Hottest Questions This Month

1

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154

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How two untrusted parties can make transactions without any involvement of the third-party?

answered Jan 12 at 19:33 Mad Jackal 548

3

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2

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105

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What economic incentive does anyone have to mine Ropsten and other networks?

blockchain mining ropsten economics cryptoeconomics

modified Jan 7 at 10:26 The Renaissance 764

1

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3

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53

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What are the risks of DeFi lending?

defi

answered Jan 14 at 10:33 Mars Robertson 765

2

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1

answer

91

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Do all Ethereum networks return the revert reasons as a “message” field?

json-rpc testnets revert-opcode

answered Jan 20 at 10:21 Paul Razvan Berg 5,406

0

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1

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188

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Why isn't Polka Dot listed for trading on Uniswap?

exchanges uniswap decentralized-exchange polkadot

answered Jan 17 at 11:40 AvocadoChocolate 98

2

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1

answer

113

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Calculating Ethereum Gas Fees

transactions ether etherscan fees

modified 2 days ago Undead8 81

0

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2

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32

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Can you ! a modifier?

solidity modifiers

modified Jan 15 at 5:13 Rob Hitchens 41.9k

2

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1

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94

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what stops devs from changing supply of contracts?

solidity erc-20

modified Dec 26 '20 at 9:13 goodvibration 19.1k

2

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2

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51

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How do I withdraw Ether from my Chainlink node

wallets chainlink

answered Jan 12 at 22:20 Patrick Collins 1,482

1

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1

answer

89

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Recovering private key from keystore file

ether private-key keystore password

modified Jan 5 at 19:59 Swinks95 11

1

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1

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53

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Which fork implemented EIP-141? (invalid opcode)

hardforks forks eip invalid-opcode

answered Dec 28 '20 at 0:11 FiguresNice 46

1

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1

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41

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Which component sends a transaction and which component subscribes to an event?

go-ethereum web3js transactions blockchain events

modified Jan 21 at 15:39 EMANUEL 51

1

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1

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85

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THETA token sent to contract address instead of correct wallet address

contract-development blockchain ether etherscan myetherwallet

modified Dec 30 '20 at 20:06 Shane Fontaine 7,985

0

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2

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85

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Got hacked on metamask. Which wallet has the best security to trade on Uniswap?

ether metamask

answered Jan 18 at 14:34 Rye 1

0

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1

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39

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Recovering ETH after sending to wrong address

contract-development ether etherscan recovery

modified Jan 16 at 18:38 user66233 1

2

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1

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61

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How exactly are block rewards calculated in ethereum?

ether

modified 13 hours ago Nulik 2,330

1

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1

answer

68

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Chainlink: Data in JSON object not returning

solidity chainlink

answered Dec 29 '20 at 13:42 Thomas 35

1

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1

answer

52

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Web3: current best practice to connect Metamask to Chrome?

web3js metamask

answered Jan 9 at 23:33 Morten 2,271

2

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0

answers

84

views

How to get token prices with UNISWAP API

erc-20 etherscan python uniswap

modified Jan 10 at 16:46 Itsjonie 45

1

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2

answers

63

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issues after removing window.web3

web3js web3-providers

modified Jan 13 at 22:34 Mateusz Pabian 1

0

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1

answer

47

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myContract.events.MyEvent() vs web3.eth.subscribe('logs', …);

web3js events logs

answered Dec 29 '20 at 3:18 Steven V 866

2

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2

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35

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Who is the msg.sender when calling function of ERC20 token contract inside a smart contract?

solidity

answered Dec 31 '20 at 16:42 DarkWinter 21

0

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1

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73

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Sent ETH to ETC address within Ledger Nano S. Confirmed on Etherscan, but not appearing in Wallet? [closed]

ledger-nano-s

modified Jan 15 at 1:12 Morten 2,271

1

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0

answers

72

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Why is the allowance 10**8 inside the test but equal to zero in the smart contract?

