Questions tagged [web3js]
Javascript API and library for Ethereum To develop applications on Ethereum, you can use the web3 object provided by the web3.js library. Under the hood it communicates to a local node through RPC calls. web3.js works with any Ethereum node, which exposes an RPC layer. https://github.com/ethereum/wiki/wiki/JavaScript-API
6,085
questions
0
votes
0
answers
108
views
Using Web3 the value sent as payable (msg.value) is equal to 0
We have a smart contract that is supposed to receive payments in order to mint token; it follows the ERC1155 standards as it extends ERC1155URIStorage.
Here is a sample of the contract we deploy:
// ...
- 101
0
votes
0
answers
18
views
How to decode orca.so api response
I'm building my arbitrage bot with orca.so, when I try to fetch the price via their api this is the response:
{
"jsonrpc": "2.0",
"result": {
"...
0
votes
0
answers
32
views
JsonRpcProvider RPC call results wrong while BrowserProvider works well
I'm facing really weird phemomenon..
What Im doing is, Im instantiating Wallet with my private key,
and trying to send ERC-20 methods to endpoint ('https://ethereum.publicnode.com')
const provider = ...
- 33
0
votes
2
answers
73
views
How to know total value of buying and selling of a wallet via web3
I want to know how much a wallet has bought and sold the assets. I need to know it in dollars. For example, 500$ of assets bought and sold by a wallet
Something like this is possible in web3?
- 289
0
votes
1
answer
29
views
How to get total assets value in dollars of a wallet via web3?
I want to check the total assets value in dollars of a wallet.
For example, I just want to check how much asset (Ethers, erc20 tokens) does a wallet hold in form of dollars? e.g: 2000$ worth of assets ...
- 289
1
vote
1
answer
147
views
How do I access external view data through a proxy's implementation contract with web3.py if the data is stored in the proxy itself?
I want to use web3.py to access all sorts of view-data from smart contracts. In some cases, it's pretty simple. Take USDt:
You have the USDt contract on mainnet, ...
- 13
0
votes
0
answers
47
views
NFTs displayed in a collection
I want to display all the NFTs with the same collection name on my marketplace however I get nothing displayed, I have a home page where it displays each collection as a card and I have a collection ...
0
votes
0
answers
49
views
How to dynamic import web3 in next js
I'm using web3 in my project, due to its size I want to import in dynamically,
const Web3 = dynamic(() => import('web3'));
But I'm getting these errors under this () => import(web3));
Type '...
- 11
0
votes
0
answers
6
views
failed connecting with virtual machine
I have 4 geth Nodes runnning on my PC
bootnode address is 192.168.1.2
the 5th node is running on Virtual machine with address ( 192.168.1.5 )
when i try to run the 5th node it doesn't sync with the ...
- 1
2
votes
1
answer
57
views
+50
abi-decoder's decodeMethod returns undefined
I am trying to decode the input field of this transaction as below,
const decodedInput = abiDecoder.decodeMethod(transaction.input);
but decodedInput returns undefined despite the my ABI having the ...
0
votes
0
answers
25
views
What do the to/from fields in a swap event mean?
Im parsing swap log events from web3 and was reading the to and from addresses from the topic but sometimes the from/to address is the same, and other times its different. It doesn't seem to ever be ...
- 135
1
vote
1
answer
73
views
web3.js how to call receive() external payable?
firstly, I have a code in a contract as below:
receive() external payable {
// function enter() external payable {
require(msg.value > 0.1 ether, "require minimum 0.1 ether!...
- 11
0
votes
1
answer
716
views
adding BigNumbers with ethers
I am running tests and use ethers to format big numbers. I can't figure out how to add them.
For example, say I have two numbers I convert into 10 and 100 Finney:
const x1 = utils.formatUnits(&...
- 701
0
votes
0
answers
131
views
Error code from `web3.eth.getTransactionReceipt`
I have code structure like this.
try {
await web3.eth.getTransactionReceipt(hash);
} catch (e) {
console.log(e.message);
console.log(e.code);
console.log(e);
}
When the hash is 123, ...
0
votes
0
answers
16
views
Compiling Vyper files results in a 'path exists outside base folder' error
I was working with the truffle VyperStorage Example Box. When I execute truffle compile it shows me the error above. I have installed Vyper using pip.The truffle config.js file is used as default so ...
0
votes
0
answers
56
views
how can I get a Block hash before sending?
I'm using tron-api for trx transactions. The obtained raw_data is as follows:
[
"visible" => false
"txID" => "...
- 1
0
votes
0
answers
11
views
Get all transactions on ethereum
Is there a way to get all transactions on ethereum such that transactions between two unique wallets will be counted as one ?
