Questions tagged [ether]

Ether (ETH) is the main internal crypto-fuel of Ethereum and is used to pay transaction fees.

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18 views

How to check when erc20 token was received in certain address

i am hosting a node and fully sync it. how i can call its api endpoints to figure out when DGX is received in certain wallet addresses.
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Transfer WETH from myetherwallet to metamask wallet

I converted some of my ETH to WETH already, on my hardware wallet. H/w wallet was conected to myetherwallet, and I can see my WETH there under tokens panel. I also created a metamask wallet and I am ...
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CLI wallet where I can pass in a Private Key and send out ETH and then delete this key?

Is there a CLI command where I can pass in an ethereum private key and send some coins to another address? I'm trying to build out a reoccurring payment system where a user can send 1 eth to another ...
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1answer
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I am using already deployed tokens in my contract

My question is if I'm not implementing ERC-20 methods in my contract, but I'm using already deployed ERC-20 contract methods in my contract, so can we say this will be ERC-20 compliant contract? ...
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1answer
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Why does Ropsten faucet show “Your account is grey listed for 0 hours and 0 minutes”?

I am requesting test ether from a Ropsten faucet, but it is showing an error. Please help me to resolve this error.
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Hourly data for Ethereum?

Is there any reliable source for hourly data for Ethereum dating back to 2017? The poloniex API only provides me with daily data - https://poloniex.com/public?command=returnChartData&currencyPair=...
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2answers
29 views

Internal contract-to-contract call

I am confused with the following sentence in the Solidity documentation: During the execution of the fallback function, the contract can only rely on the “gas stipend” it is passed (2300 gas) being ...
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3answers
19 views

Emitting Transfer Event even when there is no actual transfer

I am new to smart contracts and trying to understand it so that i can detect Ether transfers done to my user via Smart Contract. I know I can find the event emitted from topics[]. But for those ...
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0answers
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A Long list of WARNING Messages for Web3 install

I am trying to install web3 on my computer to build an app, and I get a very long list of WARNING messages... can someone tell what they mean? npm notice created a lockfile as package-lock.json. You ...
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How to search for the ethereum available token and display?

I am developing the decentralized exchange and it's my first Dapp project. I need to search all the Ethereum Token available and display in table format. On the frontend side, I am using ReactJS. ...
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2answers
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Transfer ether from one account to another using smart contract

I`m trying to transfer ether from account A to a smart contract and from the smart contract to account B. I wrote some code that approximately works on Remix IDE, but I completely got lost with the ...
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1answer
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How to build ERC20 based stablecoin?

I want to build stablecoin for my college project. I am thinking of developing ERC20 token pegged with fiat currency. Can someone please suggest me best tutorials/guides to build stablecoin on ERC20?
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1answer
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Problems calling function with web3 from python

I was trying to call a function from my python server to a contract deployed in Ropsten. This is my method in the contract: function send(address receiver, uint amount) public { require(msg....
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1answer
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Error sending ether to a a smart contract deployed in ropsten with web3 with python

I am trying to send ether to a smart contract deployed on ropsten via infura, but I am having some problems in txn. The error is "Error in Txn: Reverted". The sender account has enought ether to ...
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0answers
31 views

Solidity calldata for an array of structs

I'm trying to create the calldata offchain for an on-chain low-level call to a method that accepts an array of structs as an argument. I'm not sure how to encode the calldata for this. Here's a ...
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1answer
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I want to create a account on blockchain using web3swift in IOS app, but I am new on blockchain don't know how to do. Please can anyone help me out?

I want to create an account on the blockchain using web3swift in the IOS app, but I am new on blockchain don't know how to do it. Please, can anyone help me out?
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1answer
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giving users ETH addresses to deposit to

So I want to allow users to deposit ETH to their accounts in my website. How could i go about giving a user an ETH address to deposit to that address and then detect it and add the funds to user's ...
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1answer
28 views

Metamask TestRPC shows 0 Ether while connecting to Ganache- CLI

I've gone through various Q/A(s) of the problem of ganache-cli and metamask not linking but after trying all the solutions, still doesn't work for me. As soon as I type ganache-cli in windows cmd ...
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Whats the use of utility token if you don't want ICOs for your dapps?

