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Interop is currently in active development and not yet ready for production use. The information provided here may change. Check back regularly for the most up-to-date information.
Supersim is a local development environment tool designed to simulate the Optimism Superchain for developers building multi-chain applications. It provides a simplified way to test and develop applications that interact with multiple chains within the Superchain ecosystem.

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Supersim workflow

This diagram illustrates the typical workflow for developers using Supersim, from writing smart contracts to testing and refining cross-chain interactions.

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Features and benefits

  • Simulates multiple OP Stack chains locally (e.g., chain 901, 902)
  • Supports testing of cross-chain messaging and interactions
  • Includes pre-deployed interoperability contracts
  • Offers a CLI interface for starting and managing Supersim instances
  • Provides local JSON-RPC endpoints for each simulated chain
  • Allows for custom configuration of chain parameters
  • Facilitates testing of Superchain-specific features like SuperchainERC20 tokens
  • Easy to use with common Ethereum development tools
  • Supports chain forking

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Supersim CLI interaction

This diagram illustrates how developers interact with Supersim through the CLI, which simulates OP Stack-specific features (specifically interop) on locally run chains, each with its own JSON-RPC endpoint and pre-deployed interoperability contracts.

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Next steps