All Questions
2,660 questions
0
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71
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API for ETH to USD based on time and date
Does anyone know an API that will work based on any period of time. An API where I can put the year, month, day and time and it will give me the ETH to USD conversion at that moment?
- 1
0
votes
1
answer
8
views
How I decrease the gas fee when I call the contract method?
Deploying my contract on rinkeby cost ~12 USD in gas fees (using truffle cli). Is it possible for me to specify gas fees/set a limit in the smart contract so it costs me 0.5 USD, but takes longer to ...
- 101
0
votes
0
answers
7
views
Lost ETH using BOT [duplicate]
I am a newbie and saw a video in YouTube about setting up ETH contract using BOT. The code was also given by the YouTuber. I created the contract and linked it to MetaMask and then transferred ETH to ...
- 1
0
votes
1
answer
43
views
Failing while trying to deploy ETH SAFE on BASE. What am I missing?
I tried following the steps outlined here:
https://help.safe.global/en/articles/40812-i-sent-assets-to-a-safe-address-on-the-wrong-network-any-chance-to-recover
https://share.zight.com/z8uBKZYr
This ...
0
votes
1
answer
20
views
Lost assets after deleting the account
I'm not sure this is the correct way to contact. I accidentally deleted my one account from the Metaskwask wallet and when I recovered my account with my secret phrase I couldn't find some of the ...
0
votes
0
answers
13
views
Finding cost of CHI gas token over a series of time
so I wanted to use a database I have to find the cost of the CHI gas token over a series of time. I got all the pools that have a CHI gas token, and I get data1 / data0 from all the sync events in ...
- 1
0
votes
1
answer
39
views
Transferring Assets Between Ethereum and Binance Smart Chain
i would like to know how to Transfer crypto Assets Between Ethereum and Binance Smart Chain . Many thanks
- 141
0
votes
0
answers
19
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Request for Goerli/Sepolia Testnet Ether [duplicate]
I'm currently developing a blockchain application for my internship and need some Goerli or Sepolia testnet Ether to deploy and test my smart contracts. Unfortunately, I don’t have any previous ...
- 1
0
votes
0
answers
70
views
Accidental ETH Base Exodus to ETH Kraken
Just need an answer wether i should have some hopes or not. Accidentally sent £500 BASEETH TO ETH Wallet and has succesfully confirmed on blockchain! No coins appeared and Kraken is simply saying your ...
- 1
0
votes
0
answers
26
views
Executing contract function to change Contract state
i am trying to execute function that changing the state of the contract, currently i am testing it on my localhost hardhat node.
this is my function (in my contract)
address owner;
string[] ...
1
vote
3
answers
2k
views
Uniswap app on Sepolia testnet is not loading any tokens
'https://app.uniswap.org/add/ETH?chain=sepolia' is not allowing me to create any new Pools, or 'https://app.uniswap.org/swap' doesn't load up any possible tokens so swap.
I am connected with my ...
- 21
0
votes
0
answers
14
views
Is it possible to know all transactions of buying or selling a certain coin within trading platforms like kucoin ...?
Is it possible to know all transactions of buying or selling a certain coin within trading platforms like kucoin ?
- 1
1
vote
2
answers
36
views
Is it possible to create a queue of transasctions?
I am wondering if it is possible to create a queue of transactions. In my case I want to add all incoming transactions to a queue and randomize which ones are completed and which ones are canceled. ...
0
votes
1
answer
21
views
Users service wallet and gas
I have created a service (.NET) that uses Smartcontract.
I chose Infura to work with network infrastructure.
Everything works fine... recently it occurred to me that I need to add something like user ...
- 13
0
votes
0
answers
248
views
I can’t buy sell or transfer any coin on eth using my coinbase wallet. Fails instantly , says failed to sign. Same wallets works on Base
I can’t buy sell or transfer any coin on eth chain using my coinbase wallet. Fails instantly , says failed to sign. Same wallets works on Base chain. Have tried uniswap sushiswap MetaMask, sending, ...
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1
vote
1
answer
82
views
How to estimated balance changes by web3.py
I am simulating the information obtained before the interaction between the wallet and the contract in the figure below through web3.py. I want to obtain the Gas fees and benefits before the actual ...
- 11
0
votes
1
answer
49
views
I need the address of the oracle service that provides football match results and related pricing information
I am a blockchain developer, and I am currently working on a football betting project. I have completed the development of the relevant contracts on Ethereum. Now, I need an oracle service that ...
