Questions tagged [abi]
The Application Binary Interface (ABI) is the standard way to interact with contracts in the Ethereum ecosystem, both from outside the blockchain and for contract-to-contract interaction. Data is encoded according to its type, as described in this specification. The encoding is not self describing and thus requires a schema in order to decode.
473
questions
0
votes
1
answer
9
views
I want to subscribe to flashloan events on the Aave v2 contract via websocket, how do I find the function/event?
I am trying to set up a websocket connection with ethers.js to listen for flashloan events.
I have made a connection successfully listening to Transfer events on the USDT contract - which was simple ...
- 1
1
vote
1
answer
60
views
how to verify a contract on etherscan?
thank you for your answers, but I think I'm still missing something, I don't know where to look for the elements that I don't like? does anyone have a solution please? I try with CONTRACT VERIFICATION ...
1
vote
0
answers
58
views
Uniswapv2 "quote" ABI
I am trying to sign contractof Uniswapv2 on ethereum mainnet using "quote" ABI. the function is
quote(uint amountA, uint reserveA, uint reserveB)
I use c++ to make the raw transaction and ...
- 49
1
vote
1
answer
28
views
transactionContract.addtoblockchain is not a function
Calling a specific function from smart contract through react jsx file , console is giving me error "transactionContract.addtoblockchain is not a function", even the function is present in ...
1
vote
1
answer
14
views
Fetching an implementation contract using ethersjs
I'm attempting to get the implementation contract for a proxy using ethers (and testing it using the recently published Paypal USD: https://etherscan.io/address/...
- 83
1
vote
1
answer
40
views
How to get Factory address from the Router address? Web3.js
I'm trying to get a factory address for Uniswap on base network, unfortunately I'm not able to locate this address anywhere and I'm kind of desperate as without it I'm not able to try my code that ...
- 131
0
votes
0
answers
47
views
TypeError: AbiCoder is not a constructor, testing purchaseSnack function is failing. I think due to not handling ether conversion correctly
I am trying to write a test script using hardhat to test the purchaseSnack function but I keep receiving these errors.
1) VendingMachine
Should fail if insufficient funds are sent:
...
- 1
1
vote
2
answers
27
views
Mint From Existing Contract
I have the following contract that is already deployed (pasted below). I can see where the constructor() method is doing an emit Transfer from the 0x0 (zero) address to the deployer address in order ...
- 15
0
votes
1
answer
64
views
Abi encode / decode mystery additional 32 byte field Uniswap v2
When I encode my abi data in web3js or web3.py for a uni v2 trade I get the following:
0x
00000000000000000000000000000000000000000000000000000000000000a0
...
- 247
0
votes
0
answers
17
views
How to unpack abi.Arguments() and access values by name
I am trying to unpack encoded arguments in input field of trunsaction.
Input field consist of 2 params: blockId and Input (another input field) - and I got stuck unpacking this 2nd input.
var ...
- 1
1
vote
3
answers
81
views
I can't verify contract on etherscan because it needs abi-encoded constructor
I can't verify and check my contract on Etherscan. It asks me for the abi-encoded constructor, but I can't find it. Can someone help me, or tell me how to find the missing information? Please!
// SPDX-...
0
votes
1
answer
71
views
How to call smart contract methods without abi?
I need to call a smart contract from python, but it is not verified. Since this is not my contract, I cannot verify it. How to call the smart contract methods through python in this case?
Smart ...
1
vote
1
answer
25
views
can't find contract after compile successfully in remix: No Contract Compiled Yet
I compile this file in 0.4.8 successfully,
pragma solidity 0.4.8;
contract A {
function f(uint[] arr) constant external returns (uint len) {
assembly {
pop arr := len
}...
- 61
0
votes
1
answer
127
views
Ethers.js solidityPackedKeccak256 to bytes32
I have a commit-reveal pattern implemented in my Solidity smart contract. I use the keccak256 encryption function to secure the player's commitment.
How can I convert the return value of ...
- 202
0
votes
1
answer
41
views
What is an alternative for ethers.AbiCoder in geth
I have a following code that encodes parameters with AbiCoder
const name = "Crown";
const symbol = "Crown";
const decimals = 18;
const coder = new AbiCoder();
const nameBytes = ...
0
votes
0
answers
30
views
What's the best way to get multi-chain (EVM only) transaction details given a wallet address?
