Questions tagged [contract-invocation]
Questions regarding the act of calling or interacting with (a.k.a. invoking) a contract on the Ethereum blockchain by a user or another contract on the blockchain. Includes both local invocation by call and global invocation by transaction.
1,184
questions
1
vote
0
answers
8
views
eth_sendTransaction is not supported. Use eth_sendRawTransaction to send a signed transaction
I'll go straight to the point.
I have a React App, I want to integrate this web with a very simple smart contract, which receives a hash and then saves with an event the timestamp of when it was ...
- 11
0
votes
2
answers
29
views
Is there a way to test whether an external contract implements (or does not implement) a given interface method?
How would you determine whether a given contract implements a particular interface method without reverting?
interface IRandomMethod {
function getUint() external view returns (uint);
function ...
- 125
4
votes
1
answer
47
views
How transaction fee is calculated in case of L2?
In case of L1, the transaction fee is typically calculated as the product of gas price and gas usage, i.e.,
txFee = gasPrice * gasUsage
One such example can be seen in this transaction.
In which the ...
- 1,063
0
votes
0
answers
31
views
How to make a smart contract/ a third party pay for transaction fees?
I'm trying to create a LiquidStacking smart contract where it would be possible to deposit any amount of ETH. Every time the smart contract's balance reach 32 ETH, it creates a BeaconChainDepositor ...
- 11
0
votes
0
answers
48
views
Verifying eth_call Results with Cryptographic Proofs for L1s and L2s
I'm interested in enhancing the reliability of static call requests (eth_call) to Ethereum smart contracts. Currently, the returned data is only as trustworthy as the node or service providing it. ...
- 1,613
0
votes
0
answers
11
views
On-chain or Off-chain: Optimal Calculation for Arbitraging Two v2 Pairs?
I'm currently exploring arbitrage opportunities involving two v2 pairs and I'm wondering whether it's more advisable to compute the optimal amount to trade on-chain or off-chain. What are the key ...
- 99
0
votes
0
answers
29
views
Can my ETH be frozen by Metamask's Validator Staking Contract?
Does MetaMask have the power to freeze my assets?
I'm not an expert but Validator Staking looks to me like a contract interacting with the beacon chain contract.
Does me investing/interacting into ...
0
votes
1
answer
44
views
Transaction Hijacking?
So I created a wallet and sent it some funds then I submitted a few invalid transactions. I approved the correct address for transferring wrapped eth. After the approval my script immediately sent the ...
1
vote
1
answer
47
views
gasLimit argument in ethers.js confuses me
Assume the following:
// Tx1
const realCall = await contract.callMain(secondAddress, num);
const waited = await realCall.wait();
console.log(waited.gasUsed.toString(), ' gas used')
it prints: "...
- 93
0
votes
1
answer
28
views
Does contract logic get executed with a SimulatedBackend?
I am trying to write a test, but I am surprised by an unexpected behavior with the SimulatedBackend.
I am able to deploy the contract, and then call a function. The function runs an internal check, in ...
1
vote
1
answer
84
views
I need help with changing the owner of a contract
I'm trying to assist a client in changing the owner of a contract, but the situation is as follows: He has two contracts, A and B. Contract A is the owner of contract B. He only has access to the ...
0
votes
0
answers
59
views
PancakeSwapV2 router "getAmountsOut" function returns wrong value
I'm struggling with "getAmountsOut" function, which works kinda fine for BNB/CAKE or CAKE/BNB. But it in some cases it just returns straight wrong values.
Code:
public async Task<decimal&...
- 31
0
votes
0
answers
99
views
ERC20 Multisend works on Sepolia Testnet but Fails on Mainnet
I've got a smart contract function that takes an erc20 contract address, an array of addresses and an array of amounts and then sends the each amount to each address of the specified token. I've got ...
0
votes
1
answer
28
views
Can require() be used to revert low level call() that were made before it?
CODE:
(success, ) = contract.call(); // low level call
if (success) {
// do something
}
// instead of below check, can I just use require(condition)?
if (!condition) {
revert();
}
Instead of ...
- 233
0
votes
1
answer
36
views
tokens transfered out after swap in
I am learning ethers.js and try swap tokens via ethers.js, and my transaction succeed buy my wallet had 0 tokens. Then i checked on bscscan and found that after my 'swap' transaction succeed, the ...
- 1
0
votes
0
answers
157
views
Generating input data with Ethers for low level call to Uniswap Router
I'm trying to generate the input data necessary to execute a low level contract call to the Uniswap SwapRouter.exactInput method.
