Questions tagged [testnets]

testnets are an alternative blockchains to be used for testing and development with no value attached

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Best ethereum testnet to deploy smart contracts for IoTs

I want to run a local private Ethereum blockchain on Pis for: To deploy smart contracts To be able to read and control IoT Need advice in: Which testnet is most suitable for this Will it work on ...
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Is A New Instance of an Already Verified Contract Considered Already Verified

While testing some deployment and verification scripts, we deployed a smart contract and verified it on testnet etherscan. Then redeployed the smart contract again and tried to verify the new contract ...
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Transaction Data not encoding correctly

I'm trying to create an ERC20Transfer function using web3 js, which shows a successful transaction is being sent, but it's not an ERC20 transfer as I am trying to complete. code is as follows: let ...
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Sending multiple transactions in a block using Hardhat test network

Hardhat's test network, defaultNetwork: "hardhat" in config, automatically mines a block every time a transaction is sent by default. This is problematic for situations where I want to test ...
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Is there a way to mock ExternalProvider with testnet RPC link?

I'm making simple swap service and I would like to write unit tests for my swapping class. I would like to know if there is a way to mock ExternalProvider so to use real testnet url and real wallet. I'...
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No access to "Write Contract" functions after verification

So, I have the following (I've removed imports and license for readability): contract PreSale is Ownable{ address coinContract = 0x0012334567890; event TransferSent(address from, address to, ...
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How to send 3 transactions to 3 different testnets in brownie

I'm trying send 3 transactions on python (using brownie as api) to 3 different testnets (kovan, rinkeby and goerli), and i'm doing this using 3 differents threads. I have already import inside of ...
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Which Ethereum testnet will be supported after the merge (Paris/Bellatrix)?

The Ethereum execution layer (EVM) will be merged with the Ethereum consensus layer (beacon chain) in an event, called "The Merge." The code name for the merge will be Paris hardfork on the ...
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Is it possible to send testnet eth from one testnet network to another?

Is it possible to send testnet eth from one testnet network to another? Curious because ain't getting much testnet eth these days.
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Trouble deploying an ERC20 contract remix

Hi so some assistance would be greatly appreciated. I am able to successfully deploy my contract when my ether is set to 0. It will go through MM and everything looks solid. By the way I am using test ...
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Rinkeby offline [duplicate]

I’m newbie in using Rinkeby authenticated faucet. When I opened the site I discover that there is and indication saying OFFLINE. Is there anything that I’m not doing right. Please I need help.
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Creating an efficient development enviroment + workflow for dApp development

What I want to do is create an efficient workflow for rapidly developing, and testing dapps on different chains LOCALLY. I thought about using Remix IDE, with testing environments for each respective ...
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Gas estimation failed: 'invalid opcode: INVALID'. This transaction will likely revert. If you wish to broadcast, you must set the gas limit manually

I'm following the solidity course on youtube by patrick collins and i'm stuck with an issue i've described below, the deploy_and_create.py script was executed to be deployed to rinkeby network and i'm ...
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How to deploy ERC721OrdersFeature (0x v4) for trade ERC20 - ERC721 on testnet

I want to integrate with 0x-protocol v4 for trading ERC20 Token <-> ERC721 Token, I think ERC721OrdersFeature can help, how to deploy ERC721OrdersFeature smartcontract to BSC testnet?
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How to get TEST USDC on Avalanche FUJI Testnet

I'm trying to work with FUJI Testnet and I need USDC for my testing. How can I get test USDC on my wallet address on FUJI Testnet (Avalanche Testnet). For my TEST AVAX needs, I run to https://faucet....
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can i send my testnet ethers to external testnet account?

I am rich now. I installed geth on ubuntu, created a testnet chain, made an ethereum account, mined 100 ethers, and tried sending 20 ethers to another testnet ethereum account. It seems I am learning ...
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Alchemy Mumbai endpoint not working from truffle

I am trying to deploy some smart contracts on Mumbai network from truffle using an Alchemy endpoint I just created. this is my truffle-config.js But I am getting errors all the time : Not to long ...
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What bugs are revealed by testing in a multi-node environment vs a single node environment?

It's recommended practice to generally deploy to a public testnet before deploying to mainnet. I am confident in my unit tests (that are running against ganache). a. Is there a benefit to testing my ...
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Mint nft on Testnet

If we can use testnets while verifying your wallet address with smart contract, e.g. Rinkeby Robsten vs. can we use testnet to confirmed opensea account?
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Arbitrage bot couldn't be deployed on testnets

I am currently working on a Crypto arbitrage bot. It's V1.0 finds arbitrage opportunities on UniswapV2 and Kyber Swap. The challenge I am facing is testing this bot, as I just discovered there is zero ...
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Mint nft on Rinkeby testnet, and can't see it on testnet opensea

Yesterday I deployed this contract: 0x561110d50B4625DE6d5Fa14E0c35608555E934cc on rinkeby testnet I mint 4 nft on this account: 0x749C89F7F6054C8CD4a982c93E3E05e996BD5C19 And everything was ok because ...
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Does looksrare scan rinkeby - testnet?

It is known that NFT collections located on the rinkeby testnet appear automatically on testnets.opensea.io. Do NFT collections located on the rinkeby network also appear in lookshare.org? If not, how ...
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Opera browser test networks

I just downloaded the Opera Browser to test my Dapp using a wallet other than metamask. The problem I have is that I deployed my contracts on Rinkeby, Mumbai (Polygon) and Kovan but Opera only test ...
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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 ...
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Can you use Polygon Mumbai Testnet in production?