- 9
0
votes
0
answers
31
views
Error: Transaction has been reverted by the EVM
I am trying to call the following solidity method from my smart contract in javascript:
address[] public investors;
function addInvestor(address investor) public {
investors.push(investor);
...
- 1
0
votes
0
answers
14
views
Get exact Swap price using LP info
I want to calculate the exact price for each swap event that comes through on the blockchain. I gather that the only way to do that is to track the LP balances for WETH and the token. If there is ...
- 135
0
votes
0
answers
86
views
Decoding the array from the solidity events using web3.js
I want to track an event emitted by the smart contract from the backend using web3.js, But the Problem is there is the array type(uint8[]) in the event ,whenever I try to decode it it gives the ...
- 81
0
votes
0
answers
50
views
How to get position slot allowance automatic
how to get position slot allowance automatically without looking at the code? because each positive slot allowance in several different tokens, some of the default position is 2 but there are 3 and ...
0
votes
0
answers
112
views
error the second time I try to Mint: "execution reverted: ERC20: transfer amount exceeds allowance"
I've a problem trying to mint a token in a custom smart-contract.
I'm using Nextjs and Wagmi to read/write to the contract
const { data, writeAsync: approve } = useErc20Write("approve", [
...
- 1
0
votes
0
answers
11
views
Why is it not showing any results in the Table / Collection Section?
this is my transport.request.model
import mongoose from "mongoose";
const schema = new mongoose.Schema({
Transport : String,
Product : String,
Material : String,
Capacity : Number,
...
- 3
1
vote
1
answer
380
views
How would I be able to set slippage for exactInputSingle on Uniswap v3 and Pancakeswap v3?
I'm able to do swap transactions using multicall and exactInputSingle functions on both Uniswap v3 and Pancakeswap v3. However, I have no idea how would I be able to set the slippage. The v2 routers ...
- 123
1
vote
1
answer
123
views
How to read all Transfers on blockchain
How do I get all transfers occurring on the blockchain and their transaction amounts and to and from addresses?
event_signature_hash = web3.keccak(text='Transfer(address,address,uint256)').hex()
...
- 135
0
votes
1
answer
321
views
web3 python - AttributeError: 'Eth' object has no attribute 'abi'
I am trying to use an example ABI but its not being found.
My problem is on last line:
AttributeError: 'Eth' object has no attribute 'abi'
infura_url = 'https://mainnet.infura.io/v3/xxx'
web3 = Web3(...
- 135
0
votes
1
answer
107
views
Error: network does not support ENS (operation=“ENS”, network=“maticmum”, code=UNSUPPORTED_OPERATION, version=providers/5.5.3 Network doesnot support
Hello I wrote a smart contract for crowd funding Actually I have two contracts One is create a campaign for donate funds and second is created campigns for crowd-funding and store all the campaigns ...
- 11
1
vote
0
answers
87
views
How to transfer coins between L1 and L2 via web3.js or ethers.js?
How to do it? Programmatically.
Does it always require a bridge? Or can it be done in other way too?
I haven't found any difinitive answer to this anywhere.
- 49
0
votes
0
answers
13
views
A moment when an incoming TX has been complitely settled and the coins may be sent out?
I have 2 wallets.
I want to send coins from one to the other (1), and from the 2nd one to an external wallet (2).
const wallet = get_wallet();
const balance = await provider.getBalance(wallet.address);...
- 91
0
votes
1
answer
28
views
Buy token just after the pair deployment?
Hello i saw this today :
I'm wondering if how it's possible for someone to buy a token in same time as pair deployment.
If i check into some mempool we do not have the info that a pending order is a ...
- 237
1
vote
1
answer
215
views
How to know token transfered in pending status from memepool
i'm getting list of data from web3.eth.filter('pending'), here i'm listening uniswap ETH router.
If i print one result of the list :
AttributeDict({'blockHash': None, 'blockNumber': None, 'from':
'...
- 237
0
votes
0
answers
544
views
Unhandled Runtime Error TypeError: Cannot read properties of undefined (reading 'args')
I get this error Unhandled Runtime Error
TypeError: Cannot read properties of undefined (reading 'args') whenever I want to create an nft on my decentralised application and it only appears after I ...
0
votes
0
answers
261
views
polygon mumbai testnet doesn't revert error reason, instead confirm transaction with status:false
i use web3js to request to the polygon mumbai testnet using quicknode. when i use ganache, i get error revert reson easily but when i use mumbai testnet, it consume gas and return receipt with status ...
0
votes
1
answer
25
views
How do I deposit and restore my Ethereum to my wallet?
