Questions tagged [gas-estimate]
The gas-estimate tag has no usage guidance.
194
questions
0
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0answers
22 views
How to optimally use map of maps in solidity?
I have the code:
struct A {
mapping(uint256 => uint256) b;
}
mapping(uint256 => A) public a;
and I want to have the following code as gas efficient as possible:
a[key_a].b[key_b] = a[...
0
votes
1answer
25 views
Tx stuck even after using gasestimation for gas limit
I am trying to sign a manual transaction using ethereumjs-tx to interact with a smart contract.
This is how I am getting my gaslimit, nounce and data for the params
var GAS = await cont.methods....
1
vote
1answer
109 views
How can I calculate the gas fee of a swap on Uniswap?
According to gas tracker on Etherscan the average gas price is 212 gwei and the average Uniswap swap estimate is $70.26 which implies that the gas fee is around 201101.
To my knowledge swap gas fee is ...
0
votes
0answers
29 views
EstimateGas reverts, actual transaction works
On Rinkeby I'm trying to estimate gas and send ERC-20 Weenus tokens.
If I shove the necessary data into an estimateGas call to Infura Rinkeby it returns with an error of execution reverted.
{
&...
0
votes
0answers
24 views
Truffle test doesn't recognize estimateGas function
I'm trying to test my contracts using Truffle and Ganache, but I'm facing some problems with some functions. When I call a non view function, I'm getting the error "out of gas". Moreover, if ...
0
votes
1answer
26 views
Deciding Gas Pricing
Anyone know how curve fi and metamask fetch the average gas price for the transaction and how they provide the slow and fast option? I just want to know which third party they use to get these info.
1
vote
1answer
17 views
Does a virtual function increase gas usage?
Suppose we replace every expression balances[user] with a call myBalance(user) where
mapping(address => uint256) balances;
function myBalance(address user) returns (uint256) virtual internal {
...
0
votes
1answer
22 views
Can gasLimit be infinite?
Assuming I have enough Ether, can smart contracts be executed no matter how complex they are as long as I specify a large enough gasLimit?
Hope you can give me some hope, thanks!
0
votes
1answer
1k views
I'm getting “invalid opcode: opcode 0xfe not defined”, when trying to estimate the gas fees
I'm trying to estimate gas fees of a contract that I'm about to execute. My code is as follows.
import Web3 from "web3";
const web3 = new Web3();
const estimateGasLimit = async (
...
5
votes
0answers
31 views
Deploy gas issue for require reason string
I found a strange case and didn't find out why.
...
modifier onlyMaster() {
require(msg.sender == master || msg.sender == developer, "caller is not the master");
_;
}
...
...
0
votes
0answers
21 views
amount of gas used in receive and fallback functions in truffle tests
I have a contract that is written in solidity ^0.6.4 and has a simple implementation of reverting funds when someone directly transfers some eth or calls an unhandled function. Now it appears to be ...
1
vote
0answers
57 views
Understanding eth_estimateGas with regards to gas price, and current mempool
Does anyone have a detailed understanding of how eth_estimateGas works with regards to gasPrice and the current mempool state?
I have historically seen some really odd behavior when using ...
0
votes
1answer
39 views
About calculating gas' cost
I was reading an old post: How to get the actual Gas price?
If the gas price currently is, for instance, 14 gwei and I have a transaction cost of 80000, does it mean the price of my transaction is 14*...
0
votes
1answer
227 views
Default gas limit set by web3 is unreasonably high?
I am trying to learn and understand solidity/defi by creating some copies of current popular protocols; I've created a small copy of the Curve Dai strategy from harvest finance, but I'm getting really ...
0
votes
1answer
34 views
Is it possible to get the gas fee before sending an ETH?
Is there a way or api endpoint to calculate the gas fee before sending the ETH? My client requirements is to calculate the gas fee before sending an ETH to other user.
I can only get the gas price ...
0
votes
0answers
14 views
What determines how much gas is required when transferring an ECR-721 non-fungible token? [duplicate]
When transferring an ECR-721 token, what determines how much gas is required? Is it written into the contract of the ECR-721 token? Does it depend upon how it was transferred (e.g. cryptokitties.com ...
1
vote
0answers
18 views
I don't know why my contract have a problem. Gas estimation and Gas exceeds Problem [closed]
pragma solidity >=0.4.24 <=0.5.6;
contract Indian {
mapping (address => uint16) myGame;
address public owner;
constructor() public {
owner = msg.sender;
}
...