You can mint coins and do your ico to get money. But what if I want an app without any ICO, will utility tokens still useful. Can't all transactions be made with already existing ether or dia stable ...
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2answers
39 views

I want the full list of ethereum smart‑contracts whose balances increased by 1000 Ethers above the past week

How to make this kind of query using my 200kb/s second Internet connection speed ? With such speed, there’s no possibility to run an archival node (except maybe with a service allowing to download ...
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0answers
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How to deploy smart contract with private wallet?

I am now deploying smart contract using ganache localhost:7545, i want to use infura ropsten account to deploy. Most examples uses Metamask, but i want use own ethreum wallet. How can i use to deploy? ...
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2answers
115 views

How to send ETH to address(0) from msg.sender address using multiple token's contracts, with Solidity 5.x?

I need the safest way for an user to send any amount of Ethereum to address(0). The amount is calculated by the contract, and there is no limit (assuming there is enough funds). All the code I could ...
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1answer
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Are there any virtual IoT simulators that facilitate the connection with Ethereum Blockchain?

I already built a smart contract for Ethereum Blockchain by using truffle; Now, I'm looking to connect my smart contract with the IoT environment. So are there any IoT simulators (platform, framework,...
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1answer
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Can i recover ethereum sent to and invalid address? [duplicate]

i've mistakenly pasted "2.5" in address field submitted a withdrawal request. can i get my coins back since the address is an invalid or the coin will be sent? I'm afraid i may loose my coins.
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1answer
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How can I unlock my account

I cannot unlock my account. I decrypted my account from encrypted accoun, and want to unlock it to deploy contract. However, I am getting this error, Node error: {"code":-32000,"message":"could ...
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1answer
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Node error when I deployed smart contract - Web3.js

I get this error when I deployed smart contract to my private chain. Error: Node error: {"code":-32000,"message":"unknown account"} This is my web3.js code. const bytecode = "...
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0answers
40 views

Web3 - cannot deploy contract to private chain has been reverted [duplicate]

I want to deploy a contract to my private chain by using web3.js, but my contract deployment has been reverted by the EVM. This is error message index.js:1437 Error: Transaction has been reverted ...
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1answer
27 views

Can a single token built on Ethereum’s blockchain be more valuable than Ethereum itself?

As in the question, from an economics point of view, is it possible to ever have a single token (REP/BAT or something completely unforeseen currently) takeover the underlying's platform market cap or ...
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Avoid upfront cost for calling own faucet?

To onboard users to a project quickly, I want to build my own little Rinkeby-faucet where users with new accounts (0 ETH) can get a bit of ETH by clicking a button. However, just calling the ...
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2answers
47 views

Exchange ERC20 token with other ERC20 token

I have 2 ERC20 tokens. The contract are designed as standard ERC20. Here are the 2 tokens to take as an example - AUDC --> Contract Address: (0xContractAUDC) Wallet Address: (...
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20 views

PGP Key in Funding Application [closed]

I am looking to get funding from the ECF Network for an Ethereum project. They ask for a PGP key under the apply form ("Please make sure you paste your pgp public key here: ", but nowhere on their ...
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1answer
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Create2 and new contract deploy at used address

Given that it seems possible, using somehow CREATE2, to deploy a new smart contract at a certain address where a different smart contract existed before to be killed... (see @smarx answer here Can ...
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1answer
39 views

How to solve the error “”before all“ hook: prepare suite:” [closed]

When I tested my contract, I got this error ""before all" hook: prepare suite:" Does anyone know how to solve this error? This is my dependencies. "truffle": "5.0.7", "web3": "1.0.0-beta.46"
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Inconsistent responses with 'eth_getTransactionByHash' through RPC API. Can anyone help?

