Questions tagged [binance-smart-chain]
The binance-smart-chain tag has no usage guidance.
112
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fun project i want to create a CEX
hey i want to create a centralized exchange just for fun project and to understand how things works. Is there any good open source project and good docs for that please? Thank you !
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What the trick of this solidity, scammers/dev can sell more than the total supply also contain a honeypot, can anyone explain what happened?
*Submitted for verification at Etherscan.io on 2023-05-18
*/
// t.me/BestWallet
// BestWallet.com
pragma solidity ^0.8.15;
library SafeMath {
function mul(uint256 a, uint256 b) internal pure ...
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33
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_transfer() Function problem : Cannot estimate gas; transaction may fail or may require manual gas limit
I'm new to Solidity and it's my first try to write a smart contract using Openzeppelin, Pancakeswap and BEP20 libraries basically to make a BEP-20 token with the following features :
Ownable,
...
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2
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692
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invalid opcode: opcode 0x5f not defined
I'm new to Solidity and it's my first try to write a smart contract using Openzeppelin, Pancakeswap and BEP20 libraries basically to make a BEP-20 token.
When i try to deploy the smart contract, i get ...
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1
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109
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Fighting against BNB sweeper bot
here's a short description for people not involved in crypto world.
There's a Metamask crypto wallet that was connected to BNB network,
and used to stake some tokens (freeze them for long time to get ...
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7
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What changed in the consensus mechanism in Luban Update of BNB Smart Chain?
I am trying to validate the BNB SmartChain blocks and after the last update in the testnet of the chain, the signature of the blocks are not being validated. I can see the Extra Data field is much ...
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15
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How do i code a deposit/withdraw solution like stake.com?
I want to build a similar solution, where users can deposit BNB to a smart contract and we will then credit the user with in-game tokens in our game.
When a user wants to withdraw we need a solution ...
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33
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BSC Wallet hacked. Sweeper in my wallet [duplicate]
new here!
Recently my seeds were compromised/stolen (maybe a suspicious download). I have some blocked tokens linked to my wallet. Whenever I transfer some Token, the sweeper transfers it to the ...
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1
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94
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can I withdraw funds from a smart contract without a withdraw function?
Is there a way to withdraw funds from a smart contract that doesn't have a withdrawal function?
I have tried different ways, but I don't understand How can I do it exactly. The contract is deployed ...
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56
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HTTP requests limitation for an Ethereum Node
I have a fully synced Binance smart chain node with a proxy_pass to nginx for external request.
The problem that i have is the JSON-RPC return "null" if i process a large amount of requests.
...
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28
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Smart Contract not Transferring balance
I just started learning how to write smart contracts. I've been stuck on one thing for the past 2 days, I cannot get the contract to transfer the balance out once it ends.
Step 1 - Users send BNB to ...
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12
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How to implement Cross-Chain in ICO
While checking ICO presale sites, I noticed they have chain switch functionality.
For example, when I visit c+ charge, I see the below Ethereum - BSC network switch.
What I want to know is how to ...
- 15
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24
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PoSA(Proof of Stake Authority) and NPoS(Nominated Proof of Stake Authority?
The Proof-of-Staked-Authority (PoSA) consensus algorithm is a hybrid between the Proof-of-Staking and Proof-of-Authority consensus mechanism.
Nominated proof of stake, or NPoS, is similar to proof of ...
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121
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Binance smart chain node API provider without billing per websocket response
I'm unsure if this is the correct place to ask but I thought I'd try anyway.
Problem
I want to build a Node.js application using the Web3 library. The application should collect prices on liquidity ...
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15
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Need help with a hacked MM defi wallet
How do I find software to run on my hacked defi wallet so I’m can beat the hacker to my tokens which he is harvesting from my staking which produces tokens 24/7.
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How do I integrate crypto options into my website?
I'm trying to add crypto options to my website. I've seen the name Ribbon finance a few times as a defi options provider. They don't seem to have the contracts that I'm interested in implementing on ...
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How to fix "Warning: Visibility for constructor is ignored"? [duplicate]
I made a token for family and friends, mostly to commemorate a loved one, the total coins are their date of birth, nerdy I know, but very me.
