Questions tagged [kovan]

Kovan is a new testnet for Ethereum using Parity's Proof of Authority consensus engine, which is immune to spam attacks as Ether supply is controlled by trusted parties and provides a consistent 4 second block time.

Filter by
Sorted by
Tagged with
1 vote
1 answer
30 views

How can I call a deployed smart contract on Kovan using Python?

The smart contract was written and deployed on Kovan using Remix IDE and injected Metamask Kovan test network account. However, I'll need python to deal with large input of a function in the smart ...
user avatar
0 votes
1 answer
26 views

contract has not been deployed to detected network (network/artifact mismatch) when use truffle console --network kovan

i'm trying to call a function from contract that i deployed to kovan network, then when i used the truffle console --network kovan and tried to deploy my contract, it says that this contract has not ...
user avatar
0 votes
0 answers
72 views

How to get detailed error for ValueError: {'code': -32016, 'data': 'Reverted', 'message': 'The execution failed due to an exception.'}

I deployed my Fund_me smart contract on Kovan testnet and I tried to call the withdraw function on it using web3, but I'm getting the error ValueError: {'code': -32016, 'data': 'Reverted', 'message': '...
user avatar
  • 101
0 votes
1 answer
88 views

Can't get Kovan testnet from Faucets.chain.link

I'm trying to get the ETH -> USD price from ChainLink but it's code requires the Kaven testnet. But the problem is that the https://faucets.chain.link website isn't working correctly and it sends ...
user avatar
0 votes
2 answers
45 views

Error: This contract may be abstract, not implement an abstract parent's methods completely, not invoke an inherited contract's constructor correctly

Injected web3 Kovan 42 network Remix IDE This is from the freecodecamp.org tutorial on youtube Here is the code : // SPDX-License-Identifier: MIT pragma solidity ^0.8.7; import "@chainlink/...
user avatar
0 votes
1 answer
50 views

Kovan Test Net: not receiving test LINK

I tried to receive Link on the Kovan testnet two different ways, with the same result- No error message, it just continues to load endlessly. https://kovan.chain.link/. a) "Send me 100 test link&...
user avatar
0 votes
0 answers
55 views

problems deploying a contract on the Kovan network

Good evening, a couple of days ago I was able to execute this command without any problem and today, suddenly, I got this error. I don't understand what it means by "insufficient funds". ...
user avatar
  • 141
0 votes
0 answers
46 views

How to query Uniswap API to get cryptocurrency pair price on ethereum kovan network returns call revert exception error

I am currently trying to request a currency pair price from two tokens published on Uniswap at: https://app.uniswap.org/#/pool/10341?chain=kovan. Following a tutorial, I managed to successfully ...
user avatar
0 votes
1 answer
403 views

Can I exchange test kovan eth to main eth? [duplicate]

I have some test eth. But I don't know how to use them. Can transfer as real eth Or what I have to do that please help me. Or I can sold them. In that case at how much cost can I sold.
user avatar
  • 1
0 votes
0 answers
48 views

How do I listen to changes for an ethereum address using websockets + RPC eth_subscribe method + postman

I am trying to listen for changes in a wallet balance on the Kovan testnet , so I have connected to a Kovan node using a node provider's websocket endpoint, I have no errors connecting, and no errors ...
user avatar
0 votes
3 answers
226 views

Kovan Chainlink Faucet - Unable to locate the transaction hash

Etherscan says "Sorry, We are unable to locate this TxnHash" when sending LINK using both https://kovan.chain.link/ and https://faucets.chain.link/kovan Waiting for a long time already but ...
user avatar
0 votes
0 answers
131 views

ProviderError: Transaction with the same hash was already imported

I'm deploying upgradeable contracts on Kovan, but every time I run my deploy script I get the error. I'm using Hardhat. My deployment script const fs = require('fs') async function main() { let ...
user avatar
0 votes
2 answers
210 views

Error: Private key does not satisfy the curve requirements (ie. it is invalid)

I have a project working fine on truffle but when migrating to Kovan network, Getting the issue "Error: Private key does not satisfy the curve requirements (ie. it is invalid)" project is an ...
user avatar
1 vote
1 answer
255 views

Troubles interacting with Chainlink node on Kovan

I've been following instructions on running a local Chainlink node on Kovan. My environment is configured to Kovan through websockets via Infura and the node is both running and successfully accepts ...
user avatar
  • 65
1 vote
1 answer
3k views

Where to find and how to get Kovan USDC testnet tokens

I need USDC Kovan testnet tokens transffered to this address 0x2E9b971e336C825BC41b9FE87376E74f0B3345FE for testing purposes. Token contract for this token is https://kovan.etherscan.io/token/...
user avatar
  • 123
0 votes
1 answer
54 views

0x Kovan API returning 503 responses?