I have been using the requests library with python to query the geth/rpc api in order to get ETH transaction data. I connected to geth via "geth --rpc --unlock TESTINGADDRESSWITHNOVALUE --allow-...
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Can we treat/launch private ethereum chain ethers as a CryptoCurrency in Market?

Warm Greetings! I have a private ethereum blockchain setup on my server with multiple nodes , Also running mining software to mine blocks and earning private ethers (no value in market). Can i ...
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0answers
38 views

Can not tranfer eth with solidity and web3js

Error when I try to send eth from fontend react to smart contract and from contract I tranfer eth to another address but it error, when I try it in remix then it total work. I user web3js to call ...
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1answer
44 views

How big is the Geth Fast Node Currently?

I am trying to embark on getting all the contract addresses pulled from the Ethereum blockchain. From what I read, a fast node is all that is required for this (getting blocks->txns->contractAddress ...
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3answers
161 views

How do I make a smart contract send a message to a user along with a transaction?

Smart contracts can obviously send transactions through the Ethereum network but can they also send a simple message along with the transaction? Usaully you would put the message into hex code in the ...
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2answers
47 views

Get All Contracts from Blockchain

I am developing a large database of exploitable contract addresses and creating a website to host such a database for users to use to see if contracts are safe. Is there a way to get all contract ...
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1answer
28 views

How to reach to one chain when hard fork is performed?

Assume that reward policy of Ethereum is changed from 3eth to 1eth. Hard fork is ongoing but, there are miners who don't consider updating their software. what happens? The miner who did update ...
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1answer
61 views

Can't transfer ether from contract to another contract ^0.5.0

I try to transfer ether from one contract B to contract A. But I get "Transaction mined but execution failed" Code: pragma solidity ^0.5.0; contract A { address payable public owner; uint ...
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0answers
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When use Nethereum C# Library there are many CLOSE_WAITs in TCP Stack at node side

When I use Nethereum methods (GetBlockWithTransactionsByNumber,GetBlockWithTransactionsByNumber and etc ) in loop, In TCP stack at node side accumulates a lots of CLOSE_WAIT. How can I fix this issue ?...
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2answers
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Transaction stuck in “Pending”

I've sent some ETH from the Ledger Live app to an exchange but I only used 1 Gwei and now the transaction is pending. It's been 20 hours. Will the transaction run out of gas eventually or will it go ...
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2answers
41 views

ParserError: Expected pragma

Hi guys. I have got one big problem. When i try to compile my code i'm getting some kind of unusuall error. I think everything is ok but when i try to "node compile.js" my main file ("inbox.sol") ...
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1answer
51 views

What I need to verify contract with open-source license?

i m deployed contract in etherscan mainnet. i m verify it with open-source license like (MIT, GNU). now the problem were i don't know were to define license in etherscan ?? and etherscan will validate ...
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PFeast : what’s that token?

While everyone can create a token, this one seems to have attracted a lot of value from third party users (current ether balance place it in the top 500 and with more than 9000 users). By ...
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3answers
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Response stuck when creating contract

I am creating a contract on my local blockchain network using web3. On my node , contact is created and address is generated. But on node application, response is struck. Here is my node code: ...
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1answer
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Relationship with smart contract and block confirmation

I have known Bitcoin need 6 blocks for confirmation. However, In ethereum, It is different depend on clients By this post What number of confirmations is considered secure in Ethereum? It takes ...
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1answer
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Cryptocurrency payments in Centralized Architecture

I'm new to cryptocurrency, so not sure if I'm asking the right question on this... I want to develop a game with traditional centralized client/server architecture, probably java application server, ...
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1answer
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How will I determine the number of nodes required to run my private Blockchain Network stable?

I am designing a use case where millions of users will be using it and is expecting a transaction rate of 50 per second. I am looking forward to have it on Azure.