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What is a testnet? A testnet faucet provides web3 developers with free tokens for deploying, testing, and optimizing smart contracts on test blockchains such as Sepolia, Goerli, and Mumbai. Because smart contracts on public, mainnet blockchains like Ethereum and Polygon require gas fees to run smart contracts, testnets provide blockchain developers with a network that mirrors production blockchain environments without requiring gas fees that cost real money. Get Testnet Tokens! blockchain automation testing sui wave 3 testnet4 eth test explorer test drive unlimited game goerli linea bridge ether sepolia scan ethereum smart contract testing osmosis testnet mintscan