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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why creating new wallet doesn't cost any gas, though its using network storage to store account details?

Creating new wallet doesn't cost us any gas, but the account state and account information is stored in Ethereum blockchain, which is using networks storage and as we can see the details of account in ...
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fetching metadata from Ethereum

I've been struggling using web3j for getting metadata or details like name, description, and properties like the image shown bellow. I know that using web3 will be similar like export async function ...
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Can Data of TX With Contract Be Tracked If No Event Is Emitted?

Given I interact with a smart contract and provide data. All transactions on the blockchain are recorded, but is unindexed data which is never emitted as event also readable to all (e.g. on scanners)? ...
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Can ABI be uploaded to Etherscan without source code?

Is it possible to only upload a contracts ABI without including the source code? If so, how? Curious if Etherscan can still be used to interact with the smart contract, but not make the source code ...
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Encrypted Calldata

https://bscscan.com/tx/0x1b30d12030e384eea6c608f28c889eb945e5e80c880c2ebd648b88aea3187bd0 I have found an account that sends encrypted calldata to a contract and then contract makes swap on ...
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Get Limit Price from thegraph limit price order

Trying to get price from limit order that was been summited to contract but when call theGraph query: https://api.thegraph.com/subgraphs/name/gelatodigital/limit-orders-fantom-ii/graphql, I getting ...
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Get an NFT's last sale price

How can I fetch the last sale price for an NFT? Basically need to do this for all the NFTs in a collection. Finding out the real cost price of all owners in the collection at this moment. What's the ...
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ETH not showing in Coinbase Wallet after using Uniswap

I used Uniswap to "swap" Boost Coin (was paid in this for assisting with the project) to ETH. To clarify, this was using the browser on Coinbase Wallet app, not regular coinable. When I look ...
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How to get state of transaction from ethereum blockchain via an API

How to get state of transaction from ethereum blockchain via an API is there any API to fetch the State of the transaction
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how to index the changes of the eth and tokens in the sender account after a transaction execute

how to index the changes of the eth and tokens in the sender account after a transaction execute?is there a tool to do it?like the etherscan,https://etherscan.io/tx/...
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How much ether was transferred in this transaction?

Is there any way to determine how much ether was transferred in the following transaction? If so, how much was it? Transaction of interest { "hash": "...
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BSC testnet showing weird input parameter names

My token smart contract has a "bridgeSend" function, which i wrote custom by myself. The function is basically just a wrapper around the transfer function. It allows users to send tokens to ...
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Stack underflow (0 <=> 2) when creating new smart contract

I'm developing a contract and a Web 3.0 using Hardhat, Ethers.js, Node.js and Web3.0 (Metamask) to do ETH smart contracts and transactions and I'm getting a rare error when trying to execute the ...
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Deployed contract with Remix, and trying to verify contract on Etherscan after few weeks but Bytecode doesn't match

I've been reading as much around this as possible, but cannot verify a contract which relies on openzeppelin imports, because the compiled bytecode differs from the deployed bytecode. I deployed an ...
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How to get ERC standard of tokens in a transaction from transaction hash?

Is it possible to get the ERC standard of tokens in a transaction from transaction hash? Etherscan provides the list of tokens and the token standards as shown in the image when we search using ...
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Analyzing ethereum transactions based on addresses

i am a total noob to the ethereum world but come from an AI background. I was interested in analyzing the transactions on the blockchain using etherscan APIs. I wrote some basic code to extract the ...
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hardhat verify contract faild! Help!

I use command npx hardhat verify, and the log is: Nothing to compile No need to generate any newer typings. Successfully submitted source code for contract contracts/ygu/yguToken.sol:YGUToken at ...
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How to interact with a smart contract with ethers.js?

I need a general-purpose method to call functions from a smart contract using ethers.js. I've always used web3 and I'm trying to transition over; however, I cannot find any good examples of calling ...
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What are these ethereum contracts with bytecode 0x and why are there so many of them?

When digging through on-chain data I found a number of smart contracts with bytecode 0x. They seem to have failed creation but show up on etherscan with bytecode. I'm counting ~33k of these. Any idea ...
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What are the default Etherscan readable methods?

I am deploying NFT contracts on EVM compatible networks with an "etherscan" tx scanner. I can see that sometimes the method of the tx listed is an alphanumeric string like 0xc203b6b8. But ...
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Referencing OpenZeppelin in Solidity Contract, working with Etherscan

I think I am making a simple mistake, but I have been stuck for a while. I have a simple ERC-20 contract which I have publish on the Ethereum Mainnet and others on Polygon. This is a sample contract ...
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How to query all erc-20 contract addresses

Is there an easy way to search the chain (or maybe an off-chain source) for a list of all erc-20 tokens? Similar to how etherscan did it here
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How to run bootnode in public IP in Ethereum Blockchain

How can I run bootnode with my public IP address? I am running following command. bootnode --genkey=boot.key bootnode --nodekey=boot.key --writeaddress bootnode --nodekey=boot.key --addr:$(...
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Automatic verification of Smart Contracts deployed from another Smart Contract

I have seen an Smart Contract that deploys new contracts, which are automatically verified in etherscan without doing anything special: Contract contract = new Contract(a, b); The contract is ...
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How do you identify the start of constructor arguments for contract creation code?

