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.

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1 answer
250 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 ...
10 votes
4 answers
28k views

Where can I find test-ether for the Kovan Test Network?

I have tried getting some using my github account but my account got flagged immediately and the program wasn't recognizing my account (Since it wasn't public due to being flagged). Are there any ...
2 votes
2 answers
468 views

How to connect these **Remix - kovan - parity**?

I have been trying to connect deploy a smart contract from remix onto kovan chain via parity but kept on showing even after trying with all the rpc flags. if possible please throughly explain the ...
0 votes
0 answers
67 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': '...
1 vote
1 answer
27 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 ...
3 votes
1 answer
565 views

Contract transaction couldn't be found after 50 blocks in Kovan

When deploying contracts on the ledger I faced with issue Error encountered, bailing. Network state unknown. Review successful transactions manually. Error: Contract transaction couldn't be ...
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 ...
0 votes
1 answer
25 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 ...
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&...
0 votes
1 answer
76 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 ...
1 vote
2 answers
1k views

How to connect from Remix to Kovan testnet?

In Remix, there is a Contracts tab, where I can choose the "Execution environment". When I choose "Web3 Provider", I am asked to provide the "Web3 provider endpoint". What should I write there in ...
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 ...
0 votes
2 answers
40 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/...
0 votes
2 answers
200 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 ...
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". ...
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 ...
1 vote
1 answer
544 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 ...
1 vote
1 answer
437 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 --...
1 vote
2 answers
213 views

OpenZeppelin contract not working on Kovan testnet

I created a simple smart contract using OpenZeppelin and deployed the contract to the Kovan testnet. However, when I send KEth to the contract using MetaMask, nothing happens (I believe the buyTokens ...
3 votes
3 answers
680 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 ...
0 votes
1 answer
371 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.
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/...
1 vote
1 answer
220 views

List of Token Exchanges Available on Testing Network?

Found Kyber Network Token Exchange on Ropsten so far. Please share if you know more token exchanges available on any testing network for trading Tokens as a test.
0 votes
3 answers
218 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 ...
0 votes
0 answers
43 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 ...
2 votes
4 answers
2k views

truffle migrate --network kovan issue

When I run truffle migrate --network kovan in the terminal the contract deployment doesn't run. Just: Compiling your contracts...==================== >Eveything is up to date, there is nothing to ...
0 votes
1 answer
240 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....
7 votes
1 answer
758 views

Parity Error: Account not found for the current chain (Kovan)

I am having problem starting Parity with a account that I created using Metamask. This account 0x76Eb17471A5fb78EF6768254D1dAEc528ec6b5a8 has received multiple ETH from Kovan faucets. Running the ...
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 ...
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 ...
0 votes
0 answers
127 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 ...
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 ...
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 ...
0 votes
0 answers
340 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') ...
0 votes
0 answers
43 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....
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 ...
1 vote
1 answer
165 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 ...
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: ...
0 votes
0 answers
38 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 ...
8 votes
3 answers
8k views

Ethereum Testnet mobile app wallet

Is there any Mobile Wallet like Jaxx, but with testnet(like, kovan, ropsten)? Please do suggest me, I am workin on the cryto coin transfer application.
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 ...
0 votes
1 answer
821 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/...
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 ...
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 ...
0 votes
0 answers
181 views

How do I get multiple signers for the Kovan testnet?

I am using hardhat + ethers + infura for my contract development and testing, and all has been fine so far. On my local computer, when I run const [deployer, d2] = await ethers.getSigners(); in my ...
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/...
0 votes
0 answers
272 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(...
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 ...
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 ...
0 votes
1 answer
501 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 ...