Questions tagged [etherscan]

Etherscan is a search engine that allows Ethereum blockchain users to look up, confirm and validate transactions that have taken place on the blockchain.

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Read transaction logs of another Smart Contract

I have to track user activity in DEX smart contract and do some validation/operation based on that information. DEX itself does not API to retrieve that info, but emit events, so is there any way to ...
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Fail with error 'TransferHelper: TRANSFER_FROM_FAILED' By calling UniswapV2Router02 swapExactTokensForETH

I am trying to call UniswapV2Router02 swapExactTokensForETH function on my Solidity Contract. I got Fail with error 'TransferHelper: TRANSFER_FROM_FAILED' on etherscan. this is transaction url : ...
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Is there any alternative to string[]?

I need to store a number 4D security hashes. For example: CCHdU3mFEYPpa-CYeDSooeZtYSG-CD9czobepa4a9-CRmVpX3Tegakr I am storing number of these hashes in array of string i.e. string[] using pragma ...
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“invalid Txn hash has been entered”, “undefined” error from etherscan [closed]

Attempted an eth swap transaction on uniswap Ledger X thru Metamask about 3hrs ago - it's still pending in Metamask. Etherscan give the following error: "Oops! An invalid Txn hash has been ...
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If I participate in a ERC20 ICO with my Metamask eth address, can I add the custom token later on?

If I have not added the ICO's token to my Metamask yet as a custom token, can I do it after the token distribution? Like claiming my tokens after it's been sent, by adding the new custom token to my ...
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Can't sweep from Paper wallet. Unsupported Format

I have an Ethereum paper wallet from 2 years ago. I am trying to sweep the paper wallet using Coinomi. The app states that the format of the private key is unsupported. The public key works properly ...
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30 views

How to transfer eth to specific address in smart contract?

I want to send eth to specific amount by calling smart contract. This is my contract. pragma solidity ^0.6.7; contract MyContract {      address payable receiver; constructor(address ...
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Error! Unable to locate Contract Code at 0x6… Is this a valid Contract Address?

I have the problem now that etherscam does not let me verify my contract and I get the following errors, I have left a GitHub link with my codes to see who could really help me, thank you very much! ...
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23 views

Events declared in library are missed in contract ABI

DYDX contract SoloMargin is firing events like LogTrade, LogSell but they are not provided in ABI. SoloMargin contract: https://etherscan.io/address/0x1e0447b19bb6ecfdae1e4ae1694b0c3659614e4e#code ...
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Possible to get a contract/token's age using etherscan api?

I want to programmatically get the age of a contract or token on the ethereum blockchain. Is there a reliable way to do this with the etherscan api?
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Why my function named SubmitHash shows in Etherscan input field but not PublishHash?

I deployed my contract in Ropsten Testnet with submitHash as a function name. I get function Name with value passed in Etherscan. function submitHash(bytes32 pHash) external onlyOwner() { emit ...
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Error: failed to unlock developer account on using list

I am following this video from youtube to learn about blockchain. I am getting error while trying to list the account using command "geth -datadir /media/privatechain -dev account list". But ...
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Find freshly deployed contracts on ethereum network

Hi folks is there a simple way using which I can find the latest contracts being deployed(for an erc20 token) on the ethereum network, I mean may be etherscan.io or something where I could see that ...
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Problem Uploading Contract Verification to Etherscan - Contract works perfectly and is already deployed

BOUNTY WILL BE GIVEN FOR SOLUTION I am having trouble authenticating my ERC-20 Token Contract on Etherscan. Token works perfectly and all functions are correct I am a novice dev and lead dev of ...
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Sweeping ETH from a 2 year old paper wallet, help?

I have a paper wallet from an ETH atm from 2 years ago. I am trying to sweep the funds onto a digital wallet. I have used multiple ETH wallet apps on my phone but none of them were able to recognize ...
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Check all failed transactions in last 100 blocks

How do I get all the failed transactions in last 100 blocks using etherscan or some other service? Also the reason for failure and gas involved in the transaction Checked few similar questions that ...
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I accidentally sent a BPT token to a token contract. Can I get it back?