We have been using the Kovan 0x endpoint (https://kovan.api.0x.org/swap/v1) for a few months without trouble, but just started receiving HTTP 503 responses back today. Is the endpoint still supported ...
user avatar
  • 15
0 votes
0 answers
44 views

Kovan Network - Transaction has been reverted by the EVM

i'm relatively new to web3 and Ethereum. I'm trying to approve a contract on the Kovan network, which requires 1 DAI to make this transaction. const segmentPayment = await gameContract.methods....
user avatar
  • 1
0 votes
0 answers
346 views

How to get the contract address based on the transaction hash?

I have the following code which returns the tx hash but when I call upon the receipt it returns null and thus cannot extract the address: const privateKey1Buffer = Buffer.from(privateKey1, 'hex') ...
user avatar
0 votes
0 answers
90 views

Can't get revert reason (TransactionRevertedWithoutReason)

I'm making some tests on kovan network to execute a flash swap on uniswap. But for now I have reduce my probleme to this : // SPDX-License-Identifier: MIT pragma solidity 0.6.12; pragma experimental ...
user avatar
1 vote
1 answer
169 views

Chainlink "Any API" Returning 0

I want to use the chainlink API features but I can not get the data. When I try to execute requestEthereumPrice function I get "uint256: 0" I am using Kovan test net and metamask. pragma ...
user avatar
1 vote
1 answer
554 views

Connect local React frontend to contract on testnet (e.g Kovan)

I am new to this community and I had a question, in my opinion I think basic, but I have not found much information, see if you can help me. I have been developing smart contracts, both in Remix and ...
user avatar
0 votes
2 answers
1k views

Cannot obtain Kovan testnet Ether

Does anyone else have issues obtaining kovan ether? I have tried the following links only to recieve 0.01 Keth increments from app.mycrypto.com (when the site is up). The github sites do not respond ...
user avatar
3 votes
3 answers
692 views

I keep getting nonce is too low when using truffle to call functions on contracts even though this works fine on remix.How can I fix this

I keep getting the nonce is too low when running functions with sub transactions on the kovan test net is there a way I can stop this from happening?these sub transactions are making transactions with ...
user avatar
1 vote
1 answer
54 views

I'm connecting to the wrong network but my configuration seems right

Trying to run truffle console I got this typical error: I've checked my configuration and it seems OK to me (I don't know why truffle is trying to connect to 127.0.0.1). Here you can see my project: ...
user avatar
  • 141
0 votes
0 answers
39 views

how to access a DApp deployed on testnet (Kovan)

I'm using Infura, HDWallet and Metamask. I have a truffle project and my truffle-config.js is ready. Currently, I'm able to interact with my Smart Contract via PowerShell and via browser, so all ...
user avatar
  • 141
2 votes
1 answer
37 views

Is there a decentralized way to intercommunicate between two Ethereum networks?

If I have Contract A deployed to the Rinkeby Test Netwok If I have Contract B deployed to the Kovan Test Netwok Then, can we program the contracts to interact with each other like Contract A invoking ...
user avatar
0 votes
1 answer
822 views

Not receiving LINK from Chainlink kovan faucet

I attempted to get funds from kovan.chain.link to my metamask address and the money did not come through. I got some errors as seen here: https://kovan.etherscan.io/tx/...
user avatar
  • 15
1 vote
0 answers
155 views

Gas Estimation Error - Swap Contract

I'm working on developing a contract that automatically performs a swap and have been having an issue with the swap function. I finally got the contract deployed on Kovan, but have been getting the ...
user avatar
1 vote
0 answers
41 views

Contract method works on local but not on testnet

The following method, which works perfectly fine on my local ganache. function someMethod() external view returns ( bool someValue, uint256 lastIndex, uint256 totalTokens ...
user avatar
  • 133
1 vote
0 answers
37 views

AAVE Protocol v1 issue on reserve addresses with compound ctoken addresses

https://kovan.etherscan.io/tx/0xa7f5e857d1a9ecb4aca0714b24a70ca0942cc1a656c8e09b6d01bab9af4ec9e5 I am trying to make a transaction from DSProxy (Smart Wallet) on a contract https://kovan.etherscan.io/...
user avatar
0 votes
0 answers
278 views

Issue with `TRANSFER_FROM_FAILED` when calling Uniswap contract - but I am approving the token!

