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1500 questions
9
votes
5 answers

insufficient funds for intrinsic transaction cost

i've codded a script using js to trigger a buy on uniswap. the way i achieved this is through importing uniswaps smart contracts using this line of code: const router = new ethers.Contract(addresses.router,['function getAmountsOut(uint amountIn,…
Aaron Klich
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3 answers

ProviderError: max code size exceeded

I am trying to deploy an upgradeable smart contract on bsc testnet using hardhat. But after running npx hardhat run --network testnet scripts/deploy.js it gives me the following error. ProviderError: max code size exceeded at…
mzaidi
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9
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2 answers

How to pass struct mappings to solidity functions?

I have two mappings (uint => customStruct) called listA and listB. I want to run both through a single function to perform operations on the contents. How do I pass this type into a function so that I can call someFunction(listA) and…
slothbag
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9
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4 answers

Truffle Migrate Rinkeby - Error: PollingBlockTracker - encountered an error while attempting to update latest block: Error: ETIMEDOUT

I am facing this error when on running truffle migrate on Rinkeby network with my infura
Sahil Kharya
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9
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3 answers

Convert an eth key to a geth key

I need to convert my eth key to a geth key. eth put the key in %appdata%\roaming\Web3\keys, and I see it as a .json file. If I move that to the %appdata%\roaming\Ethereum\keystore directory, geth still doesn't recognize it. If I try to do geth…
feebel
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9
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3 answers

Why does ERC721 have transferFrom and safeTransferFrom?

ERC721 has both safeTransferFrom and transferFrom, where safeTransferFrom throws if the receiving contract's onERC721Received method doesn't return a specific magic number. This is to ensure a receiving contract is capable of receiving the token, so…
BlakeMScurr
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3 answers

Is there a point to hide Ethereum nodes with TOR?

From a privacy perspective, is there any point in trying to torify ethereum nodes? I know there's a script to do that in bitcoin, although doing so may ironically made the bitcoin node more vulnerable to attacks. Follow up question: has anyone…
shiso
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9
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4 answers

Deployment Failed : "Migrations" -- only replay-protected (EIP-155) transactions allowed over RPC

I am trying to migrate the code which is already tested in mainnet to ropsten network. I wonder why it is throwing the below strange error. We as a team unable to find a solution for this for past 2 days. Any assistance in this regard will be very…
iappmaker
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9
votes
2 answers

Get Uniswap Exchange Rate of any Token with Web3

I need to get the exchange rate for every token on Uniswap with Web3 like Uniswap itself which they then display on their web interface on app.uniswap.org like this: So when I enter to swap the amount of tokens I want to to give (1 ETH in this…
Paulus
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9
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1 answer

RPC error "invalid or missing value for params" when calling contract constant void functions

My contract has a function defined like this: {"constant":true,"inputs":[],"name":"queryNumEscrows","outputs": [{"name":"","type":"uint256"}],"payable":false,"type":"function"} Having no inputs. Its Solidity source code is pretty simple: function…
Juan Ignacio Pérez Sacristán
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9
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2 answers

Float not allowed in solidity vs decimal places asked for token contract

We know that solidity doesn't support the float values. But here (https://www.ethereum.org/token#understanding-the-code) they accept one input parameter 'decimal places' for calculation purpose. How this action has been executed when this token is…
Aniket
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9
votes
2 answers

How to estimate the cost to call a Smart Contract method?

After succesfully deployed this Smart Contract on Ethereum testnet https://testnet.etherscan.io/address/0x27c042342C9ba937214117e11A4970A6145034cB is it possible to calculate how much gas is going to take to invoke a given method of the Smart…
Juan Ignacio Pérez Sacristán
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9
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1 answer

No signer to authorize the transaction with

When trying to make a transaction on a boundContract with geth-api through the library of @karalabe. I am missing a way to get the signer. I only see the interface for signer in the aar but no way to get a implementation of…
ligi
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9
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3 answers

Ethers.js filters events (Only new events)

I have an event set up in the Contract. Contact Packages emit Spend(msg.sender, msg); function sendPackage(msg) external payable returns(bool) { require( msg.value == price, 'Please send the correct amount of ETH to make…
GN.
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9
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1 answer

Ethereum wallet keeps redownloading entire blockchain

I'm having serious problems with my wallet. I was running fine up until a couple of weeks ago, then when opening the wallet I was asked to update. I did, and ever since I've had nothing but trouble. So firstly, I'm on Windows 10. I have 10mb…
Gary Stanton
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