Questions tagged [eth-call]
Either the RPC method eth_call, or calls invoked from code, such as using call in Solidity, the formatting of data for calls, and data returned by making calls. For the latter, also see [tag:contract-invocation].
54
questions
0
votes
2
answers
16
views
How to optimally display over 500k EOA wallets' daily balances spanning three years back?
I would like to display over 500k EOA wallets' daily balances spanning three years back and wonder if there is a more efficient method than using eth_call and balanceOf 500k times per day for three ...
0
votes
1
answer
14
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
0
answers
27
views
Can eth_estimateGas estimate gas for past blocks?
In my understanding, the eth_estimateGas json rpc method can currently only be used to estimate how much gas would be needed for a transaction based on the current/latest state of the blockchain.
...
- 1,408
1
vote
1
answer
40
views
Do interface functions revert on failure?
I was wondering if interface functions automatically revert the whole transaction on failure or not?
Let's say I want to call the sync() function of a liquidityPair, which usually returns no boolean:
...
- 185
0
votes
0
answers
144
views
State override with geth
I'm working on a generalized sniping bot, which spots liquidity additions on uniswap v2.
I need to know if the token i want to buy is a scam or not, so i would need to do some checks using eth_call() ...
- 11
0
votes
1
answer
23
views
Does a blank space matter? - (bool sent,)
In terms of sending ETH from a contract, if only the boolean is needed and the data gets omitted, I always see two different versions.
Some people write it with a blank space (bool sent, ) and some ...
- 185
0
votes
0
answers
222
views
Get ERC20 token buy/sell tax
I am trying to implement a method for calculating token buy/sell tax. The one that devs implement it in the transfer() function.
I've done some research and there are 2 options.
eth_call - simulate a ...
1
vote
1
answer
77
views
Recommended way to remove ETH balance from a contract?
There are multiple methods to withdraw the ETH balance of a contract to the owners' wallet:
function withdrawal() external {
payable(owner).transfer(address(this).balance);
}
function withdrawal()...
- 185
1
vote
3
answers
596
views
The block number argument in ETH JSON-RPC function calls
Multiple JSON-RPC API functions take an optional block number argument:
eth_getBalance
eth_getCode
eth_getTransactionCount
eth_getStorageAt
eth_call
My questions is this: for historical blocks, is ...
- 1,394
1
vote
2
answers
860
views
Hardhat localhost issue "Calling an account which is not a contract" with read functions only?
I need your help!
I run a hardhat testnet on localhost in a fork goerli mode and would like to test a simple Ether to WETH wrap and unwrap.
I use WETH contract address ...
0
votes
1
answer
216
views
Disadvantages of using `call` function
Hey guys, I was reading about low-level methods of calling other contract functions and I found the following description of call method:
This is the recommended method to use when you're just ...
3
votes
2
answers
2k
views
How to decode the output of an eth_call that returns a Tuple[]
I am developing a low-level library that interacts with RPC nodes directly. There is a requirement to call the AaveV2 getAllReserveTokens function, and I want to decode the output data.
The particular ...
- 121
2
votes
3
answers
893
views
What are the best online tools to easily make json rpc calls?
What are the best tools to make any of the Ethereum json rpc method requests online in addition to easily interacting with smart contracts?
- 1,408
0
votes
0
answers
71
views
Error at eth_estimateGas & eth_call geth local testnet
Here I am asking for help for my problem, namely to eth_call and eth_estimateGas. So I created LocalTestnet with the aim of making a Swap Testnet, but when I run it an error appears like the one I ...
1
vote
0
answers
18
views
Safety of writing fund transfer and NFT transfer code in an externally linked library
If suppose there is a main contract A that is linked to an external library L, would it be safe to move all the fund transfer and NFT transfer calls from the main contract into the library to reduce ...
- 13
2
votes
2
answers
2k
views
How this honeypot token is able to fool the checkers? How does it figure out how the transfer function is called - via mined or simulated transaction?
I'm developing a scanner/checker for honeypot tokens and I was using it for a few days now to scan the BSC network. While using it I keep stumbling on one particular design many times a day, which is ...
- 21
5
votes
3
answers
2k
views
Trying to understand the difference between trace_call and debug_traceCall methods
can someone help me understand the difference between trace_call and debug_traceCall? From what I've read, trace_call is to see the opcodes executed and the gas used for a transaction. debug_traceCall ...