0
votes
0answers
9 views
For Ganache and BuidlerEVM I have different estimated gas
For Ganache and BuidlerEVM I have different (several times) estimated (by Ethers.js) gas for the same computation.
Is it a bug? Isn't the Ethereum standard specifying particular gas amount for every ...
1
vote
1answer
53 views
how to use eth_estimateGas for erc20 tokens?
i wanna calculate estimate gas for BNB, PAX, LINK
i have used geth 1.8 and web3.php
my contract data that used (i found them from etherscan):
<?php
/**
* @var array
*/
public ...
1
vote
2answers
118 views
Can miner himself add a transaction with a zero gas price?
In general it doesn't make any sense to send a transaction with zero gas price. Probably it will be pending forever. But what about miner - can he:
Send some transaction with zero gas price (so the ...
0
votes
1answer
121 views
How to refund gas to the smart contract caller? (What is the number?)
I have this function:
function setAccount(BaseUBI _ubi, address _user, uint256 _startTime, uint _esiaID, bool _setToZero) external {
uint256 _refund = (gasleft() + 0/*FIXME*/) * tx....
1
vote
0answers
50 views
Execution erorr: Invalid opcode on estimateGas | Possible unhandled promise rejection
pragma solidity ^0.5.0;
I get invalid opcode error when trying to estimate gas needed for my transaction from react-native using the following line of code:
const gasAmount = await contract.methods
...
0
votes
1answer
32 views
mining transaction in private blockchain
I am new to the blockchain issue, and I have read about it, but I had these questions.
When I actually implement a private Blockchain on every transaction it costs a certain gas. Who pays for this ...
0
votes
0answers
92 views
Insufficient funds for gas * price + value in Ropsten
I write API for smart contract but its shown error "Insufficient funds for gas * price + value"?
My try
I have increased my address balance but it's showing the same error.
I have changed my ...
0
votes
1answer
275 views
How to estimate gasLimit of ERC20 contracts in web3.php project?
I am using web3.php project in my Ethereum based project. A part of this project is sending ERC20 tokens, and in this regard, I need to estimate gas limit of transaction. For this purpose, I found the ...
0
votes
1answer
557 views
How to fix “gas required exceeds allowance (9998602) or always failing transaction” web3js error on mainnet?
I'm getting gas required exceeds allowance (9998602) or always failing transaction error on transaction.estimateGas() on mainnet, but it's working ok on kovan.
What is the reason of this error? Is ...
0
votes
0answers
127 views
How to correctly account for transaction costs when swapping from one ERC-20 token to another using for example the Kyber network?
If I for example have 5 KNC (an ERC-20 token) and would like to swap them for x amount of DAI (another ERC-20), this would on the Kyber network, as far as I understand, be achieved via two conversions:...
0
votes
0answers
105 views
intrinsic gas too low in Ropsten
I am trying the sendSignedTransaction in Ropsten and I assigned the value of gas limit and gas price:
gasLimit: web3.utils.toHex(21000),
gasPrice: web3.utils.toHex(web3.utils.toWei('10', 'gwei'))
...
1
vote
1answer
61 views
gas estimate in loop
I have two contract. I call function placeBid in other contract and i have warning gas estimation. help me. thanks. Can i call function which use gas in loop through other contract? How i can get ...
0
votes
1answer
49 views
Smart contract transaction takes different amounts of gas on different platforms
I have an ERC-20 token contract on which I want to perform some testing on a local chain. I got my chain setup, contract deployment and testing scripts ready on my Windows machine. However, since I ...
0
votes
1answer
144 views
How to estimate gas in an address with no ETH at all
Say I have received an ERC20 token in my address. Such address has no ETH and no other tokens except the one I just received. If I try to estimate the gas cost of sending the token from that address, ...
1
vote
3answers
237 views
Solidity 0.6.1 Receive Fallback Forwarder reverts due to insufficient gas
I am playing around with Solidity 0.6.1 and trying to build a simple funds forwarder. So ETH is sent to the contract and it sends the funds to another address.
I deployed it to Ropsten. But every ...
0
votes
0answers
44 views
gas estimation fails when trying to run a recursive function? Is there an alternative?
I have been trying to traverse a graph kind of data structure and the only way to do this is by using a recursive function is what I feel. So, now when I try to execute my contract code in remix it ...