I've done the same for the exactInputSingle successfully but can't get ...
- 152
0
votes
2
answers
45
views
Call a function from another contract, entirely determined by initial contract's function arguments
I would like to have a contract MainContract that can call any other contract functions depending on arguments given a MainContract function. It would look like this:
pragma solidity 0.8.16;
contract ...
- 80
0
votes
1
answer
35
views
How do I add my address to a deployed contract public address using a security exploit? (coding challenge)
I'm working on a coding challenge for smart contract security exploits. I need to add my address to public address (browerr) in the contract. Do I need to create another contract that inherits the ...
- 1
0
votes
1
answer
264
views
error: "Transaction has been reverted by EVM"
I'm fairly new to Solidity and coding overall. I'm going through a Udemy course and I ran into an error which I can't find the solution for.
I deployed a contract on the Sepolia test network from ...
1
vote
0
answers
16
views
Why did my contract read method call get turned into a transaction using gas fees? [closed]
I called a contract read method from my React app using ethersjs but it turned into a tx with gas fees.
See the below tx hash on etherscan:
https://etherscan.io/tx/...
- 33
0
votes
1
answer
36
views
Using the Freeze functionality as a user in the BNB contract
In the BNB contract there is the Freeze and UnFreeze functionality.
As I have understood, this doesn't allow Binance to freeze users’ balances. Instead, it allows any user to freeze and unfreeze their ...
- 1
1
vote
1
answer
62
views
is this how delegatecall works? what other ways are there keep msg.sender the same when a contract is interacting with a different contract? [duplicate]
I recently started development on a personal project, and one of the suggested methods to achieve what i want was using delegatecall. Essentially I have a main contract that the user interacts with ...
- 31
0
votes
1
answer
205
views
simulate a transaction considering another pending transaction
I have the following problem and have hard time to simulate it to get the answer.
Let say I have a 5 WETH tokens.
I sent transaction X with nonce 1 to transfer 5 tokens from Account A to Account B. ...
- 3,217
0
votes
1
answer
36
views
Facing errors with contract invocation ( Unable to access a function stating only owner can access it , even tho I am the owner)
(sorry for structuring the question in a wrong way as I am not sure what term to use precisely) I am facing issue while trying to call the function flip in the program below , I am using chainlinks ...
0
votes
1
answer
111
views
Detect honey pots / rugpulls
I was wondering if there was a way to detect honey pots and rugpulls tokens in python. I'd like to do some sniping, so using api and waiting for their response would make me lose time. I'd like a way ...
- 11
0
votes
1
answer
69
views
Receiving no events in contract receipt web3js
In my contract interaction with web3js I have a
.once("receipt", async (receipt) => {
console.log("receipt:", receipt);
I run this with a firebase function. ...
0
votes
0
answers
502
views
Wagmi throws "Cannot Decode Zero Data" Error when using useContractRead
I am using wagmi with next 13, and trying to call "view" function in my contract.
The function in my contract:
function getAllGrids() public view returns (address[] memory) {
return ...
2
votes
1
answer
151
views
Tool to re-create state of smart contract locally
I would like to be able to simulate transactions with smart contracts based on their solidity source code. The process should be entirely automated.
While I am aware that some tools allow forking the ...
- 21
0
votes
0
answers
23
views
Token Rewards Calculation and Distribution
I'm doing a script to calculate rewards for a handful of addresses (from sensors). The script runs weekly where it takes a bunch of addresses from our DB, cleans the data and calculates the associated ...
- 1
0
votes
1
answer
53
views
Calling a safeTransferFrom of a contract that implements an ERC721Upgradeable interface
I have a contract A that inherits the following contracts:
contract NftTemplate is
Initializable,
ERC721Upgradeable,
ERC721URIStorageUpgradeable,
AccessControlUpgradeable,
...
- 243
0
votes
0
answers
44
views
How would look like calldata for bytes[] calldata argument?
Imagine I have a function with such signature in Solidity:
function doThing(bytes[] calldata arr) external;
how are elements of arr are packed in bytes? I would say that first 4 bytes is bytes4(...
- 1
2
votes
1
answer
85
views
How to access funds if the Gnosis Safe website is shutdown?
Imagine that the Gnosis Safe website and services is shutdown, how can users access their funds?
- 21
1
vote
2
answers
77
views
Malicious smart contract that transfers tokens forth and back
Sorry if my question was already discussed.
Is it possible to implement such a smart contract or contracts that in result can transfer eth or ERC20 tokens forth from ANY to B account and back from B ...