solidity erc-20 testing erc-721 allowance

modified Jan 1 at 13:31 Donnoh 43

0

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2

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71

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Metamask (and other wallets) don't show tokens on balance despite of transactions are in blockchain

tokens erc-20 metamask bip39 tether

answered Jan 11 at 14:27 The Renaissance 764

0

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1

answer

53

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How to send ERC20 token to smart contract in constructor

solidity

answered Dec 27 '20 at 20:03 Lauri Peltonen 14.2k

0

votes

1

answer

53

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Can't call “addLiquidityETH” Uniswap function from my contract

solidity remix uniswap

modified Jan 20 at 7:42 Paul Razvan Berg 5,406

0

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2

answers

53

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I sent Chainlink Link tokens to my ethereum address, how can I recover? [closed]

tokens chainlink

answered Jan 16 at 19:21 Torus77 1

0

votes

1

answer

52

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How to start mining Ethereum [closed]

mining wallets

answered Dec 28 '20 at 12:12 Suryakant Gupta 30

0

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1

answer

52

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Hello. I have a problem with a smart contract transaction between users. Error: gas is missing

web3js javascript

answered Jan 10 at 3:39 Ismael 23.8k

3

votes

1

answer

31

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Explain “griefing” attack on Aave flash loan

security flash-loans aave

answered Jan 18 at 11:01 David T 166

0

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2

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29

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Do view functions cause reentrancy vulnerabulity?

security interfaces reentrant-attacks vulnerability view

answered 2 days ago Undead8 81

1

vote

1

answer

60

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What is the difference between MATIC and POS-ERC20 option in this faucet? [closed]

testnets faucets

answered Jan 2 at 17:14 Nitin Mittal 1

1

vote

1

answer

46

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How to use Chainlink with Truffle/Ganache?

truffle chainlink

answered Dec 30 '20 at 1:15 Patrick Collins 1,482

2

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2

answers

35

views

What is in return when listening to an event?

solidity web3js ethers.js ethersjs

modified Dec 29 '20 at 18:57 Peri Kost 86

1

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1

answer

35

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What is the use case of transferFrom function in ERC20 token contract?

solidity erc-20 erc-20-approve

modified Dec 28 '20 at 15:36 user938363 341

0

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1

answer

44

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How to create a smartcontract for bounties on github?

contract-development

modified Jan 5 at 22:03 a.t. 101

1

vote

1

answer

34

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using only html page for frontend with web3 or ethers.js

solidity web3js dapps ethers.js frontend

modified Dec 27 '20 at 10:12 Sergi Juanati 669

1

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2

answers

43

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ChainLink oracles - are they free to use? Is there an oracle alternative onchain?

oracles chainlink

answered Jan 4 at 15:16 Patrick Collins 1,482

0

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1

answer

53

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What is the difference between collateral types ETH-A and ETH-B?

dai

answered Jan 8 at 0:18 Newskooler 125

2

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0

answers

52

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Problems calling Smart Contract function in Java using Web3j

contract-invocation infura web3j

modified Jan 5 at 21:03 Xenonite 107

1

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2

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40

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Unable to Deploy/Migrate to Mainnet via Truffle/Infura

contract-deployment gas-limit gas-price truffle-deployment mainnet

modified Dec 29 '20 at 22:54 g.a. mercado 21

0

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1

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40

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getting Error: Invalid JSON RPC response: “” when calling getBalance from web3 js library

web3js json-rpc

answered Dec 30 '20 at 15:39 FreddyCoen 11

0

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1

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31

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Is it Possible to Prove Who Sent Funds to Particular ETH Address?

transactions blockchain gas fees

answered Dec 28 '20 at 19:49 Lauri Peltonen 14.2k

0

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2

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31

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Contract Call has been reverted by the EVM with the reason: 'execution aborted (timeout = 5s)'

go-ethereum web3j

answered Jan 6 at 5:29 Haseeb Saeed 480

0

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0

answers

51

views

Error: invalid arrayify value when deploying in remix [duplicate]

solidity

asked Dec 30 '20 at 7:43 user938363 341

0

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1

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39

views

How to encode arrays for solidity function calls

solidity arrays struct encoding abiencoderv2

modified Dec 28 '20 at 6:32 Mad Jackal 548

1

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1

answer

39

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How to check if a pending transaction nonce has duplicate?

web3js etherscan

answered Jan 5 at 10:40 Mikko Ohtamaa 12k

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