Questions tagged [exchanges]

places to trade ether with other currencies or assets

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Converting Ether to Monero vs using a tumbler

There are two ways to obfuscate source of funds, in this case Ether: Use a cryptocurrency tumbler, that mixes a source walet's contents into multiple parts that can be sent to a final exchange for ...
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2answers
27 views

Who pays gas fee for ERC-20 token transactions in exchanger?

i am developing an exchanger as a hobby project in next js. I am just starting to learn about blockchain. I am generating new deposit ethereum addresses for every user. Now my main confusion is, when ...
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1answer
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Failing to fill 0x quote

I'm trying to fill a quote that I get from the 0x API: const qs = createQueryString({ sellToken: 'TUSD', buyToken: 'WETH', sellAmount: BigInt(882693 * 10 ** 18) }); ..but the transaction ...
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1answer
11 views

How do obtain wrapped btc and wrapped ada in a local test network or a live test network like ropsten?

In the local test network and ropsten test network, it's easy to obtain ethereum but I need other tokens in order to do testing. I'm not sure how to obtain those tokens for testing.
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Although one or more Error Occurred[execution reverted] [duplicate]

actualy i use justliquidity to place order token change to bnb in price 0.0002 but i cant cancel my order and trustwallet connect justliquidity and i cant how solve probleme and when click cancel ...
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How to query DyDx liquidations from ethereum blockchain?

As far as I understand, all the exchanges like DyDx, Uniswap, Sushiswap etc. are actually contracts deployed on blockchain. So their data should be accessible to anyone having the chain downloaded. (...
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Which payment API I can use to transfer Fiat money to my crypto exchange users ? ( At the time of withdrawl )

I am creating a Crypto exchange using Binance API/SDK , Users will register and deposit Fiat funds first into platform's paypal/stripe account using payment gateway. After deposit they can see virtual ...
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1answer
155 views

Automatically generate an address for a token in the ERC20 and TRC20 network [duplicate]

How to create USDT TRC20 and ERC20 addresses for my wallet automatically via an api. I need to create USDT TRC20 and ERC20 addresses for a small exchange so that users can deposit their tokens, an ...
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104 views

ETH smart contract deposit and withdrawal functionality - multiple addresses?

I have an ERC721 smart contract with basic functionality. When the user deposits this ERC721 token, I generate for him a new eth address. For example using account_pass = random_text() Account....
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2answers
27 views

Would it be possible to integrate crypto with trading bot?

You can create a trading bot in trading view and see how well your crypto would perform in a given time frame. (I can see how much money would I make if I didn't sell or how much money I would make if ...
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How did 1inch token contract get the special address? [duplicate]

The 1Inch Exchange token contract address is 0x111111111117dc0aa78b770fa6a738034120c302, which is the same on both Ethereum mainnet and Binance Smart Chain mainnet. As I understand, when deploying a ...
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20 views

Connect Typescript dependency with Solidity contract

How can I connect my contract with typscript dependency (https://www.npmjs.com/package/@dydxprotocol/exchange-wrappers). I need this function (https://github.com/dydxprotocol/exchange-wrappers/blob/...
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301 views

I'm trying to exchange NMR (Ethereum token) to ETH, but Uniswap & 1inch only suggest I sign a transaction for 0 ETH

I tried to exchange NMR (Ethereum token) to ETH, but both Uniswap and 1inch only suggest I sign a transaction for 0 ETH value. I signed this transaction, and here's the result: What's this "...
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1answer
25 views

If i can deploy an ERC 20 to an exchange and sell it is it technically free money?

Can you deploy an erc 20 token to an exchange? Can you sell your own erc 20 for money? Is this free money because when you deploy it, it gives you all the erc 20 to your address.
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How much liquidity is needed to introduce new ERC20 on uniswap?

How much liquidity is needed to introduce a new ERC20 on uniswap? For example for 250 billion tokens of new ERC20 contract "X" how much it would cost to create a pool so the 1 "X" ...
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1answer
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1INCH Version error

I got error importing and using 1INCH. The problem is in the versions. In IOneSplit.sol version is 0.5.0 (pragma solidity ^0.5.0). And IOneSplit imports IERC20 which is in 0.8.0 (pragma solidity ^0.8....
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How to test contract interactions without pay fee

I have my contract which interacts with two different exchanges, can i test this interaction without pay fee? Before Deploy to the main net? I know it has Ropsten but it wouldn't work i think, i need ...
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1answer
72 views

How to query data from Uniswap using the JS SDK?

