Questions tagged [exchanges]

places to trade ether with other currencies or assets

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19 views

Where to Purchase Ether as a Business [closed]

I have a business that uses ETH to facilitate transactions. We are NOT an institutional investor and are therefore using ETH as a currency, not an investment. Any thoughts on the easiest way to get ...
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Uniswap V1: Why does EthToTokenInput not refund overpaid ether?

ethToTokenInput on the Uniswap V1 contract converts all the sent ether to tokens and transfers the tokens to the recipient. Lets assume 1 ether buys you 3.9 tokens according to getInputPrice(). If ...
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The only way to obtain ether is generate the ether?

Hello i have a question : The only way to get ether is buying to another user has mining the ether ? let me explain my question, i know i can use coinbase or another websites to buy ether, but where ...
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1answer
84 views

How to obtain Rinkeby DAI?

I need to obtain Rinkeby DAI token with this token address: 0x8f2e097e79b1c51be9cba42658862f0192c3e487 I tried a faucet and https://rinkeby.uniswap.exchange/swap - both give me a different token (...
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1answer
22 views

How do exchanges work internally?

Because EVM cannot watch events, we cannot send a token to an exchange and immediately get back some other token (EVM just does not "know" when it was send a token). As far as I understand, this is ...
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1answer
55 views

How to create a token exchange for private blockchain?

I have requirement to create a exchange for my private blockchain tokens, where registered user can buy and sell tokens, and token price goes up and down on demand and supply. I have searched bit, ...
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1answer
56 views

Can an Erc-20 token that I create on my Quorum be integrated with any cryptocurrency exchange (for example Coinbase)?

I have setup my own quorum blockchain network. If I deploy an ERC20 token contract with a coin name (say ABC), will I be able to list the coin in exchanges ?
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1answer
40 views

Generating multiple deposite address for one account

I want to create something like a Crypto exchange, in which I need to generate different unique deposit addresses for each user, so they can send funds to their accounts while I can keep track of how ...
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20 views

How to trace transactions to get information about hot and cold wallets?

I am researching ways how to trace transactions to get data about hot and cold wallets of exchanges, gambling sites, cantors, mixers. What sources of data could I use? What algorithms and scripts ...
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8 views

Where can I get list of tokens that allow direct conversion to ether and not just from token to token?

Most tokens simply utilize the ERC20 functions transferfrom/transferto which just use some balances to add from one user to another - but what are the ones who allow you to: buy token cashout to ...
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1answer
60 views

Do I need ETH in my exchange account to send out ERC-20 tokens to an external wallet?

I'm new into ERC-20 tokens. Let's say I buy an ERC-20 token in an exchange with USD. When I want to transfer that token to my own external wallet (say Nano S), do I need some ETH in the exchange (...
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1answer
17 views

How to get exchange rates for testnets?

I would like to see what a PETH on Kovan is worth in DAI. How can you look for exchange rates on testnets?
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1answer
349 views

What is DeFi decentralized finance?

What is DeFi? What are its core components? How to think about or picture "it"? Some of the parts are tokens, stablecoins (tokens with specific properties to reduce its volatility), and exchanges, ...
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2answers
347 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 ...
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1answer
67 views

Ethereum Contract Scalability (Single vs Multiple Contracts)

I am writing a token swap contract on Ethereum Blockchain to manage ERC 20 token swap in an exchange. The Questions is that in terms of scalability, which of the following two options would be better ...
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2answers
553 views

How to set and get marketprice of token in contract? [closed]

I am building a simple erc-20 token. I don't have an idea as how token price is setup. However, I need to get my token's market price inside another contract. If you see this example of token BOMB, it ...
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1answer
46 views

Launch ERC20 token [duplicate]

I have implemented the ERC20 interface and the token is ready. Next step is to list it on an exchange like kraken. What is the process ? What determines the initial value of a custom token ? What will ...
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3answers
110 views

Decentralized Exchange on Ethereum?

Is a decentralized exchange basically a smart contract that includes all the exchange functionality? Where is the engine?
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2answers
119 views

Token with whitelisting on crypto exchange

we are planing to implement a ERC-20 token with whitelisting (only whitelisted addressees, can trade tokens). And we are planing to list this token on some exchanges. Is this possible? What must be ...
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2answers
24 views

Create token exchange by defining decimal values

I've just learned a lot about Solidity and decided to put it into practice. Something I truly don't understand is how I can bypass the limitations of this programming language. Assume the following ...
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1answer
137 views

Which exchanges are currently the best and easiest to list ERC-20 tokens on?

Which exchanges are currently the best and easiest to list ERC-20 tokens on? Hello, I am issuing ERC-20 tokens at the moment. Which exchanges are the best and easiest to list tokens on at the ...
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1answer
65 views

ERC20 exchange support [closed]

how can you add support for erc20 tokens on your own exchange, so that users can perform transactions between themselves? There are many services that make it possible to work with BTC and ETH, but ...
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1answer
55 views

ERC20 Token management in a CEX

Imagine I create a new account on lets say KuCoin. I create a ether/erc20 address and I send an amount in ERC20 tokens to that address. KuCoin then sends that to their mainwallet. How do they do ...
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1answer
80 views

Smart Contract Tokens and exchanges?

Is there any special code you need so your token can be traded on exchanges example Binance? Right now its a pretty basic contact like Fixed Supply token. Or is it as long as the exchange(...
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1answer
21 views

Will there be an Ethereum Constantinople Fork coin and which exchanges would be supporting it?

