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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Etherscan Transaction Action Info

I'm trying to establish if it's possible to use the etherscan API to establish the Transaction Action information (e.g. Swap 1 Ether For 2 Yf-DAI). If not, how are they doing it? I had a look to see ...
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Discrepancy between Etherscan.io and Google Big Query information

I noticed that there are large discrepancies between the balances of addresses in Etherscan vs Google Big Query. Also some addresses that are listed in Etherscan are not existing in the balances table ...
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How can I access data of transaction topic?

I need to access the data from topic 2 below (see image): With this code I can render the topic hash, but not the topic data: contract .getPastEvents('allEvents', { fromBlock: START_BLOCK, ...
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Publish and verify the source contract code in Ethscan. I tried it but it keeps failing. Can anyone help me? thank you [closed]

pragma solidity ^0.6.0; import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/master/contracts/token/ERC20/ERC20.sol"; contract cltToken is ERC20 { constructor(address to,...
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Why addresses from the exchanges do not show on Etherscan?

I have some ether in an exchange but when I searched it on etherscan.io it is showing There are no matching entries there I got to know exchanges have the balances on their own wallet address, but ...
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How do I get gas used by or price of a single mined transaction like in etherscan through a ethereum node?

I was using ethers.js to get the transaction receipt of a mined transaction but when I get the cumulative gas used it seems to give me cumulative gas of the block mined and not the transaction itself. ...
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Events not working in Trust wallet or Metamask

Recently, I've developed an Dapp using pure vanilla js and it's contract is currently deployed on etherscan.When someone buys a token, it should increment..Everything's working fine but in the trust ...
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Neither Token name nor supply shown in etherscan, instead shown “() N/A”

Recently, I've created an ERC20 token on Etherscan and verify the source code but my token information such as token name and total supply not showing up..Instead it shows balance: 0 N/a and supply ...
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How do I create a Token Tracker for my ERC20 token on Etherscan? [closed]

On the Ropenstine Test Network, It took only a few seconds for my ERC20 token to have a tracker page. Not a contract page, but the ones that say "Token: (Token Name)". Here's the contract: ...
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eth_call returns weird result for uint256 [closed]

I'm trying to call a function from contract 0x844ED597b4E7A531C154512B4216689e69133eE5 called targetRate. I converted it to Keccak-256 and took the first 8 characters and added 0x before it. So the ...
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Any ideas how to recover my 400 UNI drop from an old instadapp mcd vault smart contract?

I apologize for having to post this again because my lack of reputation but maybe I can reword it better this time. My ETH address: 0x34A2860bbbA761ae27005799b02D3DbD8b4b5fEb Old InstadApp MCD Vault ...
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Can I change the comments in a contract and still pass Etherscan verification?

Suppose that you have a contract, someone audited it, and you would like to use that specific version for compilation and deployment to Ethereum. Now, you want to verify the source code on Etherscan, ...
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Why INSUFFICIENT_OUTPUT_AMOUNT?

I sent this transaction with 74 GWEI and 185421 gas limit. So far my calculations: 74 * 185421 -> about 6.6 USD, at the time of writing. The screenshot above shows 1.04 USD. Below it says gas used ~...
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Getting 0 holder on Etherscan testnet despite having token transactions through DAPP

Recently, I've created a token and it is pure ERC-20 Compliant...I've sent some token to another address but when I see it on rinkeby testnet etherscan web page it shows 0 holder despite having the ...
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Order of pairs in sync events

I was checking at SYNC transactions of some Uniswap contracts: and noticed that in some contracts the ETH amount comes first and in others second (here it's second, i.e. reserve1). Other than ...
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Transaction failed etherscan, coins disappeared?

Okay, I have no idea what just happened, but I think I just lost like 50% of my coins. I sent Link from my ledger to binance, and when I checked an hour later, it said failed both on my ledger app and ...
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Convert JavaScript number to uint256

I'm trying to deploy ERC20 contract by using Web3. Here's the contract constructor fun: constructor( string memory name, string memory symbol, uint8 decimals, uint256 ...
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A good way to decode transaction hash content on public Ethereum blockchain?

I want to check if there are some good tools available to decode the transaction hash to know the content on public Ethereum Blockchain? Primarily to validate the data stored by the dapp. Thanks
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Obtain ALL historical token transfer events for an address using Python [duplicate]

I would like to exhaustively obtain all token transactions for a specific address. Etherscan's API returns only the last 10,000 transactions in this way: Get a list of "ERC20 - Token Transfer ...
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“null” function name decoded from ethereum transaction, which function I executed on earth

question hi, I got a ethereum tx decode like this I don't know why there's a function named "null", I look at smart contract, no function name is "null". so I am confused, which ...
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Reason for a transaction and 2 cancelling transactions being stuck?

I sent a transaction. Shortly after, I decided to cancel it, so made a cancel transaction (using MetaMask). After a while, since nothing was happening, I sped up the cancel transaction, i.e. sent a ...
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What's the difference between token tracker and address page in Etherscan?

As an example, let's use DAI. DAI has these pages in Etherscan: https://etherscan.io/token/0x6b175474e89094c44da98b954eedeac495271d0f https://etherscan.io/address/...
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The transaction can get from Web3j but display as failed in Etherscan

How could I get the real status from EthBlock.TransactionObject(replayPastBlocksFlowable) in Web3j as same as Etherscan? I couldn't find any status items from Web3j response, how does Etherscan check ...
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Etherscan “Write” buttons not interacting with Metamask [closed]

For some reason, I cannot get any of the "Write" buttons on Etherscan to intereact with my metamask. I made sure to "connect to Web3" before I proceed to click on the "Write&...
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How do I verify a contract that has imports on etherscan?

There is an answer from 2017 here saying that it's not possible but it's been 3 years since then so hopefully there is progress. My Vyper contract looks something like this: import ERC20 as ERC20 ...
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Cannot verify source code smart contract on Etherscan! PLEASE help me

Link for the contract on Etherscan: https://ropsten.etherscan.io/address/0x339237da476f50777da2d04b05037a805e46fcdb Arguments Type: String,String, uint8 ~ "FinanceToken", "MYFI", &...
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Transaction dropped and replaced in etherscan

I have transfered my ETH to my friend and the transaction status shows as "Dropped & Replaced" in etherscan, but it's still pending: https://etherscan.io/tx/...
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432 views

How to manually approve a token for swap on Uniswap (direct contract interaction)

I want to approve token spending on Uniswap for a token I don't own. Uniswap UI won't let me do that (instead it displays a gray out button "insufficient balance"). Seems the only option ...
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Cannot reproduce Etherscan verified compilation for 0.6.6 contract

I'm trying to reproduce the following contract compilation on Etherscan: https://etherscan.io/address/0x7a250d5630b4cf539739df2c5dacb4c659f2488d#code. Runtime bytecode on-chain I can get the runtime ...
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105 views

Transaction Error. Exception thrown in contract code. REVERT

I keep getting an error when trying to call function "setTokenAddress(address input)" Here's my contract code: pragma solidity 0.6.12; library SafeMath { function add(uint256 a, ...
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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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332 views

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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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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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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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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43 views

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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