Questions tagged [ether]

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

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1answer
100 views

Watching the transaction of an external account using smart contract

Is their any way to execute a function of smart contract whenever a transaction to a predefined external account occurs? I mean if someone transfers some ethers to account A, a function of a smart ...
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1answer
138 views

Ether balance on Metamask doesn't change after selling tokens

I create a smart contract successfully using Remix IDE , Metamask and Ropsten for testing. I want to sell some tokens using Sell function, so I specified the value "20" for Sell function ,my initial ...
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1answer
109 views

Use ENS with MyEtherWallet.com

When starting an auction for an .eth address on MyEtherWallet.com am I automatically placing a bid on the address or do I have to manually place a bid afterwards (and pay 0.01 ETH AGAIN)?
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1answer
143 views

Unable to send ether to account

I am trying to send ehter using this code web3.eth.accounts.wallet.add(privateKey); web3.eth.sendTransaction({ to:someAddress, from:onwer, value:amount*1, ...
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3answers
199 views

Error when trying to add a payable function in erc20

Most of the ERC20 examples on the internet have this function: // ------------------------------------------------------------------------ // Don't accept ETH // --------------------------------------...
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1answer
308 views

The use of ERC20 tokens in a private ethereum network

I am being told to use a private blockchain instead of the public one in attempt to cut gas cost. But I was hit with the problem of the value of ether and tokens in this private blockchain. I am ...
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1answer
36 views

Store and Display the Json file in Blockchain

I have stored my data on firebase, and taken as a JSON file, the JSON should be separated and display into the webpage through the Ethereum blockchain, for example: { product: "Shoes", prize: "85"...
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1answer
27 views

Can I make an ethereum token that runs a certain function every 15 seconds?

I have a rinkeby token, and I wanted to add "merged mining" when someone mines a block, they get awarded 0.25 of that token. function issueBlockReward() { balanceOf[block.coinbase] += 0.25; The code ...
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1answer
217 views

Ganache not working

I am developing on a testnet on ganache and using remix. I am working with web3 and working on the user interface. when trying to fetch a function with web3/ganache, I get the following error: "...
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1answer
20 views

Does metamask uses web3?

I was curious if metamask uses web3 for communication with eth node ? I tried google for it; showed bunch of other results but didn't precisely answered my question. Indepth answer on how metamask ...
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0answers
20 views

smart contract not completed

I was supposed to receive payment through a million money ethereum smart contract. The transaction was made by my downline and it shows on my http://lk.million.money office but it did not show on my ...
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2answers
23 views

Token Sale Smart Contract

I am new to Ethereium Block Chain and have been trying some code written in solidity as follows. pragma solidity ^0.5.0; import "./MyERC20Token.sol"; import "./ERC20Burnable.sol"; contract ...
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1answer
19 views

VM error: revert. Try to send ether from contract to another contract

I just facing a little issue here in sending some ether from Sender contract to another contract Escrow by msg.sender value. Btw, I'm executing code on Remix, and specify the value from the sender ...
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1answer
28 views

How to avoid gas fee by sending ETH automatically from HDwallet addresses to my specific ETH address

I have created ETH HD wallet and want to send all coins received on those HD wallet address to an admit ETH wallet , this is easy but problem stands as I want to send the ether without any gas fees. I ...
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1answer
135 views

Transfer of funds from etherli to poloniex

I can not make the ethereum transfer from the etherli wallet to my poloniex wallet. The message is: "Please fund your user account with sufficient ether (~0.01 ETH / tx) for gas (transaction fees)" ...
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1answer
148 views

How can i watch multiple smart contracts on server

I would like to create a sever that continuously watch the events of multiple smart contract at once. Sending me an alert via email when an event is detected. I understand that there is a web3.js ...
0
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1answer
154 views

Unable to change contract data with nodejs (web3)

I created a contract, and deployed it into my private blockchain, as you can see I use mapping and dynamically allocated array. When I am trying to add a domain by 'addDomain' method with remix web ...
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1answer
15 views

Smart contracts, tokens and ether

I am sending some ethers and tokens to my smart contract. So how will the contract differentiate between ethers and tokens? Code will be helpful
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1answer
19 views

Transfer ethers from a smart contract to another smart contract in Truffle

I am beginner in Solidity, So my problem maybe simple. I have two contracts "BankA" and "customer". Whenever i deploy BankA in Truffle network and call pay() the following Error will emerge: Error: ...
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1answer
304 views

Need to prove quantity/date of Ether Pre-Sale purchase for tax reasons

Lucky me - I bought 10000 Ether for 5BTC in the pre-sale and forgot about them until just recently. Yahoo! However, now that I've sold some at a profit I'm going to need to prove the date and quantity ...
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1answer
121 views

Question about sharding

I'm reading the white paper, more specific about scaling. I'm stuck on the second strategy. Second and more importantly, however, we will include an intermediate state tree root in the ...
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1answer
20 views

ParserError: Expected identifier, got 'LParen' in Remix simple auction using Solidity

The line highlighted in the error is require(bid2 > highestBid2); The code: pragma solidity ^0.4.22; contract SimpleAuction { address public beneficiary; uint public auctionEnd; ...
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1answer
51 views

method personal_signTransaction not supported

Good Time I'm trying to test a smart contract in local ethereum wallet with connecting to the ganache-cli but when I try to create a wallet contract it gives me an error: method ...
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1answer
21 views

Do I absolutely have to do mining to make transactions done on testnet?

As I know, we don't have to mine to make transactions done in Bitcoin testnet, but in ethereum testnet, we need to mine to make them done. Are there any ways to make them done without mining?
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1answer
19 views

It is possible to run out of gas when calling bytes32[]?

Is possible to run out of gas when calling bytes32[], even when count e.g. 1k entries?
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2answers
66 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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3answers
928 views

How to do approve and transferFrom for Ether?