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-1
votes
1
answer
32
views
I updated Solidity to version to 0.6.12. Now the code is broken, how to fix?
How can I fix my code, the chainid is 9999.I tried changing chainId := chainid to chainId := chainid() but it doesn't work. Here is the whole code:
pragma solidity 0.6.12;
import './interfaces/...
0
votes
0
answers
11
views
Need Assistance Resolving ds-math-underflow Error in Liquidity Pool Transaction
I'm currently facing an issue while trying to lock my share of the liquidity pool on the blockchain. Despite successful tests in a Hardhat environment, the transaction is reverted when executed on the ...
0
votes
1
answer
53
views
Why is my _transfer function transfering all my tokens to the deadWallet?
I wrote this simple contract that is designed to burn (send to deadAddress) all transfers that in which the sender of the transaction is not the LP address. I provide liqudity on uniswap and then set ...
0
votes
1
answer
157
views
Reading Ethereum contract event TypeError: Cannot read properties of undefined (reading 'toHexString')
I have the following js script that i want to use to read events from a smart contract below, but when i run the script I get the following error message
TypeError: Cannot read properties of undefined ...
0
votes
0
answers
10
views
Anyone able to guide me [duplicate]
So I was using the website crypto Leo, and deposited $30 worth of ETH but for some reason it’s been sent to an address on etherscan 0x5495dAeE61D2c2143E92ECb2EA395042783cC4cd can anyone advise me what ...
- 1
0
votes
0
answers
24
views
Issues Adding Liquidity on Mainnet with a Custom ERC20 Token (It Works Using Hardhat!)
I've developed an ERC20 token using Solidity and have successfully tested its liquidity functions on Hardhat. The process completes successfully in the Hardhat environment, but when I attempt the same ...
0
votes
1
answer
53
views
Best Practices for Gas Optimization in Ethereum Smart Contracts
Ethereum community!
I'm currently working on developing a smart contract for a decentralized application (dApp) on the Ethereum blockchain. I'm concerned about optimizing gas usage to enhance ...
- 5
0
votes
1
answer
24
views
How to enable multi-payment in the NFT marketplace like ETH, USDT, MATIC, DAI, etc?
Hope you are doing great.
I'm trying to build a NFT marketplace with multi-payments.
When users buy a NFT, they must be allowed to pay with any of the payments such as ETH, USDT, MATIC, DAI...
How to ...
0
votes
0
answers
13
views
Searching for proof-readers: "The Aftermath of the Ethereum Merge"
Dear Ethereum enthusiast,
I am currently a Business Engineering student at Ghent University in Belgium. As part of my degree requirements, I am conducting research on the Ethereum Merge for my master’...
0
votes
1
answer
17
views
Does Ethereum ever charge an "unusual funds fee" [duplicate]
Trust wallet is telling me I am being charged an unusual funds fee by Ethereum for a mysterious deposit which appeared in my account. I didn't make the deposit.
- 11
2
votes
1
answer
77
views
C code to sign a message compatible (such that can be verified) with Metamask, mycrypto, etc
I am on macOS and trying to put together the code to sign (and once I succeed to verify) a message with an Ethereum private key. So, the private key (just used to test, no funds there lol) is: ...
- 21
0
votes
0
answers
56
views
TypeError: isAddressable is not a function
before i start with question i looked at this answers first and second,but nothing helped. I am writhing some unit tests for my smart contracts using hardhat and keep getting error TypeError: ...
- 147
0
votes
0
answers
904
views
Getting `Connector not connected` error with wagmi
I'm integrating Wagmi into my Next.js application to handle contract simulation in the backend with tRPC. However, I'm encountering an error message stating Connector not connected. I've attempted to ...
- 124
1
vote
1
answer
32
views
How do I properly call the transferTokens() function?
This first contract creates a liqudity pool for the two tokens on sepolia test net
// SPDX-License-Identifier: MIT
pragma solidity 0.8.25;
// Using npm package imports for a Hardhat or Truffle ...
0
votes
1
answer
28
views
How to send a request for eth to a user that they can confirm with their metamask wallet?
I am trying to build a Dapp that relies on this functionality.
A user will request another user for some eth, and the sender would then see a pop up notification on their wallet ex Metamask or some ...
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0
votes
2
answers
338
views
What is the best way to monitor all token balances of wallet address?
