Starknet Sepolia is the primarytestnet environment for Starknet, built to closely replicate the behavior of the Starknet Mainnet. It is connected to theEthereum Sepolia testnet, enabling developers to test cross-layer interactions and smart contracts in a realistic, low-risk setting.

This environment is ideal for:

• Debugging and refining Cairo-based smart contracts

• Testing dApp functionality under near-mainnet conditions

• Validating Ethereum–Starknet interactions using Sepolia ETH

Starknet Sepolia offers developers a reliable staging ground before deploying to Mainnet.