The issue I have is I'm only learning to code very ...
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62
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Checking for a transaction on a large number of bsc addresses
I need to frequently check a large number of addresses for transactions on the bsc network (at least a thousand per second), what is the best way to do this? The only solution I know of is to run my ...
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44
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Calling emergency withdrawal on deployed unpublished smart contract Binance
Does anyone know how to call emergecny withdrawal function on a contract that is live and in use but not published on BSC Scan?
Example: 0x7F62c957151810cD743e5707465F4937422300cC is live but not ...
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30
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Extremely High gas price after Transparent Proxy Upgrade of BEP20 token BSC
I upgraded my BEP20 token contract recently and all seems normal except that now the gas fees went from average of 35 to 50 cents to $13 to $32 dollars for 1 single token transfer, we are using the ...
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3
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206
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How can i input 0.001 value in solidity?
I want to list token on marketplace and price in form 0.0001 or 0.2 etc
how can i do that ?
solidity just unit.
thanks a lot.
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28
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Is it possible to simultaneously call a method from the children's smart contract by the parent's smart contract?
I have a smart contract on the BSC network that has created a large number of children and stored the address of each. In the child smart contract, the UUDT token is stored. Also, each child smart ...
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284
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Error: invalid BigNumber string (argument="value", value="5.01", code=INVALID_ARGUMENT, version=bignumber/5.7.0)
I get this error, I tried to convert value values to String as proposed in some solutions but nothing
const express = require("express");
const http = require('http');
const Web3= ...
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43
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"Error: Function call to a non contract account " without any context
I have been learning about reading from Blockchain and been trying to put tokens from Pancakeswap using the functions -allPairs() from PancakeV2Factory and -token0() ,token1() from IPancakeV2Pair
...
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1
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70
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I want to access several multi-sig wallets deployed with pragma solidity >=0.5.0 <0.7.0. How can I get the right frontend? Github Gnosis Safe v3.12.0?
I have several wallets that need to be accessed with the interface that was live on https://gnosis-safe.binance.org. When it changed to https://gnosis-safe.io/app/bnb I transferred several funds but ...
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82
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I am trying to bet with CAKE, previously it was BNB, but I am getting "invalid BigNumber value" error
I am trying to bet with CAKE, previously it was BNB.
//Bet UP
const betUp = async (amount, epoch) => {
try {
const tx = await predictionContract.betBull(epoch, {
value: parseEther(...
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1
answer
49
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BNB not received in metamask. account hacked
I send my funds from binance to metamask but they didn't arrive there, as soon as I made the transaction those funds were sent to this 0x9BaA07fE6fe645Bb29A53E064699d30Bd5c63e0E address.
.
please help ...
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433
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Why the BSC block gas limit change and what's the logic behind it?
The bsc block gas limit is always very close to 120,000,000. But it can be 119,529,427 or 119,996,337 for some blocks. It seems to stay between 118M and 120M
Why does it change and what's the logic ...
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51
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I accidentally sent tokens to a wallet address on BSC which is a token contract address on Optimism but not on BSC. Can I get my tokens back? [duplicate]
This is the link for token contract address on Optimism.
https://optimistic.etherscan.io/address/0x8700daec35af8ff88c16bdf0418774cb3d7599b4#code
This is the link for the address on BSC.
https://...
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58
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Staking beginner guide for writing smart contract (binance smart chain)
I have some confusions related to staking anyone can explain these little points.
I want to give staking feature of ERC20 tokens at binance smart chain i have also created a staking contract that is ...
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274
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I got the exact same address for a contract deployed on both bsc and ethereum testnet
I deployed the same smart contract using hardhat on goerli ethereum testnet and binance testnet and i was surprised to see that they both have the exact same address...
How is that even possible?
Is ...
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1
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135
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Why BNB Chain is not working?
My transactions on BNB Chain are not going through. My BNB Chain node is not syncing.
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80
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bscTestnet hardhat deployment problem
I've been racking my brain for quite a while now.
Before, I was able to deploy my code in bscTestnet with no problem, but recently, without changing any code it always stuck and it's not working. so ...