Instead of transferring my BPT token to my wallet, I accidentally sent it to the contract itself. I sent 99,546.988023218400325838 BPT to the address 0x471eb7dcf6647abaf838a5aad94940ce6932198c The ...
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Etherscan Yellow Exclamation Sign - Compiler Specific Version Warning

I just noticed that my contract 0xa150Db9b1Fa65b44799d4dD949D922c0a33Ee606 has the warning on Etherscan (yellow exclamation). This is in the Contract section and the contract has been successfully ...
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Why I cannot get any updated smart contracts from etherscan after craweling while etherscan has supportted to upload proxy contract mark already?

Etherscan supports proxy contracts associated with its implementation contracts https://medium.com/etherscan-blog/and-finally-proxy-contract-support-on-etherscan-693e3da0714b since 2018. However, ...
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i am new to this, can someone steal my erc20 token with the Function approve()

I have been using yield Farming (YFValue) and I noticed when I accept the contract via MetaMask. I set faming 500 USDT but in the contract the input was: Function: approve(address _spender, uint256 ...
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ERC20 Code - How to Read and Publish on Github

I created and deployed the smart contract using ConsenSys EIP20 sample (https://github.com/ConsenSys/Tokens/tree/master/contracts/eip20). Basically, I took the file EIP20.sol and changed the name of ...
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My activity is erased from the Ropsten testnet

I am new to blockchain development, and I just deployed a Token creation contract yesterday to the Ropsten test network. After creation, the token showed up properly with the correct supply on the ...
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How to judge whether a reentrancy attack is successful when reproducing the attack in private chain with Remix?

I reproduce the attack using the same codes successfully in Javascript VM of Remix, there are events in logs. But when I reproduce it in private chain, there are nothing. I cannot judge whether the ...
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How do I get my eth from Etherscan to stop being pending and send to my lion's share account?

I am already a member in Lion's Share and I have purchased up to level 3 so far. I am trying to figure out why I dont see my ETH in my Lion's Share and pending transactions in Etherscan? When I click ...
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How can I see all transferFrom events for ERC20 token using etherscan api?

Is there a way to see all transferFrom() calls/transactions that happen for an ERC20 token using the etherscan api?
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What to do if Metamask doesn't show a deposit because it's an “internal transaction”?

This is a follow-up on the question "Do all transactions show in Metamask wallet?" from Sky Hayward, in which Sky asked about transactions that show up as successful on etherscan, yet the ...
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114 views

Do all transactions show in metamask wallet?

Bare with me I'm new here :) I've been selling art on Rarible but I can't tell if the Eth is going into my account. Because I'm minting nft's I can't keep track of my Eth total. My wallet activity ...
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32 views

How to get require() error message?

I can see the error message on Etherscan. But I can't find it in getTransactionRecept(). Is there any special settings that I need set in my Genesis.json before I can see it?
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Chainlink wrong address [duplicate]

So I recently withdrew funds from binance to my wallet, unfortunately I input a digit wrong in the address and it’s gone elsewhere. Is it possible to recover these funds or the funds are completely ...
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31 views

uint256[] array formatting

I'm currently trying to enable zk-proof verification on Ethereum. The zk-proof I'm using is an array of uint256[8]. I manage to verify it locally, but if I want to submit it to the Rinkeby testnet ...
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Forgot to add gas before sending Crypterium. What can I do?

