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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Ethers.js: Error when calling symbol() on Maker (MKR) contract but no problem for other ERC-20 token contracts

I'm running into an issue using ethers for an address tracking app I'm building. Whenever I make a call using the generic ERC20 ABI I've written in my code (I am only needing to retrieve the symbol ...
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ETH address with 35 leading zeros transacting?

I've noticed several addresses receive AND SEND tokens in Ethereum which have an uncomfortably large number of leading 0s. [1] I thought all transfers had to be signed by a private key that ...
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How to get the total value of a address including tokens other than ETH

Is there a way to get the total value of a ETH address, not only its ETH value? I know Etherscan shows this on their website but I don't know if there is an API where I can grab this data, preferably ...
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Where are contract functions implemented on bscscan verified contract

The following functions are defined on a contract posted on BSC scan; however, the implementations don't seem to be available. contract Acc { function acc_Transfer(address from, address to, ...
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Is A New Instance of an Already Verified Contract Considered Already Verified

While testing some deployment and verification scripts, we deployed a smart contract and verified it on testnet etherscan. Then redeployed the smart contract again and tried to verify the new contract ...
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How do I send my custom erc20 token from ethreum to arbitrum?

I am trying to send my custom erc20 tokens from ethreum (testnet) to arbitrum(testnet) through arbitrum bridge. But not sure if I had to map my token first or arbitrum bridge does that itself? How ...
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I am misunderstanding the gas data i'm seeing. Where is my disconnect?

I must be missing something. Maybe someone can help me see where i'm misunderstanding. Forgive me if this question has been asked already. I'm seeing some adjacent questions but haven't been able to ...
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What are these 2 transactions with the same hash and different values?

I am browsing some erc20 transactions from a given ethereum address on the Etherscan API module account and action tokentx. Example here : Sometime I observe 2 consecutive identical result except ...
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Trying to get the trasnaction information by trasnaction hash. Getting error

Im tryint to get the trasnaction ifnormation by the trasnaction hash. thats the code im using atm. web3.eth.getTransaction(web3.eth.getBlock(299394)[0], (error, result) => { if( ...
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Etherscan contract not updated even though contract updated

New to solidity. I updated my contract, but the changes and new functions are not showing in etherscan. is this normal?
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How to get failed transaction status code by using python web3?

Given transaction hash, i want to fetch Status code ('45' in this case, refer below image) with which transaction has failed using python web3.py. I already tried these methods, they don't seem to ...
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How much data can I read from Smart contract, Is there a limit

We are aware that reading data is free from the Ethereum Blockchain. Is there a limit to the amount of data I can read? If someone runs a never-ending loop on the call, WIll block chain still give ...
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How to show my erc20 coin custom logo everywhere?

I am planning to launch my custom tokens on polygon. I want to add a logo to my coin and after a while I want to change my token logo. I have understood that there is three ways to do that - Manually ...
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How do I keep my custom token secure?

I am planning to launch my custom token on polygon. But little skeptical about. After the deployment of erc20, token comes to my account. But it feels little insecure to keep all coins on an account ...
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How to differentiate 'normal transaction' values from 'internal transaction' values, avoiding duplicate values

I'm aggregating data from the Etherscan API and I'm trying to add all normal transactions and internal transactions together and then calculating the balance of ETH for a wallet based on the past ...
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How to make my erc20 token all time visible on meta mask wallet along with a logo? [duplicate]

So I have cteated an erc20 tokens on testnet and planning to launch it on Polygon. But the token is not listed on any market place. Without importing the token using contrat address, token is not ...
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How to find the NFT transactions To an address from Etherscan website

I am trying to find out the NFT transactions TO an address using Etherscan website. It may be an API or a manual search. But it has to be an NFT transaction. How can that be done?
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How to add a logo or icon for erc20 crypto token?

I am planning to launch my own crypto tokens on polygon. But couldn’t understand the process properly of how to upload logo for the token. Also I don't think on testnet I can test it. Is there any ...
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How to convert 5 ETH worth token to another blockchain wrapped ETH without actually converting tokens to ETH

So this is the example: we have 100 X Tokens on Etherium mainNet, which let's say has the value of 5ETH. Now I create Wrapped ETH on BSC and the Wrapped ETH price is same as ETH. (peg to ETH). Now I ...
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Is there a multi-call equivalent for calls that aren't made to a smart contract?

I have an array with a bunch of events. I get the block number from these events but I also need the block.timestamp which isnt returned in the event object, its returned by getting the block. So I am ...
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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 [duplicate]

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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