# Supersim

**Canonical:** https://apis.io/apis/optimism/supersim/  
**Provider:** Optimism — https://apis.io/providers/optimism/  
**Base URL:** https://github.com/ethereum-optimism/supersim  
**Documentation:** https://docs.optimism.io/stack/interop/tools/supersim

Supersim is one of 10 APIs that [Optimism](https://apis.io/providers/optimism/) publishes on the [APIs.io](https://apis.io/) network. Tagged areas include Super SIM, Interop, and Local Dev.

Local Superchain simulator that spins up multiple OP Stack chains for developing and testing cross-chain interop messages (CrossL2Inbox / L2ToL2CrossDomainMessenger) before mainnet rollout.

## Machine-readable artifacts (1)

- **Repository** — https://github.com/ethereum-optimism/supersim

## Other Optimism APIs (9)

- [OP Mainnet JSON-RPC](https://apis.io/apis/optimism/mainnet-rpc/)
- [OP Sepolia JSON-RPC](https://apis.io/apis/optimism/sepolia-rpc/)
- [Optimism Bridge (Standard Bridge)](https://apis.io/apis/optimism/bridge/)
- [OP Stack](https://apis.io/apis/optimism/op-stack/)
- [Superchain Registry](https://apis.io/apis/optimism/superchain-registry/)
- [Optimism SDK (Viem extension)](https://apis.io/apis/optimism/viem-sdk/)
- [Optimism Etherscan](https://apis.io/apis/optimism/etherscan-explorer/)
- [Optimism Blockscout](https://apis.io/apis/optimism/blockscout-explorer/)
- [Optimism JSON-RPC API](https://apis.io/apis/optimism/optimism-json-rpc-api/)

## Tags

Super SIM, Interop, Local Dev

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Profiled by [API Evangelist](https://apievangelist.com) and published on [APIs.io](https://apis.io/apis/optimism/supersim/). The API's provider profile, Kin Score and agent-readiness rating are at https://apis.io/providers/optimism/.