchange?

When buying ether, "resistance" is a measure of factors such as: do you need to have a credit card do you need to have some other cryptocurrency to make the payment do you need to provide your ...
  • 79.8k
8 votes
Accepted

Where can I buy Ether?

The closest to localbitcoin maybe Ethereum meetups. Depending on your location it could be easy and lowest fees, as the community is young and wants you to try things out. Shapeshift.io is currently ...
  • 79.8k
8 votes

Sent ether from wallet to bittrex, 12 hours later no balance on bittrex

The first thing to check is whether the transaction shows up on a ether block explorer. Enter your bittrex deposit address in the search field in https://etherchain.org . If you see a balance,it may ...
8 votes

Coinbase and Kraken Transfer Costs

I see what happened. 1ETH was transferred: from 0x2bF0011e4da5a841CE9459c0995Bb2646c4f1D21 (coinbase) to 0xd08436533f63b1342fB89198F963acD8589657AE (intermediary address) with a gas cost of (21000 * ...
  • 1,257
8 votes
Accepted

How to build an Ethereum hot wallet for an exchange

The most Ethereum friendly solution would be Create and deploy a controller smart contract. This co-ordinates that we have deterministic addresses for payment forwarded smart contracts. For each new ...
7 votes
Accepted

Why do token transfers sent to the Binance wallet cost very little gas?

My guess is that these transactions resulted in a zero token balance for the sender and started with a non-zero balance for the recipient. When you store a value, the gas cost varies: It costs 20,000 ...
  • 26.9k
6 votes

Where can I buy Ether?

Lowest Resistance: shapeshift.io Highest Volume: Poloniex or Kraken
  • 34.8k
6 votes

Is it safe to keep Ether on an exchanges during the Homestead switchover?

Given the sordid history of exchanges in the crypto world to-date, it is not advisable to hold large sums with them. That said, the homestead update itself shouldn't make any difference.
6 votes

How do I transfer funds from an exchange to a wallet I control?

Kraken Log in to your Kraken account. Click on the "Funding Tab" and then "Withdraw" and then at the bottom, "Ether (ETH)" Click the "+ Add address" button. ...
6 votes
Accepted

Which exchange should I trust to provide ether price in USD?

From where these exchanges get the current market price of ether? The price is dependent on what users are currently valuing ether at. The exchanges don't set the prices, nor get them from anywhere ...
6 votes

ICO crypto-currencies accepted during the sale: ETH, BTC, or even fiat?

Yes, ethereum smart contract can only accept ether. So if one wants to use Bitcoin to buy ethereum tokens, then you need to do something to let it happen. I have seen different approaches to this ...
6 votes
Accepted

What is DeFi decentralized finance?

Decentralized Finance (DeFi) is the movement that leverages decentralized networks to transform old financial products into trustless and transparent protocols that run without intermediaries. Some ...
6 votes

Get Uniswap Exchange Rate of any Token with Web3

There is a more simple solution to pull the price straight from Blockchain the steps are as follow: Using the router contract call getAmountsOut(1.0, [token, WETH]) Using the router contract call ...
5 votes
Accepted

What is the difference between ICAP and HEX addresses?

Briefly, ICAP addresses are safer to use, since they have a checksum which provides protection against mistyping an address. But ICAP adoption isn't as widespread currently. For mining you can use ...
  • 79.8k
5 votes
Accepted

From a technical perspective, is MultiSigna a decentralized exchange utilizing ethereum?

From their description, MultiSigna is not a decentralised exchange. Their primary feature is the use of Bitcoin (not Ethereum) multi-signature feature. Bitcoins are put in an escrow from which they ...
5 votes

What does "resistance" mean in the context of a cryptocurrency exchange?

For example, currently, the least resistant method may be the following: 1) Attend ethereum meet up;and 2) Purchase from a trusted seller in person with cash. If you're not able to meet someone in ...
  • 4,636
5 votes
Accepted

Can I withdraw Ether from exchanges to a contract wallet?

The issue is that it requires more gas (i.e. Higher transaction fee) than for sending to an account. Most likely the exchanges wallet is not providing enough gas when it makes the transaction so it ...
  • 1,884
5 votes
Accepted

How does EtherDelta work?

In this high level overview, the Etherboost team which is behind EtherDelta wrote: The EtherDelta smart contract allows you to deposit or withdraw Ether or any ERC-20 Ethereum token. If you go to ...
  • 2,259

Only top scored, non community-wiki answers of a minimum length are eligible