My code is pretty simple function swapForEth(address tokenAddress, uint amountIn, uint amountOutMin, address to, uint deadline) external onlyOwner payable { require(IERC20(...
user avatar
  • 103
0 votes
2 answers
139 views

Exception:Reverted when swap by smart contrat with uniswap

Here is my code pragma solidity ^0.8.2; import "https://github.com/Uniswap/uniswap-v2-periphery/blob/master/contracts/interfaces/IUniswapV2Router02.sol"; contract Test_Swap{ address ...
user avatar
2 votes
2 answers
3k views

"Invalid Chain Id" on Kovan testnet

I'm attempting to initiate a transaction (transfer of ETH) from my main account to a test account on the Kovan Testnet, but I'm getting the error Returned error: Invalid chain id. from the following ...
user avatar
0 votes
1 answer
511 views

'Transaction nonce is too low. Try incrementing the nonce.' while following truffle tutorial

I ran into a nonce error on the last leg of this tutorial : https://www.trufflesuite.com/boxes/flashloan-box I also supplemented the tutorial with this video on yt(fyi b/c some of the code comes from ...
user avatar
  • 21
0 votes
1 answer
321 views

Transaction not showing on Kovan etherscan even after its status showed transaction mined and executed successfully

I have my contract deployed on Kovan Testnet and from remix IDE I called one of the functions of my smart contract through remix itself. Now, the status of transaction shows "transaction mined ...
user avatar
1 vote
0 answers
225 views

Is kovan network died? [duplicate]

Kovan's network faucet is inactive. I have only found a few "faucets" that give me 0.01 or 0.1 test Ether every 24 hours... https://faucet.kovan.network This is the Kovan Token contract. Its ...
user avatar
  • 549
3 votes
1 answer
3k views

Cant find sushiswap router address for Kovan testnet

Can anyone get me a routerV2 address for sushiswap on Kovan? The address given on sushi page is incorrect.Thanks
user avatar
  • 41
0 votes
2 answers
275 views

Deploy contract to Kovan with brownie and infura

I'm trying to simply deploy a smart contract in Kovan network, i've used the export of the ID using export WEB3_INFURA_PROJECT_ID=xxxx but i'm getting this error ValueError: The method ...
user avatar
  • 19
0 votes
2 answers
1k views

Seamless process to obtain test ether from faucet? [duplicate]

I am unable to successfully "Buy" Ether from a faucet for Ropsten or from Kovan. Is it me or do most people have issues setting up a testnet using Ropsten and/or Kovan? Can anyone help me ...
user avatar
0 votes
1 answer
594 views

Chainlink Price feed Main contract points to Kovan. Why? [closed]

I'm setting up price feeds with Chainlink. https://docs.chain.link/docs/ethereum-addresses#mainnet This page has sections: Mainnet, Rinkeby, Kovan. Under Mainnet.. Clicking a pricefeed takes me to .. ...
user avatar
  • 553
0 votes
1 answer
174 views

ETH transactions to presale contract keep failing

I'm trying to send some ETH to a presale smart contract on Kovan. Allowance has been set with presale address as a spender - with the exact same amount as the tokens allocated in the presale contract. ...
user avatar
  • 15
0 votes
2 answers
1k views

Unable to interact with a contract on Kovan network on Remix IDE

I am working on a project and I have successfully deployed a smart contract on Kovan test network, but for some reason, I am not able to interact with it in JS code. So, now I want to access it ...
user avatar
  • 522
0 votes
0 answers
24 views

BlankToken Transaction

So i deployed my smart contract on Kovan Network using Remix IDE, i after successful compilation I added the arguments of the constructor to create the token, it deployed successfully but the issue ...
user avatar
  • 133
2 votes
1 answer
5k views

false Transaction mined but execution failed

I was trying to deploy my smart contract to Kovan test network using Remix IDE,although it compiles successfully but when I try to deploy it I get this error message "false Transaction mined but ...
user avatar
  • 133
0 votes
1 answer
241 views

Howto check sync with kovan testnet is complete or not?

I am trying to sync with Kovan testnet, docker run --name eth -p 8546:8546 -v ~/ws-002-chainlink/ws00-docker-geth-ropsten:/geth -it ethereum/client-go:stable --testnet --syncmode light --ws --wsaddr 0....
user avatar
  • 1
0 votes
1 answer
138 views

How can I obtain testnet REP for use on Kovan?

I would like to test the new version of Augur on the Kovan testnet. Where can I obtain testnet REP in order to do so? I found https://faucet.kovan.network/ for Kovan Ether (KETH) but cannot find ...
user avatar
0 votes
1 answer
89 views

How to sign a erc20 contract call with key using web3

I am making a call to the Dai contract on the Kovan testnet to facilitate transactions between any two addresses entered as input. I was able to successfully make read calls but I realized I needed to ...
user avatar
0 votes
1 answer
200 views

web3.eth.defaultChain returns undefined

Hi I am trying to make a call to the Dai contract in the Kovan testnet using web3.js and have to set the value of web3.eth.defaultChain to 'kovan'. The docs state that the default value for web3.eth....
user avatar
1 vote
1 answer
160 views

How to handle events for testnet and mainnet?

I know how to handle events using personalised blockchain using ganache, can anyone tell me how to handle events in Kovan,rinkeby testnets?
user avatar
9 votes
3 answers
7k views

Sending multiple transactions in the same block with incremented nonces

I need to send 0.1 ETH to 10 unique addresses from the same address at the same time. I am manually incrementing each transaction's nonce, and the transactions are sent successfully. However, each ...
user avatar
  • 244