Beginner

What Is a Testnet?

By DappAtlas editors ·

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A testnet is a public blockchain network that works like a main network but uses tokens with no monetary value, so developers and users can test apps and transactions without risking real funds.

Key takeaways

  • Testnet tokens have no value and cannot be sold.
  • You get them for free from a faucet.
  • Sepolia and Hoodi are Ethereum’s current public testnets.
  • Each testnet has its own chain ID, different from its mainnet.

How a testnet works

A testnet runs the same software as the main network, with its own validators and chain ID. Because the tokens are free, anyone can experiment.[1]

Common testnets

Sepolia is the main testnet for app developers on Ethereum; Hoodi is used for validator and staking tests. L2s run their own, such as Base Sepolia and Arbitrum Sepolia.[1]

Risks and scams

Scammers sell “testnet tokens” or promise that they will turn into real coins. Testnet tokens have no value; never pay for them.

The Bottom Line

A testnet is a safe place to practice. Get tokens from a faucet, not from a seller.

Educational content, not financial advice.

FaucetA site that gives out free testnet tokens.Chain IDThe number that identifies an EVM network.RPC endpointThe URL a wallet or app uses to talk to a blockchain node.
Pros
  • Test transactions and contracts without real money
Cons
  • Testnets are reset or retired over time
  • Faucets limit how many tokens you can get
Sources (1)
  1. [1] ethereum.org. “Networks.” Accessed Sep 26, 2026.
DevelopersBasics

Testnet FAQ

Can I sell testnet tokens?

No. They have no monetary value, and anyone offering to buy or sell them is likely running a scam.

Which Ethereum testnet should I use?

Sepolia for apps and smart contracts; Hoodi for validator and staking testing.

How this page works

Sources: ethereum.org. Data as of Sep 26, 2026.

How we review

Not affiliated with any project listed. Educational content, not financial advice.