Questions tagged [exchanges]

places to trade ether with other currencies or assets

44 questions with no upvoted or accepted answers
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Is it worth to store Ether at the full precision in database?

Ether has precision of 10^18 which makes it impossible to use BIGINT type in database to store values in weis: DECIMAL type should be used instead. Is it worth to store values in Gwei to stay with ...
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1answer
114 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 ...
2
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1answer
68 views

How does the large-scale crypto trade platform , just like Binance or Bittrex , track ETH and Token transfer in their every account over time?

I wrote some simple code with web3js to track an address/account's transaction in real-time. It works, but I think it is in poor performance or could consume too much cpu resources. sample code ...
2
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0answers
121 views

Tracking orders on 0x network

How are the various 0x network order trackers sourcing on-chain settlement data? My first assumption was that they were utilising the Etherscan API, however Etherscan have their own tracker, found at ...
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199 views

Are there any exchanges like Shapeshift for testing and development?

I'm developing a simple application which involves calling Shapeshift, Bitfinex and similar exchange APIs. They do not provide any sandboxed or under-testnet versions of their APIs for clients to use....
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Ethereum Exchanges compatibility matrix? <- concerns due to warnings regarding “smartcontract deposits”

Is there a "exchanges compatibility" features list/matrix, so I know between which I can move Ether directly? Context+example use case: I've tried to move Ether between exchanges, however warnings ...
2
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1answer
1k views

ETH vs ETC on Dwarfpool and Poloniex?

Noob miner here, Does anyone mining on Dwarfpool know if they have updated to the forked code (ETH), or are we still mining Ethereum classic (ETC)? I currently use Poloniex as my intermediary wallet ...
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1answer
25 views

Correct approach of replicating smart contract balances

We are storing user balances on smart contract and as well as on our local db, so that we dont always have to query blockchain for user balance. For this we use contract events to update balances ...
1
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1answer
92 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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3answers
366 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
93 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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0answers
147 views

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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188 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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API of EtherEx, give an example

Please give an example how to use EtherEx API from both JavaScript and Python programs. Where should I connect before sending a method call? I am especially interested in add_market method.
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0answers
30 views

Is there any way to create tokens for every user in my platform?

I'd like to make a user issued tokens exchange platform. For example, there are A tokens issued by user A and B tokens issued by user B. One A token is exchanged with Two B tokens. All users have ...
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0answers
50 views

How exchanges manage their wallets for users, and where can i find info regarding

I am developing a platform where average users can easily trade Cryptocurrency. I would like to know how exchanges are managing wallets. where they provide a depositing address to each user for each ...
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0answers
65 views

Has an exchange ever voted with a users tokens?

If a token allows tokenholders to vote on some issue/proposal/action or whatever, it is conceivable that a token-exchange that holds its customers' tokens could covertly, or perhaps openly, vote on ...
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310 views

Decentralized Exchange on Ethereum

I know this was asked several times on stackexchange, but after I see there are some alternatives for Ethereum Decentralized Exchange, but none seems to be stable. I know about http://etherex.github....
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10 views

Accept popular ERC20 tokens and auto-convert them to ETH in a smart contract

As an intermediate in smart contract development, I'm now facing the challenge where I would like to unify payment on the Ethereum ecosystem in a way that holders of popular ERC20 tokens can pay my ...
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25 views

Calculate exchange rate

I am running am ethereum node and I'd like to calculate the exchange rate of any token into USD, without using any external API. How do i accomplish this?
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19 views

Could there be multiple asset pools In a DAMM liquidity pool?

In a DAMM (dynamic automated market making) DEX (decentralized exchange) the ration between two assets, e.g. DAI/ETH does not have to be 50/50 anymore, like it used to be in a AMM, (automated market ...
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0answers
9 views

IERC1155Views - whether and how to use it?

Do I need to have IERC1155Views interface in my ERC-1155 contract to determine the number of decimals after the dot for the exchanges? If I don't specify IERC1155Views, what number of decimals will ...
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Is there any connection between Serenity Market and Ethereum 2.0 (codename Serenity)?

From what I gather, no... Simply an exchange that's named the same? https://serenity.exchange/
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18 views

How exchanges handle token withdrawals for their users?

I am working on exchange-like project for ETH and ethereum-based tokens. And I am having a problem with token withdrawals for users. Every user certainly makes a deposit to his own newly generated ...
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0answers
18 views

Is there an ERC for exchange deposits or merchant deposits?

The title is the question. I have searched for any discussions of similar topics, but after looking at various CEX platforms across the world, most are just generating a bunch of keys and doing value ...
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0answers
291 views

Is it required to use multiple Etherem accounts to send transactions on behalf of customers to avoid pending transactions?

We are developing an Ethereum based exchange. In our project, customers put their orders to send ETH or ERC20 tokens to others, and we currently do these transactions via our Ethereum account on their ...
0
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1answer
19 views

how to check instantly when a user charges amount to his address generated by our app

Our app needs to detect and create a charging order asap whenever a user charges an amount of ETH/USDT(ERC20). Due to the limit of infura API, we decided to set up our own ETH nodes and use JAVA to ...
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174 views

Exchanging tokens to ETH using Uniswap (v1)

I am trying to create a simple function that buys a token from uniswap (v1) and then immediately sells the token back to ether. I am able to buy successfully but when adding the calls to the sell ...
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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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22 views

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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21 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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9 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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2answers
29 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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615 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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47 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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234 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 ...
0
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1answer
131 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 ...
0
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1answer
643 views

Bitpay for Ethereum?

I'd like to help an organization accept Ethereum. However, they need a Bitpay-type service that sends them USD right away. I know they can just manually sell on Coinbase daily/weekly, but they can't ...
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2answers
74 views

How to make token for exchange such as bittrex? I'm interested only in technical side of this question

Should I set a starting price for the token? Is there a source code for the token for trading on the exchange?
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1answer
853 views

Buy a small amount of Ethereum

I'm new in Ethereum, and I would like to buy a very smart amount of Ethereum. I want to learn more about ETH, and at the moment I would like to invest $10 or $15. Do you know any website where I can ...
0
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0answers
677 views

Transfer Ether between wallets

I am using Kraken to purchase Ether and now I want to use some third-party wallet to withdraw Ether and wallet should provide an API to transfer Ether from my wallet to another wallet. MyEtherWallet ...
0
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1answer
296 views

user api to exchange eth token and wallet address creating using code

Is there any API to help exchange ether or tokens online which will help in coding an exchange. For bitcoin one can generate a wallet address, is it possible to generate a wallet address for Ethereum ...
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1answer
967 views

Swapped ETH to BTC at myetherwallet.com (via MEW) and still no funds

about 2 days ago, using myetherwallet.com (via MEW) I swapped some ETH for BTC, with no funds arriving at my BTC wallet, and funds are still missing from my ETH account. I instigated the swap, some ...
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1answer
77 views

Bought Ethreum with BTC, exchange freezed, sync freezed too

I've purchased ETH by BTC. My exchange stucked on "Awaiting Exchange" (like 2 hours now) and my Sync stucked at the same time (19%). What should I do now? Thank you!