I tried to send about $120 worth of Crypterium from Etherscan to my wallet and forgot I didn’t have ETH to use for gas. The transaction has been stuck on “pending” for weeks now. Is there something I ...
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How to understand supplies from smart contracts

I would like to understand how is total supply calculated and how could I know how much is circulating for particular token. I will just use random token for example https://etherscan.io/address/...
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Can a contract address have both ERC20 and ERC721 transactions

Some addresses on Etherscan like this one show both type of transactions (ERC20 and ERC721) on Etherscan. So, does that mean that both standards can be implemented at the same time for a token?
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Etherscan showing 0 holders

I created an ERC20 token and deployed it using Remix IDE. My smart contract is available here: https://etherscan.io/address/0xdacD69347dE42baBfAEcD09dC88958378780FB62#code I assigned all available ...
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Why some contract addresses show 0 supply and 0 holders on Etherscan

I have a an old list from December 2019 which showed the holders, supply and transfers in last 24h from Etherscan like here . Howvever while I was revisiting the addresses on Etherscan, there were a ...
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ROPSTEN - successfuly broadcast but there is not in etherscan site

I create a transaction hash raw and using by MyEtherWallet's send offline tools, broadcasting it. But when I go through the provided link in etherscan site, it shows me: Sorry, We are unable to locate ...
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Getting name/decemals of unstandardized token on Ethereum blockchain with web3.js

I understand how to call methods of name/symbol or decemals on ERC-20 tokens but what about tokens that do not have such.. for example this token here https://etherscan.io/token/...
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Can unverified contracts expose a public ABI?

I am trying to understand if there are unverified contracts that come with a public ABI. I was exploring contracts on Etherscan, and I was only able to find unverified contracts without source code ...
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Etherscan yul optimizer verification

Is it possible to verify contracts on etherscan.io using the yul optimizer? Example truffle-config.js relevant section: compilers: { solc: { version: "0.5.16", settings: { ...
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39 views

How do I get a list of tokens held by an Etehereum address?

TL;DR: wanted: a method that receives an address as a parameter and returns an array of token names/contracts/balances held by address. I'm aware of the fact that Etherscan API has a method allowing ...
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1answer
33 views

I have a Transaction Hash, how to get the readable Input Data?

i have a Transaction Hash: 0x9f46760404dd3075533e8360fe4beb0ba7210423af1f4a95a5c80defffe824b5, for how do i decode the "input data" easily? for example: https://www.blockchain.com/eth/tx/...
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Error while calling a function,

I created a Factory Contract which can create new ERC20 tokens with the parameters passed to it. Address of the contract: (Goerli Testnet) 0x482829Ba989fBC368F9A89dFf56cdF4036F39F28 I tested the ...
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configureMinter at USDC Token on Rinkeby

I have deployed the ERC20 token USDC to Rinkeby. More precisely I have deployed the proxy contract and the token contract. Then I called the upgradeToAndCall function to implement and initialize the ...
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152 views

How to get all kind of transactions happend to/from an address within a time range?

I'm trying to get all transactions that occured to an address within a specified time range. The transactions shall include all ethers as well as token transactions done to/from an ethereum address. I ...
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48 views

Latest block number and its transactions from etherchain.org

I am trying to get the latest block information such as latest block number and all its transactions details such as Tx hash, gas price, gas used, timestamp etc., from etherchain.org. I know Etherscan ...
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141 views

How to get list of transaction for ERC20 token address?

Can anyone please help me to get list of transaction for ERC20 token similar to https://api-ropsten.etherscan.io/api?module=account&action=txlist&address=...
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Why are these high fee transactions not being mined?

Looking at the state of pending transactions on Etherscan I noticed two transactions that have a gas price much higher than that of the average network fee, yet they are not being mined. The ...
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63 views

Why is the compiler unable to generate Contract ByteCode and ABI when I try to Verify & Publish my contract?

Another dev no longer connected to our project deployed this contract, and I'm trying to Verify & Publish it on Etherscan now. What am I doing wrong? I do know that the dev who built this used ...
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116 views

How to pass 0 length array as parameter on EtherScan contract editor

suppose one of the function input parameter is bool[] testInput sometimes I want to pass 0 length array like this => [] instead of this => [true,false,true], how does it possible with etherscan.io. ...
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How can I replicate the Token Tracker etherscan page using python and etherscan API?

So I want to list top tokens and their associated stats, like on https://etherscan.io/tokens. Even simpler than that, how can I use the etherscan python API (or https://github.com/corpetty/py-...

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