Testnets and Faucets

Testnets mirror mainnet behavior without real money. Deploy contracts, break things, and iterate before risking user funds. Ethereum's primary dApp testnet is Sepolia; Holesky serves staking and infrastructure testing.

Configure deploy scripts and your frontend to target the same testnet RPC. Verify contracts on Sepolia Etherscan separately from mainnet — users and auditors rely on verified source to read what your contracts actually do.

Some integrations — fiat on-ramps, certain price oracles — only exist on mainnet. Treat testnet success as necessary but not sufficient; staging with a mainnet state fork catches integration bugs that testnet alone will miss.