I'm having problems retrieving some data metrics using the Uniswap JS SDK. When I try to query getInputAmount it returns this error: (node:88) UnhandledPromiseRejectionWarning: TypeError: Cannot read ...
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1answer
20 views

Deploying ERC20 emblem

When Bitcoin and Ethereum initially launched they had emblematic figures such as a B and a prysm to represent the token on exchanges and wallets e.g. MetaMask. Does one have to use JavaScript to ...
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Are binance ERC20 token transactions not on the ethereum blockchain?

I'm using web3js get transaction info on a specific ETH address. When I make the getTransactions call, no info is presented. I then check etherscan and also see that my binance ETH wallet (for ...
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What are incoming transactions to Binance

The Binance addresses and most other centralised exchanges exhibit a clear transaction pattern: All of the incoming transactions are from arbitrary EOAs and transfer Ether with them. Does anybody know ...
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Is there a decentralized exchange that handles buying Ether (and other cryptocurrencies) for fiat money as well as other cryptocurrency?

I was looking at dapps a few days back (maybe on https://www.dapp.com ?) and remember encountering a decentralized exchange that allowed users to buy Ether with fiat currency (I specifically remember ...
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Get Uniswap Exchange Rate of any Token with Web3

I need to get the exchange rate for every token on Uniswap with Web3 like Uniswap itself which they then display on their web interface on app.uniswap.org like this: So when I enter to swap the ...
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1answer
36 views

Is uniswap supply and demand model opposite of other exchanges

Let's say we have an ETH/USD pair. Normally, I would expect that if more people are buying ETH than selling ETH, the price of the pair goes up. This is because there is more demand for ETH, but the ...
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1answer
131 views

Converting between USD and a custom ERC-20 token

Right now, the best way to convert USD to a custom ERC-20 token, like DEV is to first convert the USD to ETH and then convert the ETH to DEV with an exchange like Uniswap. Along the way, the ETH might ...
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1answer
160 views

How Do Liquidity Pool Economics Work?

I'm looking at liquidity pools (LPs), and the economics don't make sense given the APYs. How is this possible, or are exchanges simply taking a loss to establish market dominance? Please tell me if/...
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1answer
111 views

If crypto deposit and withdrawal limits are unknown, will excess ETH deposit be lost? [closed]

Binance, a centralized exchange, doesn't publish its daily crypto deposit and withdrawal limits for unverified accounts in its FAQ. If I deposit a large amount of ETH to my Binance account's Ether ...
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18 views

Are there any open source accounting systems

I am looking for some accounting system for my project. I am developing an app where people have their own accounts, just like on any centralized exchange. Users will be able to deposit some ERC20 ...
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81 views

Is Kraken hiding the real cost of deposit?

A part of my current strategy is to mine ETH, and to send a part of it from my wallet (MEW) to Kraken for: a) buying BTC b) withdrawing some sweet € to pay the bills. When I'm using MEW to send ETH to ...
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1answer
38 views

Exchange wallets, hardware wallets and web wallets: Why don't they all have a seed recovery phrase?

Here's what I think is going on Exchange wallets for ether have no seed recovery phrase. Only one's log-in and password to their account on the exchange grants access to their wallet. Hardware ...
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122 views

Can an Ether wallet address be traceable to a crypto exchange?

If an ETH wallet address was created upon the opening of a Binance or Coinbase account, is there anything in the address itself, or its activity, that can give clues as to whether it was in fact ...
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1answer
476 views

Decentralized exchange that lets you cash out Ether for fiat money?

Uniswap is a decentralized exchange that doesn't require KYC or ID for trading between ETH and ERC-20 tokens (altcoins), while Bisq is a decentralized exchange that doesn't require KYC or ID for ...
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1answer
58 views

Are liquidity pools the decentralized exchange equivalent of storing assets on centralized exchanges?