There are reports of nodes that still haven't upgraded their Ethereum nodes and they are on the Ethereum Constantinople fork. Would a new coin exist and which exchanges have shown support for ...
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2answers
215 views

Constantinople hard fork and Ethereum based tokens

I have a question: Do we have to deposit all of our Ethereum tokens into some exchange before the Constantinople hard fork, otherwise our tokens will become worthless? Or we can leave our tokens in ...
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1answer
44 views

Just in time conversion to ETH in dApp

Let's say I want to facilitate transactions between two parties, and if there is one user who gives payment information, such as their bank account in USD, I'd like to exchange that into ETH ...
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1answer
21 views

Can solidity alone suitable for ICO project?

I know solidity codes and coded one smart contract.I want to know is if I want to list this contract on one exchange.is it ok or not. can this exchange accept this codes to exchange with other coins?
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1answer
32 views

Can ERC20 tokens be traded on other blockchain based decentralized exchange?

I have a quick question to ask from you. can we trade erc20 tokens on decentralized exchange which is built on custom replica of ethereum blockchain or you can say on a fork of ethereum blockchain. ...
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3answers
264 views

Is there any decentralized exchange with zero trading fees for ERC-20 tokens at the moment?

Is there any decentralized exchange with zero trading fees for ERC-20 tokens at the moment? All fees except gas fees should be zero. I already tried Bancor and Kyber but, as far as I can tell, they ...
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1answer
258 views

Generate random address for ERC20 Token deposit and consolidation?

I'm trying to implement a mechanism to generate random addresses for users to deposit ERC20 tokens and then consolidate the deposited tokens to a cold wallet address later, somewhat like what an ...
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1answer
80 views

List of Token Exchanges Available on Testing Network?

Found Kyber Network Token Exchange on Ropsten so far. Please share if you know more token exchanges available on any testing network for trading Tokens as a test.
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1answer
27 views

How to prevent a token from being exchanged freely

Let's say that I have created a token and this is distributed through a smart contract. Let's assume that this token is not on any exchange and whenever a transaction is executed using this token a ...
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1answer
63 views

copy etherdelta code [closed]

For a test project, I need to write the etherdelta's contract. but "function EtherDelta (address admin_, address feeAccount_, address accountLevelsAddr_, uint feeMake_, uint feeTake_, uint feeRebate_) ...
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1answer
99 views

How to use Ethereum as a database for an order book? [closed]

I hope this question is not too general. I would like to have a few opinions. What is the best way to work with data in Ethereum? Lets say we build a decentralized exchange on a small scale. How ...
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2answers
472 views

How does token exchange buy and sell ERC20 tokens technically?

I am new and self studying how ERC20 token and smart contract works. After reading through some documents and blogs about creating token and ICO smart contracts. I have questions about how people ...
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1answer
501 views

How do exchanges transfer tokens from user wallets?

​ I am wondering how exchanged like Binance are able to transfer out tokens from user wallets that have no ETH in them? ​ For example if I create a new binance account and say I transfer ADA from ...
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1answer
451 views

What determines the price of the ERC-20 token on a trading exchange?

I know that ERC-20 tokens are traded in pairs on the trading exchanges, but what essentially determines the price in USD? I would like to know if there's a specific algorithm that does the calculation....
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how do you handle token value data type in database?

Ones who do exchange / Investment platforms development, all ERC20 tokens has its atomic unit and only moved by specifying value in its atomic form. for eg: 1 BuritoToken with unit decimals as 18, ...
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1answer
18 views

ETH transfer help

Hi I have opened my first coin wallet - metamask. I have bought ETH through here and now tried to send to Binance to buy BAT. I just wondered how long it usually takes to transfer ETH as it seems to ...
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529 views

Error: VM Exception while processing transaction: revert due to require statement

I am new to ethereum world and trying to get some practise through my MSc Project. I am attempting to create an ethereum application for trading electricity. The contracts are the following: pragma ...
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1answer
629 views

Cannot send ERC20 tokens because user has no ethereum

I have 1 wallet server but have many account address for each user, so when user want to transfer erc-20 token say OMG to another address(user) in the same wallet server, the system said can not ...
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45 views

Persons who successfully placed tokens on public exchange: did you shared source code of contract?

One of my clients created token (standard ERC20) and want to put it to public exchange site. Exchange policy requires reference to Github repository. Client asking whether it safe to share source code ...
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187 views

ERC223, drawbacks and exchanges still not supporting it? Should I just use HasNoTokens?

I know it has been discussed many times and in many articles on ERC223, for replacing ERC20. We are launching our tokens and hopefully ICO soon too, it seems that we should go for ERC223, since more ...
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1answer
72 views

Creating a token order book without costing gas

I'm building a DApp for ERC721 collectibles. I want to make it more like rarepepewallet.com than CryptoKitties: RarePepeWallet has an order book for each token, matching asks with bids, just like any ...
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169 views

can ERC20 token implements private transfers functions

I know Golem Network Token is not implementing the approve() allowance() and transferFrom() functions. Thus, GNT is partially compliant to ERC20 standard. I would like to go futher, and implement the ...
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1answer
95 views

ERC20 with custom sale mechanisms?

Let's say I want to create a token, but I don't want this token to be exchanged too freely, in order to avoid too much of speculation (real estate for example). People willing to sell the asset will ...
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1answer
30 views

smart contract and just buying ETH [closed]

I bought ETH from Coinmama against USD and wanted it to be sent to Huobi exchange 3 hours late - ETH still has not hit the exchange. Huobi are saying they are ETH smart contracts and they cant accept ...
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199 views

How to sell token using web3

Sorry if this has been asked , I can't find solution . What I want to achieve is having token that users can buy and sell (price taken from contract ).I have used web3 before for sending transactions ...
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126 views

How to push reserved tokens to market after ICO

I have written a contract where 50% tokens are in reserve and owner wants to sale those tokens via Exchange. Should I add BUY function in contract to achieve this feature. function buy() payable ...