1
vote
1answer
610 views
Error: Returned error: The execution failed due to an exception. @ web3.eth.estimateGas
I am having problem using bignumber.js with web3:
const sender = '0xss';
const recipient = '0xxx';
const amount = 1000; // have to use Bignumber for more than 1000
const decimals = 18;
const ...
1
vote
0answers
188 views
Gas estimation errored with the following message (see below). The transaction execution will likely fail
When I try to excute the deposit function it shows Gas estimation errored with the following message (see below). The transaction execution will likely fail. Do you want to force sending?
execution ...
2
votes
1answer
50 views
Can I estimate the total gas limit of several dependent transactions?
Assume two dependent transactions A and B. Transaction B depends on transaction A and will fail if transaction A has failed.
I would like to estimate the gas limit required for the success of both ...
1
vote
1answer
25 views
Explanation for small variation in gasUsed while recursively deploying same contract
https://github.com/christianlundkvist/simple-multisig/blob/master/contracts/SimpleMultiSig.sol
I'm deploying the above contract recursively and I find that the gasUsed varies by specifically 12 gas. ...
1
vote
1answer
2k views
ethers.js - estimating gas limit
Using the ethers.js library, how can I determine the gas limit when sending a transaction to a contract or deploying a new contract?
0
votes
4answers
2k views
Gas estimation failed - remix
I am trying to figure out what is wrong with the following code as it does deploy successfully on remix.
pragma solidity ^0.5.11;
contract MyContract {
// Storage
address contractOwner;
...
0
votes
1answer
44 views
gas usage for a large loop
How expensive are loops in solidity? (in terms of gas usage).
I need to loop through ~1000 wallet address, and send each of them some tokens.
my code:
struct User {
uint32 frozenAt ;
uint ...
0
votes
1answer
32 views
Why are all “safe low” transactions mined eventually?
On the website ethgasstation.info you see the current fees for fast, standard and safe low transactions, assuming that there are always more safe low transactions waiting to be mined than standard or ...
2
votes
1answer
258 views
Does using a very high gas limit somehow get your transactions executed slower?
I'm executing transactions on mainnet with a NodeJS script:
async function send(web3, transaction, destAddr, gasPrice, privateKey) {
const options = {
data : transaction.encodeABI(),
...
1
vote
1answer
66 views
How can I reduce the gas price for the fallback function?
Below is my fallback function for ethereum. It currently require 91000 gaslimit which is way more than 21000. Metamask always starts the transaction with 21000 gas stipend due to which transaction ...
0
votes
1answer
82 views
Get gas limit beforehand with Web3
I know that web3 exposes a function to estimate gas limit, but is it accurate when sending to a contract?
AFAIK the amount of gas I'm gonna need if sending to a contract depends on the contract code, ...
4
votes
0answers
89 views
Does 'estimateGas' behave the same on Ganache and on mainnet?
I noticed that estimateGas behavior in Ganache has changed:
In version 6.4.1, it throws an exception if exceeding the gas-limit.
In version 6.5.1, it returns the estimation even if exceeding the gas-...
0
votes
1answer
34 views
Different between gas and gasLimit keys when executing transactions
Below is the code that I'm running. When I entered "gas" and "gasLimit" as the keys, both worked. Why is that? What does "gas" represent? And what is the optimum amount of gasLimit should I use (...
1
vote
1answer
39 views
Block Gas Limit Doubt
Suppose i have a loop.
Here user is a struct of which player is an address.
address[] memory addrs = new address[](n);
for(uint i=0;i<n;i++){
addrs[i] = user.player;
}
return addrs;
This is a ...
0
votes
1answer
39 views
How expensive is it to manipulate the gas price?
Imagine that an evil billionaire decided to make Ethereum hard to use by making the gas very high. I'm wondering how expensive this would be to do for various timescales.
For example, manipulating ...
0
votes
0answers
60 views
How to handle estimate gas cost error?
I am programming a button for a transaction which shall only appear if the transaction is possible. Therefore, I am using the following code
contract.methods.function(parameters)
.estimateGas({...},...
5
votes
1answer
149 views
Why does gas cost explode with more than 7 variables in a struct
I'm assuming this has to do with Ethereum's 7 variable stack limit but in the following code test
struct TestStruct5 {
uint8 m_nOther1;
uint8 m_nOther2;
uint8 m_nOther3;
uint8 ...