- 11
0
votes
1
answer
146
views
Unable to call functions on a deployed contract through web3py
I have a working private network in which i have successfully deployed a contract using python. I have its address and i can see the deployment in the node log, but i cant call any functions and it ...
0
votes
1
answer
331
views
How to encode arbitrary amount of parameters for encodeWithSignature without adding them to function definition?
Lets says we have Contract A that needs to call Contract B at a certain address which the requirements that Contract A doesn't know the exact parameter structure the function in that Contract B needs &...
- 61
1
vote
1
answer
37
views
Why doesn't this try/catch block catch the revert in `asset.symbol`?
I wrote this Solidity function:
function getAssetSymbol(IERC20Metadata asset) internal view returns (string memory) {
try asset.symbol() returns (string memory symbol) {
return symbol;
...
- 18k
1
vote
1
answer
172
views
Wrapping ETH into WETH via ethers -- WETH coins on my balance won't appear
I'm attempting to wrap ETH on Goerli into WETH by calling deposit function using ethers. Even though several TX already have been confirmed and successfully mined, nothing will appear on my WETH ...
- 115
1
vote
1
answer
1k
views
WEBSOCKETS Provider url for binance smart chain
I have a contract deployed in Binance smart chain. I have written a script that will help me read the events logs from the Blockchain. currently, I tested that with the local hardhat network itself, ...
0
votes
1
answer
41
views
Why is MyCrypto is disabling the Sign Transaction button?
I'm using MyCrypto to execute a function of a smart contract but the sign Transaction button is disabled. I'm using the setting to auto calculate the Gas Limit and its suggesting a limit of 68908 with ...
- 101
1
vote
1
answer
49
views
@openzeppelin/contracts import failed
The issue I am having is when I am trying to compile my contract, I am getting multiple errors for ERC721. As imported ERC721 is importing more contracts, as seen from the errors, the issue is that it ...
- 13
1
vote
1
answer
29
views
calldata usage, difference between the method calling function with calldata
I recently studied optimism, and found that appendSequencerBatch() of CanonicalTransactionChain contract called with calldata. I assumed that this function was called using
0x(functionSelector)+(data.....
- 25
0
votes
1
answer
56
views
Emit is not working on simple Token Factory
I'm using Hardhat 2.12.7, here's my Factory contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.9;
import "./SimpleToken.sol";
contract SimpleFactory {
event Deployed(string ...
- 121
2
votes
1
answer
62
views
What should the input parameter structure look like in validate(touple) function of Seaport contract?
I'm trying to call the validate() method of Seaport but can't find the correct form of inputs, as it always returns the error types/value length mismatch when calling on Etherscan.
I'm calling the ...
- 1,127
2
votes
1
answer
296
views
How does a sweep contract works?
I received an invoice from one of my clients and they gave me a payment address to:
https://etherscan.io/address/0x4b05e01a0a2dd41071172d0c6325349921deaf2a
I'm curious to how this works as I am ...
- 4,800
1
vote
2
answers
150
views
How can I add consumers to a Chainlink VRF2 subscription with an external smart contract?
When I try to add a consumer to my VRF2 subscription via the Subscription Manager, the transaction completes successfully. This also works when interacting with the chainlink contract directly on ...
- 179
5
votes
4
answers
5k
views
Call smart contract method with ethers.js version 6
I was successfully using the version 5 of ethers.js so far and I'm now migrating my code base to version 6.
I tried the following code to call a method on my smart contract that is supposed to return ...
- 151
1
vote
1
answer
19
views
My payout function to lottery winners is failing. I'm storing the winners in an array and attempting to payout but getting reverts
the code:
function payoutWinners() public payable {
require(msg.value >= payoutOwed, "send more than what is owed");
for (uint i = 0; i < winningAddresses.length; ...
- 11
0
votes
2
answers
314
views
How to interact with a contract that requires a uint256 value? The input I want to give is "5"
I have the following contract function. I want to input 5, but it requires it in the format uint256. How do I represent this in uint256?
And is there a way to interact with this contract function ...
- 4,800
0
votes
2
answers
1k
views
Can you fetch the whole transaction history of specific contracts somewhere?
I know you can validate the data of specific tx hashes using web3js or the etherscan api.
But is there a service which allows to query all transactions performed by or connected to a specific smart ...
- 179
0
votes
1
answer
34
views
Retrive data from chainlink node
in APIConsumer contract on chainlink docs (Any API)
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;
import "@chainlink/contracts/src/v0.8/ChainlinkClient.sol";
import "@...
- 338