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203
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Buying tokens from a smart contract that receives BNB from another smart contract
I'm trying to develop a smart contract that will receive BNB directly from a token contract and then use this to buy tokens from the BNB it has received.
But everything I try seems to cause issues and ...
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18
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Issue with a smart contract not collecting tokens in the contract
So ive got a smart contract that i found from another ERC-20 network and now im trying to use it on binance smart chain and having an issue, The contract is a token that collects a certain amount of ...
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68
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What would happen to my ETH token if I transfer it from Binance using BEP20 network to Eth main network in Metamask? [closed]
Recently, I transferred Eth from Binance using BEP20 network instead of using ERC20 to Eth main net in metamask. And i also received it in my BNB Smart chain as Bnb pegged Eth.
But soon after ...
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167
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pending transaction doesnt exist on bsc fullnode
I am trying to get pending transactions via the full node in the binance smart chain.
My command to run geth is :
./geth --config ./config.toml --datadir ./node --cache 18000 --rpc.allow-...
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111
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Why WBNB balance does not appear in bscscan?
I'm playing with WBNB, and when I make a deposit of BNB to WBNB Smart Contract I receive the same amount of WBNB to my wallet (I can see it in Metamask). Everything it's Ok.
The problem is that when I ...
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326
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How to create antisniper mechanism swap ERC20?
When adding a pool of liquidity to a pancake, in the first second the dividend is bought up by the bot and users buy already at an inflated price.
There are ways to counter these bots.
However, I can'...
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38
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transfer wbnb from contract to metamask
i transferred wbnb from my deployed contract to metamask using python. The transaction was not executed. However, when checking later the wbnb balance of my contract was 0, my wbnb was stolen. i have ...
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73
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Transfer Bitcoin and other tokens through a Binance Smart Chain
How would one transfer tokens such as Bitcoin through a finance smart chain (so from Binance) to a hardware wallet like Trezor, in order to avoid higher fees? Also, which the third party could be used?...
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Binance Transaction issue, Metamask and Trezor
transaction from Binance does not appear on my Trezor wallet, MetaMask, or any other third-party wallets. When I search for the transaction history in Etherscan it says that it was successful under ...
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Transaction do not appear on Metamask nor Trezor. Binance Smart Chain
I made a couple of transactions from Binance for testing the Trezor hardware wallet yesterday. Transaction history does not, however, appear neither on the Trezor app, MetaMask, or Exodus. I have ...
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119
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Conditional gas settings for BSC transactions with MetaMask
The main objective is to conditionally set the gas price for the transaction on MetaMask in BSC. I understand that MetaMask by default provides with the settings or to speed up the transaction but the ...
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277
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How to get highest volume trading pairs from Pancakeswap using python
Is there a way to get the Pancakeswap trading pairs with the highest volume? I have tried using graphql, but for most queries I get a timeout error 524. I know I can also use the python web3 library ...
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204
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how to setup up Gas Price POA network
I have setup POA Network with clique, 5 Node with Public RPC, everything working fine, but i would like to setup Gas Fee to 25 GWEI automatically Metamask pick this estimation, by Default POA has 1 ...
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592
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Hardhat throwing 'missing revert data in call exception; Transaction reverted without a reason string'
After installing Hardhat's npm package latest version following this brief guide and setting up my first 'sample project', i tried to create a script and deploy a contract on the BSC mainnet. I edited ...
2
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1
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100
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Truffle contract factory test with Javascript
Here is my smart contract source code.
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.9;
contract CampaignFactory {
address[] public deployedCampaigns;
function createCampaign(uint ...
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46
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Can you help teach me how to deploy my Token using this contract
This is the link to Contract gist on Github, it's a dividend-paying smart contract that pays BUSD as rewards.
https://gist.github.com/Vicktron/6650af80e214b3c64eb857fb6343b3a0
This is what happens ...
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1
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205
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Native token Bridge to swap another native token
I have a smart contract on the BSC network that I want to accept other tokens like AVAX, MATIC, ETH, and other EVM compatible tokens. How would one go about letting a user use AVAX but at the end it ...
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