> For the complete documentation index, see [llms.txt](https://docs.rei.network/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.rei.network/developer/system-contracts.md).

# System Contracts

### Public Modules

| Contract Name                                               | Description                                                                      | Address                                      |
| ----------------------------------------------------------- | -------------------------------------------------------------------------------- | -------------------------------------------- |
| [StakeManager](/developer/system-contracts/stakemanager.md) | A smart contract used for node election                                          | `0x0000000000000000000000000000000000001001` |
| [Fee](/developer/system-contracts/fee.md)                   | A smart contract that accepts native token(REI) deposit and calculates user fees | `0x0000000000000000000000000000000000001005` |
| [ContractFee](/developer/system-contracts/contractfee.md)   | A smart contract for registering contract creators and setting contract fee      | `0x000000000000000000000000000000000000100b` |

### Private Modules

| Contract Name                                                             | Description                                                                                                    | Address                                      |
| ------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------- | -------------------------------------------- |
| [Config](/developer/system-contracts/config.md)                           | Global config contract                                                                                         | `0x0000000000000000000000000000000000001000` |
| [UnstakePool](/developer/system-contracts/unstakepool.md)                 | Un-stake asset pool                                                                                            | `0x0000000000000000000000000000000000001001` |
| [ValidatorRewardPool](/developer/system-contracts/validatorrewardpool.md) | A smart contract that keeps validator reward for validator                                                     | `0x0000000000000000000000000000000000001004` |
| [CommmissionShare](/developer/system-contracts/commissionshare.md)        | A smart contract that keeps commission reward for all staking user, dynamically deployed for each validator    | -                                            |
| [FreeFee](/developer/system-contracts/freefee.md)                         | A smart contract that calculates user daily free fees                                                          | `0x0000000000000000000000000000000000001006` |
| [FeePool](/developer/system-contracts/feepool.md)                         | A smart contract that assigns REI rewards to miners according to miner shares every 24 hours                   | `0x0000000000000000000000000000000000001007` |
| [Router](/developer/system-contracts/router.md)                           | A router smart contract, the blockchain system will only interact with router contract                         | `0x0000000000000000000000000000000000001008` |
| [FeeToken](/developer/system-contracts/feetoken.md)                       | An ERC20 smart contract, only provides `balanceOf` method for users to query the fee(Stake to own) balance     | `0x0000000000000000000000000000000000001009` |
| [FreeFeeToken](/developer/system-contracts/freefeetoken.md)               | An ERC20 smart contract, only provides `balanceOf` method for users to query the free fee(Free to own) balance | `0x000000000000000000000000000000000000100a` |

{% hint style="info" %}
The blockchain system will only send transaction to **Router** contract
{% endhint %}


---

# Agent Instructions
This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com.

## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.rei.network/developer/system-contracts.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.