2
votes
1
answer
475
views
The low-level functions call, delegatecall and staticcall return true as their first return value if the account called is non-existent
According to the official Solidity documentation:
The low-level functions call, delegatecall and staticcall return true as their first return value if the account called is non-existent, as part of ...
- 173
1
vote
1
answer
173
views
Able to call swap function with interface, but not with .call(
SwapByInterface works, swapByCall doesn't. Edit: have changed code to require success of internal call, previously both calls succeeding because errors not bubbling up, made the question more ...
1
vote
1
answer
170
views
convert json RPC request to byte array
I am new to json RPC and Ethereum.
I am trying to query 2 JSON RPC methods
eth_sendTransaction method
{
"jsonrpc":"2.0",
"method":"eth_sendTransaction",
...
- 11
1
vote
1
answer
286
views
What do the retOffset and retSize parameters of the CALL opcode do?
When reading the data returned by CALLing another contract, RETURNDATASIZE and RETURNDATACOPY opcodes are used. They allow moving the data from an otherwise unreachable context to the memory, so it ...
- 183
1
vote
1
answer
124
views
Out of gas ethernaut lvl 10 - reentrance
I'm trying to solve Ethernaut level 10 reentrancy task, but I'm getting "out of gas" error.
https://ethernaut.openzeppelin.com/level/0xe6BA07257a9321e755184FB2F995e0600E78c16D
This is my ...
- 109
0
votes
1
answer
898
views
Extract transaction details from uniswap eth_call event
I am attempting to programmatically infer information about transactions being submitted by uniswap.
Say I go to uniswap and try to exchange 0.1 ETH for WBTC. I then inspect the network tab of my ...
- 83
3
votes
1
answer
391
views
Call another contract with huff?
How do I call another contract with huff?
And then bonus points... Return the data from the call.
Let's say I have a solidity-style contract with a function as such:
NumberGetter.sol
uint256 myNumber =...
- 10.5k
0
votes
2
answers
301
views
calling transfer of ERC20 token using call function is not working
I tried to make token transfer contract like this,
contract TokenSender {
function transferToken(address token1Address, address to, uint256 amount) external {
(bool check, ) = ...
- 105
0
votes
1
answer
733
views
eth_call to call a function in my solidity contract fails with "execution reverted"
UPDATE: I figured it out though is doesn't entirely make sense.
When abi-encoding an "address" as an argument, you use "address" in the hash of the function signature, however you ...
0
votes
1
answer
31
views
Compiler warning when sending Ether using the 'call' keyword
The documentation recommends sending Ether from a smart contract using the call keyword:
function sendETH(address payable to, uint256 amount)
public
nonReentrant {
require(address(this).balance &...
- 765
0
votes
0
answers
68
views
Calling a function takes forever and then times out with error
I wrote this example smart contract:
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;
contract TestContract {
function foo() public pure returns (string memory) {
string memory ...
0
votes
1
answer
238
views
Race conditions in brownie, how to guarantee this will execute in order?
Let's say I have a contract like this:
contract Test{
uint8 test = 0;
// getter and setter
}
and I want to issue it using some python code like:
initial = contract.getTest()
contract.setTest(1, {&...
anon
0
votes
0
answers
151
views
Calling a non-payable function that mutates state? (web3)
With web3, you can call read-only functions using 'call()' (eg, balanceOf), and functions that mutate state with 'send({from: adr, value: 10})'
I'm able to call payable and non-payable functions fine, ...
1
vote
0
answers
130
views
eth_call for nameExpires(uint256 id)
Can someone please explain how I can build the eth_call data param for Registrar nameExpires(uint256 id)
the signature is this: 0xd6e4fa86
The function takes id of label, the namehash. BUT i dont ...
- 261
0
votes
1
answer
736
views
Transfer ether between two addressrd using call
I have this code:
function regAgent(uint[] memory _preferences) notOwner onlyBeforeEnd public {
require(msg.sender.balance - fee >= 0, "You can't pay the fee.");
require(!...
- 281
1
vote
1
answer
307
views
Custom bytecode logs data but doesn't return it on eth_call, why not?
I'm creating custom bytecode for a project
0x4160005260206000a0
// OP-Codes
// COINBASE
// PUSH1 0x00
// MSTORE
// PUSH1 0x20
// PUSH1 0x20
// LOG0
when the above is created, the transaction receipt ...
