Questions tagged [gas-estimate]
The gas-estimate tag has no usage guidance.
40 questions
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What are the limitations to estimateGas and when would its estimate be considerably wrong?
web3.eth.estimateGas and JSON-RPC estimateGas can be used to see how much gas should be specified for a transaction, before crafting the transaction.
Since it is an estimate, are there any ...
eth♦
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19
votes
2
answers
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how to estimate gas cost?
I have a function that iterate through an array, which could cost a lot of gas. But I still want to test out the estimate gas cost, then decide if I should maintain the design or not.
function ...
- 319
23
votes
5
answers
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How to estimate gas at contract creation/deployment to private ethereum blockchain
What I have done
a) When I use web3.eth.estimateGas to estimate the cost of a contract creation constructor with no parameters, the estimate is correct.
b) If the contract is already deployed then ...
- 871
18
votes
1
answer
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What happens if transaction runs out of gas before transaction completes?
As gas cost can only be estimated until the transaction is executed against the actual contract state at the time of execution on the blockchain, what happens if transaction runs out of gas before the ...
- 5,400
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votes
3
answers
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Getting infinite gas estimates for simple functions
I am testing out solidity in remix ide using simple contracts. This is the contract that I wrote:
contract mortal {
address owner;
function mortal() {
owner = msg.sender;
}
function kill(){
...
- 183
3
votes
2
answers
1k
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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(),
...
- 26.2k
9
votes
2
answers
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How to estimate the cost to call a Smart Contract method?
After succesfully deployed this Smart Contract on Ethereum testnet
https://testnet.etherscan.io/address/0x27c042342C9ba937214117e11A4970A6145034cB
is it possible to calculate how much gas is going ...
8
votes
2
answers
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Infinite gas estimation from solc for simple function
Here is a simple Solidity contract:
pragma solidity ^0.4.16;
contract Test {
uint[] array;
function testGasEstimation() public {
array.length = 1;
}
}
Here is the output of ...
- 11k
1
vote
2
answers
2k
views
How to estimate gas for a function without any input parameter?
How to estimate gas for a contract function that doesn't take any input parameter bu changes state?
For eg,
function buy() returns (uint amount){
amount = msg.value / buyPrice; ...
- 8,076
6
votes
2
answers
6k
views
How can I estimate price of data storage? [duplicate]
I'd like to make estimations of the cost of an application, and one of the things I need is the price to store n kB of data on a contract. In ether and in USD.
Where could I find rates or prices of ...
- 1,536
5
votes
1
answer
1k
views
Is it possible to calculate the gas costs of a transaction exactly upfront?
In the Ethereum wallet there are the estimated gas costs. Why is it only an estimate? Is is possible to calculate the gas costs precisely upfront?
- 7,636
2
votes
1
answer
372
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,
...
- 26.2k
0
votes
2
answers
323
views
Will same contract consume different gas in different network?
I have a contract deployed both in test and main network and if i execute same method with same parameters, will gas used differ?
- 65
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votes
4
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Estimate gas price with ethers.js
I'm looking to estimate transaction fees in an application. In order to do so I need to estimate the current gas price before I execute the transaction.
I see web3.js has a getGasPrice method:
https://...
- 606
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votes
3
answers
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How to whitelist up to 50k addresses in a single contract?
What is the best practice in whitelisting a large amount of addresses in a contract. For example, if I wanted to include 50k addresses into a mapping that will reflect true for only the 50k addresses, ...
- 327
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votes
2
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Correct syntax for estimating gas cost of a function in Web3?
Suppose I have the following function:
function SetMessage (bytes32 _message) returns (bool success) {
message = _message;
return true;
}
Which might be called in Web3 as follows, for ...
- 1,358
8
votes
1
answer
361
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 ...
- 266
7
votes
2
answers
4k
views
Mist Testnet error "it seems this transaction will fail"
I am very new to Ethereum, and just working through some early tutorials using the testnet. My version is up to date; the blockchain is also up to date; and I have only one account in the keystore, ...
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6
votes
4
answers
23k
views
how to estimate gas limit when using web3.eth.sendSignedTransaction
I am using web3 to transfer tokens by using web3.eth.sendSignedTransaction.
When I am setting the parameter rawTx like
var rawTx = {
"from" : walletbase,
"nonce" : ...
- 83
6
votes
1
answer
1k
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Gas estimation for mapping updating with web3js
The gas estimation for contract deploying with web3js will look like:
var res = web3.eth.estimateGas({
from: web3.eth.defaultAccount,
data: contractByteCode
});
For example, I have the ...
