Questions tagged [gas-estimate]
The gas-estimate tag has no usage guidance.
0
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0answers
17 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
87 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
12 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
33 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
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1answer
43 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
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0answers
15 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
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0answers
26 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
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0answers
26 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
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1answer
56 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
43 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 ...
0
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0answers
81 views
Transactions always fails on POA sokol testnet blockchain
POA Sokol is a ethereum like testnet blockchain. I am using ether.js to make a contract call . The eth_estimateGas method in testnet gives this response but works in mainet:
{
"jsonrpc": "2.0",
...
1
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2answers
96 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
34 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 ...
3
votes
1answer
112 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
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0answers
65 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
218 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
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0answers
21 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
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1answer
297 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
26 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 "...
3
votes
0answers
111 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
69 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
35 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
25 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
60 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,
...
4
votes
2answers
167 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
18 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, ...
7
votes
3answers
206 views
Composition Over Inheritance - Gas Efficiency
In OOP languages, composition over inheritance is a well-known best practice. Solidity is an OOP language too but there is also the gas efficiency issue.
Question is, in Solidity, how do composition ...
0
votes
1answer
62 views
Smart contract's function work on testnet but don't work on private network
I have been created a smart contract (ERC20 implantation). The contract run great om testrpc, ropsten and rinkeby but i want to use it in a private network.
When the contract deployed in the private ...
1
vote
0answers
31 views
Gas cost of adding an item to a class-level (storage) array
I would like to make sure that the gas cost of adding an item to a (storage) array is constant, i.e., not dependent on the length of the array.
To my understanding, the relevant EVM operation is ...
1
vote
1answer
26 views
Why aren't costs “advertised” or at least knowable so funds aren't lost?
I'm admittedly new to all of this, but as I learn about the transaction model, it seems to be a confusing business model at the very least. I can understand that the price of gas fluctuates or can be ...
2
votes
1answer
49 views
Is there a Gas Cost profiler
I am trying to figure out what part of a complicated smart contract transaction is responsible for the cost. I was wondering if there is already a tool for that. Ideally it would spit out you are ...
1
vote
0answers
24 views
Vyper OPCODES gas estimate at compile time
I am trying to dissect Vyper at lower levels to understand how the gas estimates are generated. I tried following the yellow paper and I searched every single line of the compiler but I can't get it ...
0
votes
2answers
292 views
How to optimize the gasPrice and gas options in a contract send() function? [duplicate]
There are many questions and answers about estimating the amount of gas consumed. This question is about what to do with this estimate.
What values should we actually provide to gas and gasPrice in ...
1
vote
1answer
120 views
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 ...
1
vote
1answer
22 views
Loop with upper bound of iterations / loop variant
Is it possible somehow to create a loop that solidity will recognize as having an upper bound of iterations for gas estimations?
Something like a loop variant in Eiffel (https://www.eiffel.org/doc/...
0
votes
1answer
348 views
How to estimate gas cost for contract method using geth
I want to estimate a contract method gas cost using geth. I understand there is no direct way using geth as in the web3 libs. But I don't understand what is the second argument needed and how I can ...
1
vote
1answer
297 views
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;
...
1
vote
0answers
37 views
What's the point in the 'gas' parameter passed to function 'signTransaction'? [duplicate]
I am using web3.js v1 in order to sign and send transactions:
async function signAndSend(transaction) {
let options = {
to : transaction._parent._address,
data: transaction....
1
vote
2answers
218 views
Measuring the efficiency/performance of a smart contract presented as an algorithm
I am trying to theoretically analyze the expected performance of a smart contract presented in the form of an algorithm which consists of multiple functions.
What is the best way to measure the ...
1
vote
1answer
275 views
“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, ...
0
votes
1answer
515 views
Error in Ethereum Wallet:“Couldn't estimate gas, resorting to default parameters. Transaction is likely cheaper than the estimate”
I am using ethereum wallet for deploying contracts in my private blockchain. But whenever I try to send a transaction in my ethereum wallet it shows an error that says, "Couldn't estimate gas, ...
0
votes
1answer
97 views
Question about Gas and Gas Price
In my transaction: gasPrice: 210000
blockHash: "0x69bd71736f2a5d2c83919a0de81a7de0b6b690bb6bdda3acff254d5c68f634bc",
blockNumber: 3178,
from: "0xc8caa71c16299b40b8579742a27ee53162886040",
gas: ...
0
votes
1answer
60 views
estimateGas doesnt match with actual one
I have deployed erc20 contact in Robsten network :
https://ropsten.etherscan.io/token/0xa93d83709a1b35f67b30e7400b200690aa51859a?a=0x2c5253b9055cfd3ac7a2d352934fb5c45f667367
Code can be found here (...
1
vote
0answers
48 views
Why does address.transfer(amount) cost the same when sent to a new or used address?
In the Ethereum yellow-paper, it's specified that creating a new account costs 25000 gas (Appendix G, entry for Gnewaccount).
We can see this if, for example, we call a function that makes a transfer:...
2
votes
1answer
59 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 ...
1
vote
1answer
102 views
How to calculate the costs of storing data in a contract? [duplicate]
Lets say, I want to create a smart contract that can receive a record of data per hours, e.g. hourly rates of ETH/EUR. These data would be stored in an array.
What would each transaction cost me and ...
0
votes
1answer
58 views
Calculating a minimum entry fee for a game based on typical minimum gas requirements?
I am creating a dApp that is a game where players compete for the prize pool and that pool is built from the sum of all the entry fees payed by the player at the start of the game. The player that ...
1
vote
1answer
112 views
How can the cost of changing 2 state variables and emitting 1 event reach 50K gas units?
I have this contract:
pragma solidity ^0.4.23;
contract Test {
event Event(address indexed wallet);
mapping (address => bool) public authorizedWallets;
uint256 public ...
0
votes
1answer
324 views
Error: `Invalid JSON RPC response` when running estimateGas on Infura
Why am I getting an error when doing a gas estimation on infura. I am using web3 v1.0 and here is my code:
let Web3 = require('web3');
var web3 = new Web3(new Web3.providers.HttpProvider('http://...
2
votes
1answer
50 views
How does ether transfer processed [duplicate]
I want to understand deeply how ether transfer processed and how 21000 of gas determined. Is this a simple constant fee of the transfer transaction or ether transfer transaction is the some predefined ...