- 113
0
votes
1
answer
268
views
Call function from deployed contract
I have a deployed contract (contract A) which should act as a storage (let's say 0xD7ACd2a9FD159E69Bb102A1ca21C9a3e3A5F771B).
Now from my ERC20 Token contract (contract B), I am calling approve to the ...
- 61
3
votes
1
answer
201
views
call opcode gas consumption on a non EOA address depends if the addres is "new" or not
I have the following contract, reduced to the minimum for testing reasons:
pragma solidity ^0.6.11;
contract PackedMultiplexer {
function multiTransfer(address _address1, uint _amount1, address ...
2
votes
0
answers
2k
views
`web3.eth.abi.decodeParameters()` not returning correct values
I call to a method that returns two contract addresses, like this, where method is the method object taken from the ABI (triple-checked that already):
web3.eth.call(
{
from: account,
...
- 43
8
votes
4
answers
17k
views
How to get reason revert using web3.eth.call
I have a smart contract with required message and pretend to use the required/validation message in front end.
require(bytes(hashAlreadyRegistered[hash]).length == 0, "Hash already registered&...
2
votes
2
answers
842
views
Why field `data` in `eth_call` optional?
Based on https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_call
The data is optional, but it also says it contains hash of the method signature.
In what scenario you can send a eth_call without ...
- 123
0
votes
1
answer
687
views
linking form submission to smart contract
I have a smart contract that sends x ether to an address.
I have an html page that has a form for the address, and the amount to be sent. Theoretically it should interface with the smart contract.
...
0
votes
1
answer
261
views
got response data to nonsencical eth_call request. What is that response?
When I call a seemingly nonsensical transaction on mainnet and rinkeby.
ethereum.send('eth_call', [{'from':'0x0000000000000000000000000000000000000000', 'to':'...
- 157
2
votes
1
answer
2k
views
How can I tell if a node I am using is a full archive node?
What is the best way to tell if the node I am is using a full archive node?
One way I know if is to call a contract from the context of an old block, but this requires an RPC call and is not explicit ...
- 17.8k
1
vote
2
answers
1k
views
Infura Json RPC: how to call a function passing parameters?
IMPORTANT
My final goal is receive data via api on a php server and use Infura to call my contract to save the data
Test Situation
having this test contract on rinkeby
contract test008 {
...
- 323
0
votes
1
answer
756
views
What is the data field in eth_call commands for USDT?
I'm trying to use eth_call to send USDT (TetherToken) from one account to another (Although I know that eth_call just simiulate such transaction). Everything is clear in this regard, just the data ...
- 307
0
votes
1
answer
1k
views
What is the ethersjs equivalent of `web3.eth.call` in web3js?
web3.js has the ability to call a transaction and get return data without sending a transaction:
web3.eth.call(callObject [, defaultBlock] [, callback])
ethersjs apparently does not have this ...
0
votes
1
answer
71
views
call: Alternative transfer at the byte code level
I am reading the following stuff from the research paper at:
Restricted Transfer
We define a property that guarantees that ether transfers (via call)
cannot be invoked by any user a. Violation of ...
- 1,416
3
votes
1
answer
2k
views
web3py - Function Call when Sender Must Be Certain Address
I have a contract on Ropsten, and when I do this is python, I get a result:
result = contract.functions.getLastUpdateTime(0).call()
So I know the ABI is there, the address, etc.
There's another ...
- 701
4
votes
1
answer
66
views
Why does the `DoCall` function use the first account by default?
In this line,
// Set sender address or use a default if none specified
var addr common.Address
if args.From == nil {
if wallets := b.AccountManager().Wallets(); len(wallets) > ...
- 171
0
votes
0
answers
872
views
Get Array from a call in Web3j
I have a solidity function that returns an array.
I'm trying to read the values inside this array from web3j but it gives me stage results.
My solidity function
function getAllSubTokenByTokenID(...
- 11
0
votes
1
answer
182
views
How to understand from web3py if I need a transaction or a call
I have a contract with a function in which only if a certain condition is true, it changes the state of the blockchain otherwise it emits an event and returns:
address[] public global_state;
function ...
- 103
3
votes
2
answers
881
views
Call a view function of an Ethereum Smart Contract using a program written in C
my attempt is to call a view function to reatrieve some data from a contract on the Blockchain using a C program. I do have the interface of the contract.
I think i need to performe two things in ...
- 131