All Questions
Tagged with smartcontracts solidity
1,848 questions
0
votes
0
answers
26
views
Error: cannot estimate gas; transaction may fail or may require manual gas limit [See: https://links.ethers.org/v5-errors-UNPREDICTABLE_GAS_LIMIT]
I have written test cases for the Bridge smart contract, which uses LayerZero for cross-chain communication. However, when I set up the Hardhat project and attempted to run the test cases, I ...
- 11
0
votes
1
answer
37
views
Chainlink VRF: Created Subscription ID Mismatch Between On-Chain and Dashboard
I'm encountering an issue where the subscription ID returned by my script is different from the one shown on vrf.chain.link for the Sepolia network, which when i try to fund to the subid from my ...
0
votes
0
answers
34
views
Can I implement a tax deduction feature in an ERC20 contract where the tax is deducted in BNB or ETH when a user swaps tokens on PancakeSwap?
The _transfer() function only handles ERC20 token transfers, so I can't implement any logic for ETH or BNB within it.
I integrated some functions, but they were not callable on PancakeSwap. When I ...
- 11
1
vote
0
answers
12
views
Error in adding a struct containing a mapping in an array in solidity
I am new to Solidity and am trying to add a struct containing a mapping to an array. However, this fails. When I run this on Remix I get a message transact to CampaignFactory.createCampaign pending ......
1
vote
0
answers
24
views
Uniswap V3: Unable to Add Liquidity After Deploying ERC20 Token with Tax Mechanism
I am trying to add liquidity to Uniswap V3 for my ERC20 token, which has a 4% tax deduction on transfers. The tax mechanism ensures that whenever users transfer tokens, 4% is sent to the owner's ...
- 11
0
votes
0
answers
29
views
I am unable to swap the token after adding liquidity to Uniswap V2
I have deployed an ERC20 contract on the Sepolia chain and added liquidity on Uniswap V2. However, when I tried to swap the token with ETH, the token price was not being calculated, and I was unable ...
- 11
0
votes
1
answer
39
views
Pitfalls in small smart contract
Here is a question from a coding interview. I am just wondering what would be the major pitfall in this small smart contract in your opinion:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
...
- 76
0
votes
0
answers
83
views
PancakeSwap universal router usage. Web3, PancakeSwap, Bsc testnet
I'm working on an integration with PancakeSwap using Java and Web3J. All my tests were conducted on BSC Testnet.
After conducting some research, I used the UI to perform a transaction that went ...
- 1
-2
votes
2
answers
55
views
Why it is taking high cause fee
https://bscscan.com/address/0x1732b451aa189832109e8715b9ae0563bab7c2bc#writeContract
I have deployed this contract on BSC, can someone guide why it is taking some much gas fee.
If you have any ...
- 33
0
votes
0
answers
16
views
I am currently working on a project and encountered a persistent issue with deploying smart contracts on the Hardhat local blockchain
Issue Summary:
1.Problem: When deploying two smart contracts (DonorRegistration.sol and DonationRecords.sol), they were both getting the same address on the Hardhat network, which should not happen.
2....
0
votes
0
answers
29
views
Cannot place a transcaction on a smart contract through the front end
Im trying to use a bet function i have build on a smart contract but keep getting this error here:
page.js:92 Error placing bet: Error: transaction execution reverted (action="sendTransaction&...
- 19
1
vote
0
answers
24
views
How to Deploy a Smart Contract and Have Someone Else Sign the Transaction? Polygon
I'm trying to deploy a Smart Contract on the Polygon mainnet, but I need the deployment transaction to be signed by someone else's wallet (so they become the contract owner and receive the tokens).
I’...
- 11
-1
votes
1
answer
93
views
Why are the NFT images not visible?
I created a ERC721 type smart contract to mint 8 NFT's to the Polygon blockchain. The NFT images are stored on my own server (for this project I don't use IPFS). I also created the corresponding json ...
- 1
0
votes
0
answers
44
views
Facing error(Execution revert: STF) while swapping the USDC into wAVAX Tokens in Avalanche C chain
I'm facing the Error(execution revert: STF) while swapping USDC into wAVAX
I’m encountering the following error message when attempting to swap USDC for AVAX using the Uniswap V3 exactInputSingle ...
- 1
-2
votes
1
answer
149
views
Where does this smart contract send the money? [closed]
I am new to Solidity and Smart Contracts.
I saw a Youtube video of a supposed automated bot which I am sure it is a scam.
This is the code the they provided and I cannot tell where the money is ...
- 1,771