Context
I want to display user transactions as shown in Polygon scan (with all the details, logs, decoded input field, etc.)
Currently I use Ankr's getTransactionsByAddress to get the transactions for ...
0
votes
0
answers
17
views
web3.eth.abi.decodeLog not finding an event argument
I have a complicated event with the following signature:
event SwappedShares(uint256 _stable, DataTypes.FeeReturn _fees, address _user, DataTypes.SubPoolGroup[] _subPoolGroups);
Here are the ...
- 489
0
votes
0
answers
58
views
abi: cannot use invalid as type array as argument
I am using go-ethereum to deploy a smart contract.
This is how I create the contractABI
contractABI, err := abi.JSON(strings.NewReader(getAbi()))
if err != nil {
log.Fatal(err)
}
...
- 213
0
votes
1
answer
127
views
Transforming Ethereum ABI(JSON) into Human-Readable ABI in Python
I know there is one example to do it: ethersjs implementation
But how to transforming Ethereum ABI into Human-Readable ABI in Python?
- 61
0
votes
0
answers
76
views
How to decode data into a struct and store it?
I am trying to make a function that takes in abi-encoded data and decodes it into a struct and stores the struct's values in my smart contract. To generate the encoded data, I am using ethers.js
...
- 53
0
votes
1
answer
97
views
Abi calldata encoding nested structs, find a way
I didn't found any instructions about nested structs (in structs).
Seen video about sending bytecode to contract and I wanted to understand.
For example, method is:
function fulfillOrder(
Order ...
1
vote
0
answers
35
views
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
1
answer
85
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
0
votes
1
answer
22
views
using encodePacked vs encodeWithSignature when call function on an external contract
When we call a function on an external contract, we need to put calldata as an argument.
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.8.10;
contract test1 {
mapping (address => ...
- 425
0
votes
1
answer
21
views
Is there a downside to using a deprecated version of the ERC20 ABI?
I am aware there is deprecated keyword "constant" present in old versions of Solidity ABI for ERC20. Is this still just as good as the latest versions, or should I update asap? On the other ...
- 125
0
votes
1
answer
139
views
Does the specific ABI of a particular ERC20 token have to be used in order to interract with it?
....Or can the standard, static ERC20 ABI be used for any ERC20 token equally?
Namely, in a custom ERC20 token (smart contract) there can exist any function(s) the author of a token may have ...
- 91
0
votes
0
answers
14
views
How to register 'abi-encoded' in bscScan? (noob)
I made a token with '.sol' through 'Remix'.
After that, I copied my token abi, pasted it to 'https://abi.hashex.org/' , and checked the construction function, and it was empty.
What is the '...
- 1
1
vote
1
answer
87
views
Compiling two smart contracts it the same folder cause duplicates
When I compile two contracts in the same folder I get duplicates. The following contracts, Store.sol
pragma solidity ^0.8.0;
contract Store {
event ItemSet(bytes32 key, bytes32 value);
...
- 213
0
votes
0
answers
15
views
Cannot create contract "invalid identifier" second time loading
I create a contract interface with ether.js, below the error is the onMount function. The "first time" the component is mounted, the contract is created without problem. The second time, and ...
- 101
2
votes
2
answers
168
views
How does MetaMask know the name of the contract function you're calling?
When you interact with a smart contract and, instead of the name of the function you're calling, MetaMask only outputs "CONTRACT INTERACTION", is this because the contract you're interacting ...
- 279
2
votes
2
answers
192
views
Why can't MetaMask "verify" a contract?
When interacting with smart contracts via MetaMask, what does it mean when the wallet tells you "We cannot verify this contract. Make sure you trust this address"?
See an example of the ...
- 279
1
vote
0
answers
55
views
ABI interaction of Safe custom module
We've recently deployed a contract to testnet for managing membership nfts of a gnosis safe, however, is there any way that we can go about interacting with this custom module in a way that doesn't ...
- 11
1
vote
1
answer
221
views
How can i get Abi from the byteCode using ethersjs i am using following code:-
Its not working for me
const byteCode = await provider.getCode(address);
const AABBI = ethers.utils.Interface.parse(byteCode).abi;
console.log("AAABBBIII", AABBI);
1
vote
1
answer
180
views
How to decode ABI such that i get From, To, For in python
Currently my implementations of abi decode gets only token amount and not the From, To, address and token amount is without decimal point
value = decode(['uint256'],log['data'])
ouptput
Token ...
