Testnets: Getting Involved Early Without Risk
Testnets, faucets, worthless test tokens, fake "testnet token sales": how to try a project early without exposing your funds or counting on a guaranteed airdrop.
The essentials
What is a testnet?
A "production" blockchain, the one where real assets circulate, is called the mainnet. A testnet (test network) runs the same software or nearly so, but its tokens are worth nothing. The ethereum.org documentation compares the relationship between the two to that between a production server and a staging server: you test contracts and applications in near-real conditions before deploying them for good.
On Ethereum, for example, ethereum.org currently recommends:
- Sepolia for application developers;
- Hoodi for testing staking and protocol upgrades on the validator side;
- the former Holesky testnet has been deprecated since September 2025.
Many other projects (layer 2s, new blockchains, DeFi applications) also launch their own testnet before their mainnet. This is often where the general public can try them for the first time.
Why projects open their testnet to the public
A public testnet is used to:
- find bugs before real money is at stake;
- measure the load the network can handle;
- test the application's usability with real users;
- build an initial community.
To draw people in, some projects run "campaigns" (quests, tasks, leaderboards). Sometimes, participants later received an airdrop, meaning a free distribution of tokens. But this is never automatic, as we explain below.
Faucets: getting test tokens
To make a transaction on a testnet, you have to pay fees, in test tokens. You get them from a faucet: a website where you enter an address and which sends you a small amount of test tokens for free. ethereum.org lists several faucets for Sepolia and Hoodi, and the MetaMask team, for example, offers a faucet for Sepolia and Linea Sepolia.
A few practical points:
- faucets often impose limits to prevent abuse; these conditions vary from one faucet to another and change regularly;
- a faucet must never ask for your recovery phrase (seed phrase) or for an authorization signature on your real assets;
- preferably use the links given in the project's official documentation or on ethereum.org, rather than a link found in an ad or a private message.
ethereum.org notes a paradox: test tokens are supposed to have no value, but some have become scarce and hard to obtain, which has led to parallel markets. That doesn't give them any "official" value, and it is precisely fertile ground for scams.
Test tokens have no value
This is the most important rule in this guide. The MetaMask help center states it unambiguously: testnet funds have no real value, and anyone claiming otherwise may be scamming you. BitPay, for its part, reminds users that testnet and mainnet are incompatible blockchains: tokens can't move from one to the other.
In practice:
- you can't "convert" test tokens into real ETH or euros;
- a testnet balance displayed with a dollar or euro value in a wallet proves nothing (some wallets even let you turn on a conversion display on testnets);
- a serious project will never sell you test tokens.
Classic testnet scams
The fake test-token payment. According to MetaMask, the scammer offers to swap test tokens for something of value (an NFT, an item, a game asset), convinces you they're worth something, then takes your property. Since transactions are irreversible, it is almost impossible to undo.
The wallet "set up" by someone else. BitPay describes fraudsters who create a wallet for the victim, send large amounts of test tokens to it to give the illusion of wealth, then ask them to buy real crypto in order to "unlock" or "withdraw" those funds. Never let someone create a wallet for you.
The fake "testnet token sale." On social media, you may see presale offers for "testnet tokens" or "testnet points" before the official launch. A test token gives no right to a future token, and no team sells access to its testnet. If you're asked to pay in real crypto to take part in a testnet, it's a major red flag.
The fake testnet website. A clone of the project's site asks you to connect your main wallet and sign a transaction that, in reality, authorizes a malicious contract to drain your real assets. Our guide on phishing and drainers explains this mechanism in detail.
The warning signs cited by MetaMask apply perfectly here: urgency ("only 2 hours left"), unsolicited messages, and offers that are too good to be true.
Use a separate wallet
Even though test tokens are worthless, your wallet may hold real assets on mainnet. And the same address exists on all EVM-compatible networks: a malicious signature made "on the testnet" can target your real funds if the site is booby-trapped.
Best practice:
- create a wallet dedicated to testnets and experiments, with its own recovery phrase;
- don't keep valuable mainnet assets in it, or only the bare minimum if a project requires a little real activity;
- keep your savings in a separate wallet, ideally a hardware one, that you never connect to test sites;
- write down this test wallet's seed phrase offline, like any other: if a project rewards that address one day, you'll want to be able to access it.
In MetaMask, testnets are hidden by default. According to the help center, you need to open the "Networks" menu and turn on the "Show test networks" option at the bottom of the list; you can also add a custom network. Other wallets have equivalent settings.
Which actions do projects appreciate?
There is no universal public rule, and each team decides its own criteria. But since the goal of a testnet is to test, the contributions most useful to the project are generally the ones that really help it:
- using the real features: sending, swapping, depositing, withdrawing, trying edge cases;
- reporting bugs clearly, through the intended channel (form, GitHub, official Discord), with the steps to reproduce the problem;
- giving feedback on usability or documentation;
- taking part over time rather than doing every task in an hour and vanishing;
- for technical profiles: running a test node or validator, deploying a contract, contributing code.
Conversely, multiplying addresses to artificially inflate your activity is often detected and penalized (this is called "Sybil" behavior). We have a dedicated guide on it.
No guarantee of a reward
Let's be clear: taking part in a testnet gives you no right to an airdrop. Many testnets never led to any distribution at all, and when there is one, the criteria are often announced after the fact. The right mindset: treat the testnet as a free way to learn and discover a project, and any eventual reward as a bonus.
This guide is general information and does not constitute investment advice.
A concrete example
Claire wants to try a new DeFi application that is announcing its testnet on Sepolia.
- She finds the testnet link from the project's official website and official X account, and checks that they point to the same domain.
- She creates a new wallet, separate from the one holding her real ETH, and writes the recovery phrase down on paper.
- She turns on the display of test networks in her wallet and selects Sepolia.
- She requests test tokens from a faucet listed in the project's documentation or on ethereum.org.
- She tests the application for several weeks: deposit, withdrawal, swap. On the official channel, she reports a button that doesn't work on mobile.
- On Telegram, a stranger offers to sell her "testnet tokens" ahead of the official listing. She ignores the message: a test token can't be bought.
Result: Claire discovered the project, exposed no real assets, and depends on no promise.
Mistakes to avoid
- Paying for test tokens or for "access" to a testnet: they are free via faucets and worthless.
- Connecting your main wallet to a testnet site, especially if it asks for an unusual signature.
- Letting someone create or "configure" a wallet for you.
- Believing a balance displayed in dollars on a testnet is real.
- Giving your seed phrase to "support" who contacts you privately to "validate your participation."
- Multiplying accounts to improve your chances: this can get you excluded from everything.
- Counting on an airdrop to justify time or money invested: it may never come.
Key takeaways
- A testnet is a trial version of a blockchain: you test with free tokens obtained through faucets.
- Test tokens have no value and can't be converted into real crypto; any offer to sell or buy them is suspect.
- Use a wallet dedicated to testnets, separate from the one holding your real assets.
- Useful contributions (real use, bug reports, feedback, consistency) are worth more than racing through tasks.
- Taking part in a testnet guarantees no reward: see it first as a way to learn.