I want Ethereum to enter my Metamask wallet and I can use it easily to this address. 0x005449873eFD4b886DFDb3dfFeB1fA93817F8449
0
votes
1
answer
2k
views
How can I remove custom spending cap on Metamask?
When I call the approve function of the ERC20 token standard, it asks me to set a custom spending cap, as shown below.
But I need to use the default value every time without clicking "use ...
- 1
1
vote
1
answer
132
views
Can't catch all the events using ethers
Can't catch all the events. Why?
I try to listen to events for several contracts and it is ok. But the more contracts I listen to, the more events are missed? Is there any way to prevent this and why ...
- 11
1
vote
1
answer
104
views
How does one create and send TXs on L2 - Arbitrum and others?
In ethers.js or web3.js
How does one create and send TXs on L2 - Arbitrum and others? Is the algorithm absolutely identical to the one on L1, or not?
How does one transfer ETH between L1 and L2?
- 91
0
votes
1
answer
278
views
types/value length mismatch (argument="tuple", value='myAddress'
I'm having some problem with the arguments of a function written in solidity and called in JavaScript. I'm using the Remix ballot default example, except I removed the first require in it. It looks ...
- 1
0
votes
0
answers
23
views
Private blockchain nodes not running in background
Sir I am creating a private blockchain using geth.
Doing it on aws ubuntu
My geth.service file contains
Unit]
Description=Ethereum go client
[Service]
User=root
Type=simple
Restart=always
After=...
1
vote
1
answer
395
views
ethers js listening to events doesn't work
What I'm trying to do:
I'm trying to listen to any event happening on a contract. Since I'm doing this for the first time, I chose a popular liquidity pool, the "Cake" liquidity pool on ...
- 63
0
votes
0
answers
28
views
Unable to deposit tokens into the contract when the user's balance within the contract is 0
I'm working on a web-based interaction with a smart contract that allows users to deposit and withdraw tokens. I've noticed that when the user's balance within the contract is 0, they cannot deposit ...
0
votes
1
answer
165
views
Is it possibleimpersonate an account using only ethers.js without using Hardhat
Is it possible to impersonate an account using ether js only? I don't want to use Hardhat. Though I have forked mainnet using foundry. Now wants to transfer eth of let's say vitalik to my own account ...
- 11
0
votes
0
answers
52
views
Error: network does not support ENS (operation=“ENS”, network=“maticmum”, code=UNSUPPORTED_OPERATION, version=providers/5.5.3 this error is comingabc
When I try to access address as endpoints on getstaticpaths the error is coming
Error: network does not support ENS (operation=“ENS”, network=“maticmum”, code=UNSUPPORTED_OPERATION, version=providers/...
- 1
0
votes
0
answers
341
views
window.ethereum.request({method: "eth_requestAccounts"}) automatically picks the connected account when making a transaction
I have multiple accounts on my Metamask wallet(Most of them are connected to the site). But my selected account is not connected to the Dapp. So, when I try to send a transaction it uses one of the ...
0
votes
0
answers
55
views
Error: EACCES: permission denied, mkdir '/root/.config/hardhat-nodejs'
While compiling below errors occurs anyone please look into this
Learn more at https://hardhat.org/hardhat-runner/docs/reference/solidity-support
An unexpected error occurred:
Error: EACCES: ...
0
votes
1
answer
93
views
Error while compiling contracts: Cannot find module '@nomiclabs/hardhat-truffle5'
Below error occurs while compiling smart contracts through hardhat.
npx hardhat compile --show-stack-traces
An unexpected error occurred:
Error: Cannot find module '@nomiclabs/hardhat-truffle5'
...
0
votes
1
answer
570
views
Error: Returned error: nonce too low
const Web3 = require('web3');
const { ethers } = require('ethers');
const { Web3Provider } = require('@ethersproject/providers');
// Virtual addresses
const fromAddress = '...
0
votes
0
answers
31
views
Is there any way to get the array length inside a mapping without a getter function or count variable?
mapping(address => uint256[]) public submitterAddressToFormIdsAssigned;
This is a mapping from an address to an array of uint256s.
I want to get the length of array. I used a count variable before ...
- 358
1
vote
0
answers
66
views
How to let client side sign the transaction and send it to blockchain
This mint function is giving me this error
Uncaught (in promise) Error: Returned error: transaction could not be decoded: unsupported transaction type
And if I use ethereum-js/tx module to serialize ...
- 11
0
votes
0
answers
61
views
Error: Keys not exchanged when calling await ethereum.request({method: 'eth_requestAccounts'})
I am trying to connect my React Native app to MetaMask with
MetamaskSDK, but I am getting the error "Error: Keys not exchanged"
when calling await ethereum.request({method: '...
