Questions tagged [exchanges]

places to trade ether with other currencies or assets

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47 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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3answers
53 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
30 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
91 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
27 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
70 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
58 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
15 views

Create token exchange by defining decimal values

I just learnt 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
53 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
36 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
42 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
66 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
212 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
32 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
19 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
28 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
158 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
127 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
67 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
26 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
60 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
63 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
316 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
370 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
242 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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0answers
63 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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1answer
17 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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0answers
387 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
449 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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0answers
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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0answers
178 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
71 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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1answer
136 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 ...
2
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1answer
76 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
29 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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0answers
175 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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1answer
118 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 ...
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3answers
913 views

How to monitor a large set of ethereum address for balance?

I am planning to build a system where users will get notified through an email and app notification if there was any change in their ether balance. I was confused how to monitor a large set of ...
2
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1answer
241 views

Making micropayments possible

I think it's clear that the current ethereum network is not quite suitable for IoT based micro payments. And the slow transition toward PoS, which recently started, will put even more emphasis on gas ...
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1answer
91 views

How to Include a Lock that will Stop Your Tokens from Being Listed on Exchanges?

We are working on a security token sale and are aware we may need to be able to "lock" our tokens, not from being transferred from person to person but from being listed on any exchanges decentralized ...
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2answers
880 views

How to receive ether in wallet address and forward to another address on successful deposit?

I want to implement a feature in which users will send ether to wallet address(0x123) and on successful deposit, it needs to automatically transfer to my cold wallet(0x983). I can able to achieve ...
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0answers
16 views

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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1answer
51 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 ...
1
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1answer
383 views

MetaMask Not showing Token Tab

I have created my token "BBY" that is ERC20 complaint, right now I've sent all the tokens to the owner's address. I will be giving out tokens when some one sends ether. I have deployed it to Ropsten ...
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1answer
47 views

Trading ETH with lightweight Know Your Customer requirements

Clearly banks follow AML/KYC regulations. But every bitcoin exchange (Ethereum exchange) I've seen has registration requirements that are far in excess of any bank I've used. Gemini requires your ...
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1answer
179 views

Ether Delta and the ICO guide to getting listed

DISCLAIMER: This is a new ICO wanting information on how to get their token listed, uploaded or placed within EtherDelta's listing so we can sell on ED, Not a ICO guru telling how to do it. Now that ...
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1answer
22 views

Tokens and exchanges [closed]

Token help We have created a utility token do we place our total supply on one exchange or divide and distribute portions of our total supply on multiple exchanges?
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1answer
631 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 ...
2
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1answer
246 views

How to implement user deposits for tokens for an exchange

If we generate new deposit addresses for every user we face following problems: - we need to transfer tokens from individual wallets to our exchange wallets - we need to fund the wallets with ether to ...