Context
I'm developing a personal project to monitor token balances of all wallet addresses in my service . I can monitor token balances of several addresses by multicall. I designed my workflow of ...
- 543
0
votes
0
answers
67
views
I want to cash in my 0.0249 ETH but it's saying insufficient funds?
I tried this via Transak on Metamask. Is there some minimum amount so I'm not allowed to get my money out? I hated giving them all my data to set this up too and then it didn't go through. I'm new and ...
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0
votes
0
answers
42
views
I am experimenting with a contract and creating my own router and running into a verification Issue on EtherScan
hope you all are well. I wanted to see if anyone would be able to help me diagnose what I could possibly be doing wrong. Ive read through numerous posts and it seems many solutions have not yet helped ...
1
vote
1
answer
118
views
My Coinbase Wallet Seedphrase is compromised
An address has taken all my Ether. My problem is that i linked my wallet with a few presale crypto. How do i go about it? How do i link a new wallet with the connected presale cryptos?
- 11
0
votes
1
answer
23
views
How should I handle tax that is less than my denominator?
Hello I am a new solidity dev. In this tax function I am dividing by the simplifed fraction ex(5% =1/20 so I am doing amount/tax rate). My question is since I am deploying on a network with low gas ...
0
votes
0
answers
37
views
Stealing funds with batchTransferWithAuthorization(0xcccbb34c) and safeTransferFrom(0x42842e0e)
I had funds stolen from the Arbitrum and Ethereum network the other day using batchTransferWithAuthorization(0xcccbb34c) and safeTransferFrom(0x42842e0e).
Is it enough to do a revoke so that the ...
- 1
0
votes
1
answer
47
views
Sent Eth to contract address can I get it back
I sent some Eth to a contract address rather than my wallet. Can someone with some code experience have a look at this contract and let me know if there is a function on here that the Devs could use ...
- 3
0
votes
1
answer
22
views
Converting ETH from Ethereum Wallet to BNB on a (BSC) Wallet
How can I programmatically convert ETH from an Ethereum network wallet to BNB on a Binance Smart Chain (BSC) network wallet?
- 141
0
votes
0
answers
28
views
How to send entire account balance to another address on Base
The below code is what I used to transfer entire account balance to other address on the ERC20 network and it works fine on it, but not on Base. Maybe it's because Base has different transaction fee ...
- 103
0
votes
0
answers
161
views
Replacement fee too low, Base Sepolia
This is the code I have for sending a transaction on Base Sepolia. I am using this to split the balance in my account into two halves and sending each half to an address one by one.
export async ...
- 103
0
votes
0
answers
16
views
Solidity Value Assignment
Is there any way to assign a solidity variables value to current ether price and if it changes value will to?
- 61
1
vote
0
answers
22
views
Need to perform self destruct contract
I have been involved in a scam and need to get my funds transfered to another wallet in my name. I assume there is a contract preventing send capability, so I need someone who knows how to perform a ...
- 11
0
votes
1
answer
23
views
Actual Stable STABLECOIN
What is the best way to make a stablecoin which will stay stable irrespective of the market or any other factor?
USDT -> Hard to believe someone is storing actual dollars somewhere.
DAI -> What ...
- 168
0
votes
0
answers
41
views
I imported money into etherscan but it didn’t show my real balance [duplicate]
I’m devastated. I poured over a thousand dollars into eth and decided to invest it in a contract bot. After I moved my money into the bot, it shows that I have successfully transacted the money (0....
- 1
0
votes
1
answer
31
views
Receive Eth from an EOA and carry out some actions as a result
Is there some way of receiving Eth in a contract from EOAs (say from most of the existing wallets) and carry out actions as a result?
I know the basic way of receiving Eth is via the receive function. ...
- 13
0
votes
0
answers
19
views
Possible to use CallContract during validation (on block not yet included in blockchain)?
I'm building a consensus engine. Already built a prototype of it, and now interested in improving it (mostly simplifying the implementation so it fits better with existing Ethereum codebase with least ...
- 211
0
votes
1
answer
26
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Forking Swap from bsc on goerli, max input of native token 0
I'm trying to fork cheeseswap from bsc onto goerli. I've also tried to fork another swap from another network onto goerli and have the same issue. I Change all the chainid numbers, rpcs, factory, ...
0
votes
0
answers
52
views
Lost funds via phishing/approval. Please help
It appears that ~0.137 ETH was automatically sent from my address to "Fake_Phishing188250" via a "Claim" transaction (...
