Questions tagged [gas-estimate]
The gas-estimate tag has no usage guidance.
170
questions
0
votes
1answer
36 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
32 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
23 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
41 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
32 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
56 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, ...
0
votes
2answers
98 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
35 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
192 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
74 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
37 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
22 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. ...
0
votes
1answer
223 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
819 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
30 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
14 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
116 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
52 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
43 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, ...
0
votes
0answers
14 views
Can web3js accurately estimate a transaction that includes an external call?
Can web3js accurately estimate a transaction that includes an external call? For example, will it be accurate in estimating:
(bool _success, bytes memory _response) = _to.call.value(_value)(_data);
...
3
votes
0answers
70 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
30 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
36 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
31 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
37 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
115 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 ...
1
vote
1answer
74 views
How to calculate “gas” and “gasPrice” when referring to ethgasstation.info when sending transaction via web3js?
I'm using web3js to issue token which has a name and description. I'm using ropsten testnet.
Here's my tx.
const tx = {
from: walletAddress,
to: contractAddress,
gas: 4700000,
...
0
votes
1answer
78 views
Calculated Gas Costs of Contract execution
I have a smart contract that maps a string to a string value and stores it on the Blockchain. I want to analyse the Gas Used by Transaction. One time the execution consumes 92,843 Gas (https://rinkeby....
0
votes
1answer
1k views
Gas estimation failed: gas required exceeds allowance or always failing transaction
I have two contracts one for defining token and other for crowdsale. I am using remix ide.
pragma solidity >=0.4.22 <0.6.0;
contract owned {
address public owner;
constructor () public {
...
0
votes
0answers
44 views
Find exact gas limit requirements for executing fallback function logic
I have a certain function logic coded for fallback function. This logic also contains some delete operations of storage variables (delete storeVarX;) due to which there might be some gas being ...
0
votes
0answers
56 views
Why does my private network transaction use a different amount of gas than my mainnet transaction performed immediately after?
I am forking the mainnet from my own geth node with ganache-cli --fork option. Immediately after the fork, I simulate a transaction to a contract on the forked, private network. I then immediately ...
0
votes
0answers
71 views
JSON RPC get this error “Request have return error: gas required exceeds allowance or always failing transaction”
i'm trying to do a simple transaction for a token but i keep getting following error for estimate gas limit :
"Request have return error: gas required exceeds allowance or always failing transaction"
...
0
votes
1answer
80 views
Multi token transfer issue [closed]
In exchange contract,With multi token when I call approve function from exchange contract, nor my address and spender get approved. Instead only the exchange address and spender gets approved.
Its ...
1
vote
1answer
143 views
ERC721 - How is gas worked out with TokenID?
ERC721 - I have minted a tokenid (tokenid=444) and my account owns it. When I try and transfer it, I get this message stating the gas cost is the normally calculated one and the total cost has the ...
1
vote
2answers
368 views
How to estimate ERC721 mint transaction?
My contract;
contract My721 is ERC721Full, ERC721Mintable, Ownable {
constructor() ERC721Full("My721", "MY721") public {}
function mintUniqueTokenTo (address _to, uint256 _tokenId, string ...
0
votes
1answer
61 views
Gas Estimation questions
I am little confuse in the concept of Gas Estimation and price. When i add new user i get popup through metamask for the transaction amount and gas used which is totally fine.
I checked my code in ...
4
votes
2answers
735 views
web3.eth.getGasPrice() always return 1GWei
For estimate transaction cost, I use web3.eth.getGasPrice() function. The return callback value always 1Gwei(1,000,000,000) in ROPSTEN.
web3.eth.getGasPrice(function(error, result){
console.log(...
1
vote
0answers
112 views
Is there a way to calculate gas usage of external function call?
I have an external view function which has an iteration loop. If the contract's totalSupply gets bigger, then the iteration time will grow as well. I'm testing on rinkeby right now, but when I launch ...
1
vote
1answer
691 views
Estimate Gas For Smart Contract Always Fails
I have deployed a very simple contract to the Ethereum blockchain to be able to split a payment across two different outputs.
pragma solidity ^0.5.0;
contract MoonTrade
{
function multiSendETH( ...
1
vote
0answers
25 views
function gas calculator and function gas padding
not sure if this is possible, but I was wondering if one function can calculate the gas cost of another function?
Also can a function run a series of computations to match the gas cost of the ...
0
votes
1answer
2k views
Error: gas required exceeds allowance or always failing transaction when trying to estimate gas
I am trying to run estimateGas function on mainnet like the following to send erc721 cryptokitties from one account to another:
data.from = <my address>
data.to = <destination address>
...
2
votes
0answers
48 views
What Web3JS method do I call to know what value to use for the gas price with sendSignedTransaction?
I am using Web3JS 1.0+ to send transactions to my smart contract.
I've been using the following constant for the gas price in my code that I got a long time ago from a tutorial. What is the "...
4
votes
1answer
227 views
Can't debug transactions that fail during the Web3.js estimateGas() call? No Tx Hash
NOTE: I am doing my work with the Ganache v1.2.2 GUI client on a Linux Ubuntu 18.04 station.
There are many revert errors that happen during the estimateGas() call that precedes the actual Web3.js ...
1
vote
1answer
115 views
What should be optimal gas limit and gas price for 80 addresses airdrop?
This is my airdrop function:
mapping (address => bool) public airdrops;
function airdropTokens(address[] _recipient, uint256[] _tokens) public onlyOwner{
uint airdropped;
for(uint256 i = 0; i< ...
2
votes
1answer
39 views
Do I pay any fee to the miner if I call a non-constant function, when no state variable is changed?
Suppose I have a non-constant function which changes a state variable under some condition.
In other words, the function may sometimes change this variable and sometimes leave it as is.
Will I pay ...
2
votes
1answer
43 views
Why use different gas?
I have this contract with this functions, why each use different gas amount?
pragma solidity 0.4.24;
contract Foo {
//transaction cost: 21471 gas
//execution cost: 199 gas
//total cost: 21670 ...
2
votes
1answer
97 views
Sending a transaction - can I assume that when the 'data' field is missing, the 'gas' field should always be 21000?
I have implemented a function for transferring ETH from my account to another account:
async function transfer(to, value) {
let options = {
from : PUBLIC_ADDRESS,
to : to,
...
0
votes
1answer
98 views
How is gas adjusted for a transfer in solidity?
I am using Remix with Metamask on the Ropsten test system, and when I try and transfer Wei I get a gas error. I tried a few combinations but there are various errors relating to gas.
Has anyone any ...
4
votes
2answers
389 views
Do intermediate memory variables cost gas?
Example without an intermediate variable:
uint startTime = 9;
uint allowedTime = 7;
require(now > startTime + allowedTime);
Example with an intermediate variable:
uint startTime = 9;
uint ...
2
votes
1answer
33 views
Gas used for the same deterministic operation is different
standard ICO function which exchanges Ether to ERC20 token balance.
Call 1, used 49431:
https://ropsten.etherscan.io/tx/0x6671c8fd39d195b09868d914d80f0e884e42259c7346b69afb483f2e18fae263
Call 2, ...