- 2,037
5
votes
1
answer
2k
views
How to minimize gas consumption during contract creation
I have trouble deploying a contract to the main network and I believe this is due to high gas consumption.
An earlier version of the contract worked on the main network. The current version works in ...
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votes
3
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How do you estimate the gas cost of any arbitrary function in Remix IDE?
I've found plenty of information on how to do this using Truffle and Web3, but nothing regarding how to achieve this in the Remix IDE.
Examples would be very much appreciated.
- 425
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MetaMask incorrectly estimates 100,000 gas for ERC20 transfer. Why?
MetaMask is incorrectly limiting the gas limit estimate to 100,000. This is actually a rather complex "transfer" that will need about 145,000.
Why does MetaMask limit ERC20 .transfer() to ...
- 55.6k
3
votes
1
answer
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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, ...
- 295
3
votes
2
answers
310
views
Does execution of same function in a contract uses different amount of gas each time it's executed
1-Does execution of same function in a contract uses different amount of gas each time it's executed?
2-Also if same function (for eg, transfer() function) is written in two different contracts, ...
- 8,076
3
votes
2
answers
5k
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Ethers js estimateGas() without needing ETH in account
I am trying to estimate the gas used for a uniswap transaction. I am able to perform this on the Kovan testnet however when I try and run the same script on the mainnet it raises an error, "Error:...
- 55
3
votes
1
answer
411
views
Gas cost tests: Sending a transaction to a new address is more expensive?
A friend and I were thinking about transaction costs, is there any attached cost to send a transfer to a new address that has not been stored on chain before? So we started digging.
First off we ...
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votes
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I set a 3 gwei for gas price. Now my transaction has been pending for 48+ hours now. But blocks aren't even full!
I tried to set a gas price of 3 gwei for interacting with a smart contract. Now the transaction is pending for 48+ hours.
If the blocks aren't full, why dont the miners pick it up?
I can bump the fee ...
- 4,810
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votes
0
answers
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views
Is gasleft() the best way to manage big loops in solidity?
I'm developing an Smart Contract that has to iterate through an undetermined size list of ERC20 tokens, and make a swap for each token. I'm aware that you cannot loop an undetermined size list, ...
- 1,998
2
votes
1
answer
937
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 ...
- 1,360
2
votes
1
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How to caculate/estimate Gas Limit and Gas Price based on current state of the ether network?
Ethgasstation and similar websites estimate proper Gas Price based on current state of Ethereum network. Is there any way of using working with Geth/web3 to estimate proper Gas Price? and similar to ...
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votes
1
answer
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Getting 'base fee exceeds gas limit' on a transaction which requires a small amount of gas
I have the following contract:
pragma solidity ^0.4.24;
contract MyContract {
address public owner;
bool public unlocked;
constructor() public {
owner = msg.sender;
...
- 26.2k
1
vote
1
answer
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views
Different gas cost for same operation?
I'm running a smart contract locally on TestRPC and using MetaMask to interact with it. Repeatedly calling the same function with the same parameters seems to accumulate different gas consumption (...
- 175
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vote
1
answer
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"Gas estimation failed" on Ropsten using MetaMask!
I'm testing a smart contract using Remix, MetaMask, Ropsten.
Yesterday I developed my contract on Ropsten network and everything goes in the right way.
Today I was developing the SAME contract code, ...
- 101
1
vote
1
answer
67
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 ...
- 147
0
votes
1
answer
417
views
Estimating Gas Cost for Smart Contract Deployment Using Foundry
I'm trying to estimate the gas cost for deploying a smart contract using Foundry. Can someone provide guidance on how to do this accurately?
- 141
0
votes
1
answer
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Question about Gas and Gas Price
In my transaction: gasPrice: 210000
blockHash: "0x69bd71736f2a5d2c83919a0de81a7de0b6b690bb6bdda3acff254d5c68f634bc",
blockNumber: 3178,
from: "0xc8caa71c16299b40b8579742a27ee53162886040",
gas: ...
- 886
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votes
0
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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
0
answers
77
views
How can I measure gas in solidity to increment a user's balance according to the amount of gas spent to call the function? [duplicate]
I have a function that I am calling and based on the logic of that function and how much gas it spends to execute the function, I want to increment a user's balance to reimburse the user for the gas ...
- 123
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votes
3
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How can I get the current ETH gas fees in python
I am trying to make a python program that gets the ETH gas prices. I am trying to avoid selenium scraping because I am using this for a discord bot. Does anyone know any good python APIs I can use?
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