- 11
2
votes
1
answer
158
views
How to calculate the 4byte selector using Cast?
I am using Foundry, and I need to calculate the 4-byte selector of a custom error. How can I do this with the cast CLI?
- 16.8k
1
vote
0
answers
104
views
Help understanding why I am getting an error when calling the observe() function on IUniswapV3Pool?
The function I'm trying to call is observe() at line 326
I have previously successfully called this before but I'm coming back to it after a while and it is giving an error I don't understand. This is ...
1
vote
0
answers
150
views
ABI-encoding in Nethereum of a struct that contains a bytes-array (variable size)
I have a custom struct defined in solidity. When calling the decode-function of the contract, I want to decode an encoded MyStruct (in bytes).
This works perfectly as long as a previous defined ...
0
votes
1
answer
46
views
Question about the Contract API from ethers.js
API spec for Contract:
new Contract(addressOrName: string, contractInterface: ethers.ethers.ContractInterface, signerOrProvider?: ethers.ethers.providers.Provider | ethers.ethers.Signer | undefined):
...
0
votes
1
answer
505
views
How to decode the msg.data on a function in plain solidity?
I was wondering how to decode the data payload received on a function
At first, I thought it would be enough with knowing the order of the variables and the exact data type of them at the moment of ...
1
vote
1
answer
956
views
How to generate a contract's artifact in solidity/foundry to use with targetArtifact?
Foundry invariant tests (stateful fuzzing) have helper functions for configurable invariant test setup such as targetArtifact(string memory newTargetedArtifact_), which adds a Target Artifact defined ...
- 10.2k
2
votes
2
answers
341
views
How to extract the ABI part from JSON file created in artifacts and create a separate file for it?
I have been using the Hardhat environment for a while now, and every time I have to provide the ABI to the front-end team, I need to copy-paste the ABI manually from the JSON file, since it contains ...
- 1,088
2
votes
1
answer
375
views
Get ABI code for an ethereum contract event
How can I construct the ABI code for a contract event?
I don't need the whole contract ABI.
Example:
transferFrom(address,address,uint256)
executeMetaTransaction(address,bytes,bytes32,bytes32,uint8)
...
- 43
0
votes
1
answer
476
views
How to decode abi.encodeWithSignature and get the encoded values?
I'm running Foundry and trying to decode the encoded signature, but I'm getting "EvmError: Revert" error when running the below code. It appears to be something I'm doing incorrectly with ...
- 23
0
votes
1
answer
30
views
Chainlink UpKeep Registration ABI Error Problem
Everytime I try to register my UpKeep on Chainlink Automation, I get this error, "ABI must be of type { "name": string, "inputs": { "name": string, "type": ...
0
votes
1
answer
137
views
How do get human-readable function definition from ABI in Python?
By human-readable I mean how the definition looks like in solidity. Example. Wasn't able to find it in Google.
- 171
0
votes
1
answer
157
views
Is there a way to index all contracts which deployed in an EVM-based chain?
I don't want to use a third party explorer or database, please don't give examples such as etherscan, 4byte directory etc.
This is basically what i want to do:
basically I need the ABIs of the ...
1
vote
1
answer
837
views
How to decode `encodePacked` data
I have two addresses, _token1 and _token2. I would like to pack them into bytes data to pass it to a function.
bytes memory params = abi.encode(_token1, _token2);
The obtained params is the ...
- 177
0
votes
1
answer
119
views
TypeError: Member "encodeCall" not found or not visible after argument-dependent lookup in abi
I am trying to test abi.encodeCall on Remix. I have this function
function getTestData() external pure returns (bytes memory){
// passing empty args ()
return abi.encodeCall(TargetContract.send,());
}
...
- 1,492
1
vote
0
answers
240
views
How can we send contract transaction with Web3dart package?
I'm using web3dart package to send tokens on the Ethereum blockchain. but every time returns error :
[log] RPCError: got code -32000 with msg "filter not found".
[log] #0 JsonRPC.call
...
- 11
0
votes
1
answer
222
views
How to verify ABI matches the source code?
I want to analyze the Solidity version of the source code of the smart contract of a crypto coin.
I can get the ABI from Etherscan and I can get the smart contract from, say, Github. (Assume the ...
- 201