How is contract creation code output for modern versions of solc? Where can I find the exact transaction data format? I want to be able to quickly identify where constructor arguments start, as well ...
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Discrepancy between "Transactions" and "Erc20 Token Txns" on Etherscan

I am looking at this particular wallet address (0x2138a12520c9b45bb4b2c742923b514d5f662fec) and it shows that there are only 2 regular "Transactions" but 13,263 "Erc20 Token Txns" -...
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Is it possible to view the source code of dependencies of a contract in Etherscan?

Let's take this contract on Etherscan as example. After Open Zeppelin dependencies, we found this: import "./ERC721A.sol"; import "../interfaces/IMerkle.sol"; import "../...
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How to get transfers and holders in one contract by etherscan.io

My dear friends: I am a beginner in ethereum development,And i have a problem and I hope I can get help. I signed up with EtherScan and got a free key and some data from the API. Their API experience ...
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swap Tokens fails due to TRANSFER_FROM_FAILED

I am trying to test a code on rinkeby test network and I am trying to buy DAI tokens using WETH tokens. I have weth on my account (0.5) and I have ETH on my account as well (0.1). to sum up. I get an ...
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Flash Loan Transaction Pattern

I am trying to understand Flash loan and identify the patterns for those transactions. In my research, I found out that Uniswap Flash loan transactions can be identified from mainly three criteria. (1)...
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crawling last transactions

I am making a program to monitor who is sending ether to my wallet. I thought I could get the most recent blocks this way, but the repoFactory was empty. What could be the problem? i want to crawl ...
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How do I get Ethereum contract address from Etherscan API?

I have followed the documentation supplied here under "Get a list of 'Normal' Transactions By Address" : https://docs.etherscan.io/api-endpoints/accounts#get-a-list-of-normal-transactions-by-...
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NFT minting - Warning! Error encountered during contract execution [Out of gas]

I was encounter this during mint . from what i google , its seem more rlevant to minter (msg.sender) gas limit too low and cause this issue. However ,there are still not working to increase gas limit ...
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What is the fastest way to filter live transactions

I'm trying to capture live transaction data using the etherscan api and filter them based on the transaction "Method" (i.e. to be able to capture NFT transactions and see new NFT contracts ...
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Metamask mint fee too high

I have mint function written in solidity: function mint(uint256 _mintAmount) public payable { require(!paused, "the contract is paused"); // false in this case uint256 supply = ...
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Smart contract function works in Remix but not in webapp or etherscan

I have a smart contract with a function that returns the correct value when running the function calls directly from remix. However when I try to call the function in a web app or from ether scan I ...
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Do you lose miners tip (priority fee) when transaction is reverted?

When a transaction fails or gets reverted do you lose miners tip aswell as gas fee? Also when it says "Error: internal transaction reverted" does that mean I got outgassed by someone else ...
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How to interact with mainnet smart contracts by GOlang?

Please tell me an example of code in GOlang that connects to the contract and checks the balance of the ERC20 token / transfer tokens / gets the name of the token. I looked for examples and did not ...
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Sent my Shib to the smart contract address

I sent my shiba inu to the smart contract address somehow. Is it possible to get it reversed or to get my funds still?
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Very high gas for simple function call only on mainnet

This is a quite simple contract. Everything works fine, both locally and on rinkeby testnet. Average gas cost for enrol function is around 250,000 gas units. On mainnet it spikes a lot without an ...
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Executing Uniswap Swap [swapExactTokensforETH] Contract on Etherscan

I'm looking to execute a uniswap swap from some scam altcoin to ethereum on etherscan. When trying to do so on the uniswap UI, it never prompts metamask to confirm the swap. Is it possible to execute ...
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How to view source code of contracts in etherscan

I'm doing a hobby project and as far as i know source code of contracts published in Etherscan are publicly available and can be seen here like for Tether but some tokens only have the options to ...
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Why do running hardhat tasks in javascript require a colon?

I am running hardhat-etherscan to auto verify smart contracts after deploying them. According to the documentation, you add a little colon in between the word verify and add the word verify again. ...
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Transaction underpriced on Metamask?

I'm trying to burn one of my ERC721 tokens in my deployed contract but as you can see from my image the transaction fails with that error even if I did not touch anything when metamask prompts me to ...
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Sandwich Attack: Why do they use so high gas fees on sells?

I am currently watching into vulnerabilities and different threats for DEXes. I found some sandwich attacks or front running, that use moderate-high Gas Fees on Buy and crazy high Gas fees on the sell....
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approve() function DAI on rinkeby

Cloned Rinkeby test network on local and trying to add liquidity to DAI-BAT pool after creation of the pool. Here is the addLiquidity function for reference: pragma solidity >0.7.0; //import the ...
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Investigating an incomplete ETH address with 6 words or less

When investigating an incomplete ETH address on Etherscan we can write the first words and the search bar then autocomplete the rest and lists addresses starting with these words. But it does that ...
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Approve a single token ID in ERC1155 token standard

I am facing an issue when i am trying to give approval to the operator to burn my token in ERC1155. The issue is i want only to give access to the particular token id with a particular amount. But ...
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How to get a list of all addresses that received an airdrop on ethereum

How can you find the list of addresses that received an airdrop from a certain coin in Ethereum? For example, I would like to find all of the addresses that received the LOOKSRARE airdrop.
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Why my token transfer always 0 for smart contract 1155

I have a smart contract in solidity 1155 and am new to learning this blockchain system so do pardon me for asking weird questions. Am using metamask for transactions and my testnetwork is Ropsten. And ...
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