> ## Documentation Index
> Fetch the complete documentation index at: https://docs.optimism.io/llms.txt
> Use this file to discover all available pages before exploring further.

# Included contracts

> Learn about the Supersim included contracts.

The `supersim` chain environment includes contracts already deployed to help replicate the OP Stack interop environment. See [OP Chain A](./chain-a) for contract address examples for a L2 system.

## OP Stack system contracts (L1)

These are the L1 contracts that are required for a rollup as part of the OP Stack protocol. Examples are the [OptimismPortal](https://github.com/ethereum-optimism/optimism-legacy/blob/8205f678b7b4ac4625c2afe351b9c82ffaa2e795/packages/contracts-bedrock/contracts/L1/OptimismPortal.sol), [L1StandardBridge](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L1/L1StandardBridge.sol), and [L1CrossDomainMessenger](https://github.com/ethereum-optimism/optimism/blob/develop/packages/contracts-bedrock/src/L1/L1CrossDomainMessenger.sol).

For more details, see [example contracts](/op-mainnet/network-information/op-addresses#ethereum-mainnet) or the [source code](https://github.com/ethereum-optimism/optimism/tree/develop/packages/contracts-bedrock/src/L1).

## OP Stack L2 contracts (L2)

The OP Stack system contracts on the L2 are included at the standard addresses by default.

* [Standard OP Stack predeploys (L2)](https://specs.optimism.io/protocol/predeploys.html)
* [Interoperability predeploys (*experimental*) (L2)](https://specs.optimism.io/interop/predeploys.html?utm_source=op-docs\&utm_medium=docs)
* [OP Stack preinstalls (L2)](https://specs.optimism.io/protocol/preinstalls.html?utm_source=op-docs\&utm_medium=docs)

## Periphery contracts (L2)

L2 chains running on `supersim` also includes some useful contracts for testing purposes that are not part of the OP Stack by default.

### L2NativeSuperchainERC20

A simple ERC20 included in Supersim for testing cross-chain token transfers. It includes permissionless minting for easy testing.

Source: [L2NativeSuperchainERC20.sol](https://github.com/ethereum-optimism/supersim/blob/main/contracts/src/L2NativeSuperchainERC20.sol)

Deployed address: `0x420beeF000000000000000000000000000000001`

#### Minting new tokens

```bash theme={null}
cast send 0x420beeF000000000000000000000000000000001 "mint(address _to, uint256 _amount)" $RECIPIENT_ADDRESS 1ether  --rpc-url $L2_RPC_URL
```

## Next steps

* Get network details about the two OP Stack systems spun up in vanilla mode: [OPChainA (chainID 901)](/app-developers/reference/tools/supersim/chain-a) and [OPChainB (chainID 902)](/app-developers/reference/tools/supersim/chain-b).
* Learn how to [deposit transactions](/app-developers/tutorials/bridging/deposit-transactions) with Supersim, using a much simpler approach that bypasses the derivation pipeline.