I am currently working on a Dapp that only needs to utilise the blockchain as an immutable database to sign transactions to confirm its the correct person/wallet performing an action. Would it be ...
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Sign transaction with web3js not working properly

I'm trying to call a smart contract function on a transaction on CELO alfajores network with private keys. I'm using the signing transaction approach with a locked account. However, the transaction it'...
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Failing to get test ETH from any services

I'm trying to learn solidity and I'm following a tutorial from youtube : https://www.youtube.com/watch?v=M576WGiDBdQ ||| But I can't get test ETH from Rinkeby and it gives me an error : ...
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Trouble with testnet rpc urls

I did my homework not so long ago, and when i went to settings/networks, ropsten had testnet rpc url looking like https://ropsten.infura.io/v3/somethingelse, but now it's just https://ropsten.infura....
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How can I get USDT/USDC fro Polygon Mumbai Testnet?

I am working on DeFi application on Polygon (Mumbai Testnet), and want to integrate stable coin like USDT or USDC. I have looked into the faucet of USDT and USDC, and found none of them on POLYGON ...
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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/...
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Buying specific token on Binance testnet using python

I have written a script that works fine on bsc main network but when I am trying to buy the same on the testnet I get an error of transaction underpriced. from web3 import Web3 snipeBNBAmount = 0....
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Rinkeby faucet not working. Please help [duplicate]

Trying to send some test ETH to wallet but Rinkeby faucet not working. It says insufficient funds for gas * price + value. Looks like the queue is backed up for 2 days also. Is there a solution for ...
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Read contract suddenly not working on testnet explorer

I have a contract I deployed last week. I was able to verify the contract on BSCScan Testnet explorer and successfully use the balanceOf() view function to return an address' balance. However today, I ...
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How to get Görli test ETH? [duplicate]

I want to do some "buy tests" on OpenSea testnet, and it turns out that I need some ETH on the "mumbai" testnet of Polygon!! The official Polygon Faucet doesn't provide testnet ETH,...
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Get a large amount of Test ETH on rinkeby [duplicate]

Is there an easy way to get a large amount of test ETH on rinkeby. Most of the faucets I found are either broken or send like max 0.1/24h. Yes I know I can test with smaller amounts and prices. Yes ...
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Tether testnet deployed contract addresses

Does anyone know if Tether has deployed contracts on an ethereum testnet or a level 2 testnet (Mumbai / Polygon, ...) for their stablecoins (USDT, EURT, CNHT and XAUT)? If so where could I find the ...
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Confirmation time for a smart contract on Rinkeby testnet

I have created a smart contract on Rinkeby testnet and been assigned a block. That block is over 5 hours away from being added. Is this time delay normal? If so, which other testnets that you can ...
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Using test accounts on testnets

I am trying to better understand how testing with test accounts should work. I have my contract and app working locally. I've setup truffle to now connect to ropsten network (via Infura). In that ...
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Send Signed Transaction with Private key

I deployed Test Token(Copy of LQRD) on Fantom test network. I sent signed transaction From A account To B account using A private key. The transaction was succeeded. But token was not transfered from ...
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Receiving "raise_solidity_error_on_revert" on BSC Testnet and PCS

I'm trying to test my sniper bot, therefore I want to run some operations on the bsc test net, interacting with pancakeswap. So, I first setup the correct addresses (at least in my opinion) from web3 ...
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Hardhat test, await not resolving in time

I have been trying to add to write my own basic tests for a chainlink oracle response. I am adding these tests to Ampleforth's test folder. However, the tests I am running are for the moment very ...
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Error: network does not support ENS

I am currently trying to build an NFT Marketplace and trying to establish a connection with alchemy-mumbai using JsonRpcProvider. I keep getting this error and can't figure out what i need to do: ...
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How to access mainnet data on Rinkeby?

I am writing a smart contract that uses the CryptoPunks data smart contract. This contract has a public read function punkImageSvg() that returns a string with the SVG of the punk in question. The ...
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Call to my contract failed on Mumbai network with "Fail with error 'Disabled feature'"

Here is the call, this should simply add a struct to an array like: buyOrdersBook.push( Order(priceToBuyFor, amountToObtain) );, but seems to have failed quickly: https://mumbai.polygonscan.com/tx/...
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BSC-Testnet Contract verification Fails: Error! Unable to generate Contract ByteCode and ABI

I've been struggling with this with different methods. As the most straightforward, I tried manually-flattening the code in REMIX, and verifying it on bscscan. Compiler version OK, Runs for ...
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Is there a benefit to using one testnet over another?

We have been using rinkeby, but the faucet is often offline. Is there any reason to use rinkeby over goerli or another one?
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Using payable functions in the remix ide

I created a simple solidity contract in the remix ide. I cannot figure out how to test the payable functions I created. here is an example of a payable function: function pay() payable { } here is a ...
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Testnet, "error: out of gas" when calling other contract's function within contract

so i tried to use address.call(abi.encodeWithSignature("function()")) in my caller contract to call the callee contract's function. It seems every time i deployed it into testnet and then i ...
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How can I advance time when testing on Rinkeby network?

I've successfully deployed my contract to Rinkeby. Testing on Remix everything worked fine. I'm now writing some tests in Javascript but I don't know how to advance time to test functions in a ...
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I get "There was a problem processing your request" when buying or accepting an offer on OpenSea

I made my own collection of NFTs on OpenSea and I'm trying to buy or accept offers. The network I'm using it Polygon (Mumbai). The problem is, that there's no way, or at least I couldn't find a way, ...
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