Questions tagged [testnets]

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

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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 ...
em_mutable's user avatar
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1 answer
1k views

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 ...
Shiri's user avatar
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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 ...
1manonearth's user avatar
2 votes
1 answer
290 views

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.
Syed Murtaza Ali Shah's user avatar
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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 ...
Mark's user avatar
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1 answer
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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.
fedinand victor's user avatar
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1 answer
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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 ...
ikedwibwims's user avatar
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2 answers
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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 ...
Dilip H's user avatar
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1 answer
126 views

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?
Quoc-Bao Tran's user avatar
2 votes
3 answers
5k views

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....
momoja's user avatar
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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 ...
carrotcoach's user avatar
1 vote
0 answers
255 views

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 ...
Alberto Molina's user avatar
2 votes
1 answer
546 views

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?
Slavic.Qᴼˣ's user avatar
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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 ...
Valoon's user avatar
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1 answer
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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 ...
Shai Kimchi's user avatar
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2 answers
609 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 ...
Erfan Games's user avatar
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2 answers
473 views

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 ...
GotNoClout's user avatar
1 vote
1 answer
594 views

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'...
yieniggu's user avatar
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4 answers
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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 : ...
Erfan Games's user avatar
5 votes
7 answers
18k views

How can I get USDT/USDC for Polygon Mumbai Testnet?

I am working on a DeFi application on Polygon (Mumbai Testnet), and want to integrate stablecoins like USDT or USDC. I have looked for a faucet of USDT and USDC, and found none of them on POLYGON ...
Megabyte's user avatar
2 votes
2 answers
764 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/...
dustycar17's user avatar
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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....
0xcognito's user avatar
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1 answer
1k views

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 ...
blockbuoy's user avatar
1 vote
0 answers
134 views

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 ...
EKN's user avatar
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2 votes
1 answer
4k views

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,...
goodUser's user avatar
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11 views

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 ...
catmaxi's user avatar
2 votes
1 answer
906 views

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 ...
Alberto Molina's user avatar
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1 answer
143 views

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 ...
gunygoogoo's user avatar
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1 answer
1k views

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 ...
K.Araki's user avatar
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1 answer
777 views

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 ...
Btadford's user avatar
6 votes
4 answers
14k views

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: ...
jf13's user avatar
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0 votes
2 answers
165 views

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 ...
Tom's user avatar
  • 133
1 vote
1 answer
439 views

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 ...
ealco85's user avatar
  • 23
0 votes
1 answer
130 views

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?
p0pps's user avatar
  • 288
0 votes
1 answer
2k views

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 ...
Aidan Collins's user avatar
0 votes
1 answer
80 views

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 ...
Jochen Ruland's user avatar
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0 answers
3k views

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, ...
BonisTech's user avatar
  • 654
2 votes
5 answers
8k views

Any shortcuts to get some test ethers for goerli test net?

let me know if you have any other ways to get some test ethers apart form(https://faucet.goerli.mudit.blog/) tweet post, fb post link and mycrypto request.
Ashok Sandhyala's user avatar
1 vote
2 answers
2k views

Polygon Mumbai test net MATIC tokens

I am developing a Dapp and I want to test it using the Mumbai testnet but I need many matic tokens. Currently the Mumbai faucet is giving you only 1 MATIC token. Is there a way to obtain some more? ...
Hristo Todorov's user avatar
1 vote
2 answers
5k views

unable to get test eth for Goerli testnet , and it is showing this error all the time"url doesn't link to supported services"

I have tried to get it with both tweeter post and facebook post links to get eth,But they are not working for me.
Ashok Sandhyala's user avatar
1 vote
1 answer
861 views

Why am I getting "Too Many Requests" / "[ethjs-query] while formatting outputs from RPC" error from faucet.metamask.io

I am simply trying to get some test ether on Ropsten network from https://faucet.metamask.io/ and I keep getting this error. Any suggestion: Error: 500 {"error":"[ethjs-query] while ...
Ali RJ's user avatar
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0 votes
1 answer
33 views

What is the incentive for people who provide us ETH for testing?

this is not a technical question, however I was curious to know what is the incentive for people who provide us ETH for testing? Thanks
Nerdy19's user avatar
0 votes
1 answer
4k views

Why did my transaction fail? (BEP20 token in BSC)

I just created a BEP20 token in Remix and deployed it on the BSC Testnet. When I try to transfer tokens from my Metamask account, give me this message in Transaccion Data: Transaction decoding is not ...
Alejandro Piña's user avatar
0 votes
1 answer
319 views

dapp testnet - Fatal: Failed to write genesis block: database contains incompatible genesis

I got an error using dapp testnet command : Fatal: Failed to write genesis block: database contains incompatible genesis (have 36e0fd38f5fc4e17c59365b6a25c3402ed2cd4d47b634718fad38e3a7c84e65a, new ...
cyberlobster's user avatar
0 votes
1 answer
227 views

What are the Benefits of running an Ethereum Full Node if you are not mining?

As stated in the title, what is the direct or indirect benefit i stand to gain from running a full node on the Ethereum mainnet or Testnet I know Nicholas has a brilliant answer here, but it's about 5 ...
Muhammad Yasir's user avatar
2 votes
0 answers
142 views

Read from a testnet Rinkeby contract with hardhat script

I am trying to read state variables (using hardhat scripts) from a contract deployed on the Rinkeby network. I use the script below but it returns 'undefined' as if it can't read from the contract. ...
user32379's user avatar
1 vote
1 answer
2k views

Hardhat testing on testnet (Rinkeby)

I want to do some final tests on a smart contract that has been deployed on the Rinkeby testnet. I am trying to run the below script (saved in my hardhat test folder) with hardhat but get the ...
user32379's user avatar
0 votes
1 answer
1k views

Can't See NFT on OpenSea Testnet

I just deployed my contract on rinkeby and minted one nft, but I can't see the nft information on OpenSea testnet. Can somebody help me?
n3n3's user avatar
  • 608
9 votes
8 answers
33k views

cannot estimate gas; transaction may fail or may require manual gas limit

I have an ERC721 contract on rinkeby and need to test the mint function, but sometimes I receive the fallowing error: Error: cannot estimate gas; transaction may fail or may require manual gas limit .....
n3n3's user avatar
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