We'd think that decentralized exchanges are just the same as centralized exchanges in terms of functional purposes which are trading storing crypto assets However, the second item is not readily ...
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1answer
33 views

Sushi swap exchange rate question

I found the exchange on sushi swap or uni swap always changing, if I change 1000 usdt to USDC, the rate is better than changing 10000 usdt, usually if you change more, the rate should be better? Why ...
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144 views

What is the rationale behind lower minimum deposit & deposit fees for ECR20 Tokens vs Ethereum? [closed]

While examining the fee structure on Kraken I noticed the following peculiar pattern: Ethereum: Deposit Minimum: 0.05 ETH (approx. $61.99 at time of posting) Deposit Fee: Variable on-chain fee to ...
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1answer
413 views

A cheap way to convert between USDT and USDC

Any decentralized cheaper way to convert usdt and USDC? I heard that usdt and usdt also freeze the assets? Any reliable usd service that can not freeze assets?
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Any decentralized exchanger to convert between btc and eth?

Any way to convert on different chains?That means we can convert between btc and eth on different chain.
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Recover Lost Funds from Botched ETH Deposit Without Access to Private Keys?

I'm using the wei approach (4 right-most zeros) as a marker to track user deposits on my site. In short, every user on the site is told to append a custom amount of "wei" to every deposit ...
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1answer
3k views

How does “swap” work between ERC20 tokens? And what is “swap”?

What is "swap" presicely between ERC20 tokens? Is it exchanging one ERC20 token for the other without fees, in the most possible native way? How is it different from "convert"? Let'...
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70 views

i need some help transfering funds back into my account from a smart contract i accidentally sent funds to

i was using uniswap and i thought i was easily transfering one token into another and somehow i put myself into a smart contract and cant get my funds back.... yesterday i had figured out with the ...
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1answer
3k views

Why isn't Polka Dot listed for trading on Uniswap?

Uniswap is the leading decentralized exchange for many ERC20 tokens. DOT is an example of such a token I'm guessing since it's a self-declared complementary extension of the Ethereum ecosystem, so why ...
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29 views

Solidity contract: How to deal with return parameters in solidity

i am having an issue with an function I would like to call. Following case: The function looks like this: Params Type token0 IERC20 token1 IERC20 amount uint256 parts uint256 flags uint256 and ...
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31 views

Running Ethereum Exchange (including ERC 20)

Would it make sense to run the app server and an Ethereum node on the same machine considering how closely they interact? Or should they be on separate machines to not affect each other? What is the ...
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Is there any decentralized exchange to convert between eth and different chains?

I found most of the decentralized exchangers can only convert among erc20 tokens but cannot deal the btc or other coins running on different chains. Is there any that can deal with this?
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53 views

How to identify ether payments from an exchange?

I am building an application that accepts payments from its users. Nowadays, only users with a wallet can make withdraws to a smart contract address(mine). This is because each user has a single and ...
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25 views

how does exchange buy new tokens?

Question 1: So, let's look at exchanges. Let's say I want to buy the token - OmiseGO (it's an ERC20) token. I know that on the exchange, I can directly buy ERC20 token from someone like a trading ...
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1answer
33 views

How to handle forks, dropped/reverted blocks

I'm building an ethereum wallet, I've setup geth. I'm planning to subscribe to new transactions on geth websocket, I can't figure out how to deal with dropped blocks and hardfork. let's say a user ...
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1answer
54 views

Is the Ethereum 2.0 price fixed to the old Ethereum permanently?

I read that it will be possible to convert one old Ether for one Ether 2.0 but not vice versa. Is this correct and does the algorithm guarantee this "exchange rate" forever (and thus protect ...
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1answer
28 views

withdraw Ether from an exchange to a smart contract…!

ralated to this topic Can I withdraw Ether from exchanges to a contract wallet? I have a question that how exchange understand which address is a contract and how doesn't pay gas more than 21000...?
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2answers
530 views

Why addresses from the exchanges do not show on Etherscan?

I have some ether in an exchange but when I searched it on etherscan.io it is showing There are no matching entries there I got to know exchanges have the balances on their own wallet address, but ...

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