With regular ERC20 tokens we have method approve(to, amount) and so I can approve to someone to take specified amount of my tokens later with transferFrom(from, to, amount). Is there any way to ...
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1answer
119 views

How to verify my account in order to use the Kovan testnet?

I am new to parity and kovan-testnet. I have to verify my account in order to receive keth. I am confused as to where to execute the following code: curl http://github-faucet.kovan.network/url --...
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2answers
103 views

What parameter type should I use for contract methods that specify floating point amounts?

In my dApp the user sets the entry fee for the game they are creating. The entry fee for games will usually be between $5 USD and $50 USD. What unit should I use for the contract method that accepts ...
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3answers
667 views

Deploy the ethereum contract token and transfer to other address using node js web3

Deploy the ethereum contract token and transfer token from one address to other address using node js web3.Anyone please help me.
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0answers
12 views

Create an account and assign it to end-user, and append more information to public-profile

So, I've setup a private ethereum network and plan to use uPort for better user identification for end-users. So basically I have two questions: 1- Is it possible to provision an account and its ...
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2answers
24 views

My ether was automatically sent to different address without my permission

My ethereum account is 0xfAd956B56be1298ee8ec1950cc305B46268d926f (generated by metamask) and the moment friend of mine sent me an ether, it was automatically directed to another account. This is the ...
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0answers
30 views

Oraclize ( provable) updates the value only one time

I'm trying to write a smart contract that gives me the current timestamp. The very important part is that i want this to happen locally, not on test networks. After some research, i installed ethereum-...
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1answer
37 views

eth.getBalance(eth.accounts[0]) Shows me 0 balance though my syncing is still Running [duplicate]

I am using geth on windows with 1.9.10 version. I used geth --rinkeby --rpc --rpcapi="personal,eth,network,web3,net" command for launch my geth. I am on the Rinkeby testnet, i already transfer 3 ...
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1answer
17 views

Getting revert error on transfer ether to wallet address

hi i m calculate the ether value with token price and quantity of tokens and than sending calculated ether value to seller account but i am getting revert error on remix at escrow.originatorAddress....
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0answers
25 views

Exiting out of a smart contract early?

Basically i want to have a smart contract that can allow users to exit early under specific conditions. Does anyone have any resources for this or know whether its possible?
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1answer
28 views

How i can exchange the erc20 with ether

i want to make crypto to crypto smart contract where i need to sell erc20 token and on buyer side i need to calculate the price which i have to send to seller and i have a price of token can you ...
0
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2answers
35 views

How to calculate the token price of already deployed ERC20 tokens

I am creating a smart contract, so inside that I have to pass the token in contract and the value of ether will be calculate on behalf of token price please help.
0
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1answer
47 views

How to Open console In geth 1.9.10

I am currently using geth in windows and 1.9.10LTS version of geth. I have to Open geth console, but when i try to implement geth console or geth attach or geth attach ipc:\\ .\pipe\geth.ipc it doesn'...
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3answers
304 views

How do I transfer Ether from multiple account to one account?

I have a vast amount of Ethereum wallets, all packed with Ether. I need to transfer all the Ether to a single account. I don't want to do it manually. Is there a way to script it or use a smart ...
0
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1answer
193 views

Can't send ether to crowdsale contract (fail) + infinite gas bug on Remix

I'm a newbie trying to make a crowdsale contract in Ropsten (deployed a token contract very well before) but i meet some problems : I can't send ether to crowdsale contract, returning a fail status ...
2
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1answer
238 views

Does it make sense to have a Node.js backend serving json to frontend for dapp?

Currently, the architecture I am looking at is that the smart contract (SC) sits on the ethereum network, but it is a complex and multilevel contract system. Just navigating through the tiers of the ...
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2answers
713 views

Ethereum wallet/Geth incredibly slow to sync, help?

So I've noticed some people having the issue similar to mine, entitling their post as "very VERY slow to sync" and other variations of that, however they're complaining at around 100 blocks every ...
0
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1answer
55 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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2answers
401 views

I cannot send ETH from my blockchain wallet

Yesterday i have Transaction {Dropped & Replaced) https://etherscan.io/tx/0xfdca0e5c597f0a3f298afd5d56e939a8cefc10117df6b22d5342e1b6d5803caf I saw it Replaced by TxHash:...
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1answer
877 views

ETH stolen from two MEW wallets & moved to an unknown address & then to ShapeShift

I recently found out that my ETH funds were stolen from two MEW wallets and moved to an unknown address. Below are addresses of my two MEW wallets. 1) 0x16bf750Ee569F0A173BCCfD7b3F92F9Bb46c6AfC (...
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1answer
1k views

Web3 sendSignedTransaction Transaction cost

I'm new to Ethereum world. I've just manage to create an example that calculates transaction fee and sends a signed transaction without a contract using Web3js library. My issue is that my test ...
0
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1answer
277 views

How to download the whole transfer records of a token

I want download the whole transfer records of a token. https://etherscan.io/token/0xB8c77482e45F1F44dE1745F52C74426C631bDD52?a=0xd551234ae421e3bcba99a0da6d736074f22192ff. But the default setting is ...
2
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2answers
419 views

Help-A-Noob-With-Ethereum-Wallet-Blockchain-Download

I'm on a 2013 Macbook Pro / 16 GB ram / 512 SSD / 2.3 GHz I just transferred 3 ETH from my poloniex account to the Ethereum Wallet on my local machine. The thing is, the entire blockchain hasn't ...
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2answers
262 views

Compile error when trying to import web3.swift

I am trying to import web3swift into one of my Swift files, but get the compiler error "No such module 'web3swift'". The import statements look like this: "Import Geth" "Import web3swift" In my pod ...

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