# Moonwell Core

Moonwell Core is a Compound V2-compatible lending protocol deployed on Base and OP Mainnet. Developers interact with two main contracts: **mTokens** (market-level supply, borrow, repay, liquidate) and the **Comptroller** (collateral management, account health, risk parameters).

## Architecture

```
┌──────────────────────────────────────────────────────┐
│                    Comptroller                        │
│  Policy layer - collateral, health checks, rewards   │
└──────────┬────────────────────────────┬──────────────┘
           │                            │
     ┌─────▼──────┐             ┌──────▼───────┐
     │  mToken A  │             │  mToken B    │
     │  (e.g.     │             │  (e.g.       │
     │   mUSDC)   │             │   mWETH)     │
     └────────────┘             └──────────────┘
      mint / redeem              borrow / repay
      supply / withdraw          liquidateBorrow
```

All user-facing operations (supply, borrow, repay, withdraw, liquidate) go through mToken contracts. The Comptroller enforces collateral requirements and risk limits behind the scenes.

## Components

| Component                                                   | Purpose                                                            |
| ----------------------------------------------------------- | ------------------------------------------------------------------ |
| [mTokens](/moonwell/developers/protocol/mtokens.md)         | Market contracts - supply, borrow, repay, withdraw, liquidate      |
| [Comptroller](/moonwell/developers/protocol/comptroller.md) | Policy layer - collateral, health checks, risk parameters, rewards |
| [OEV](/moonwell/developers/protocol/oev.md)                 | Oracle wrappers - early price access for liquidations              |
| [4626 Vaults](/moonwell/developers/protocol/4626-vaults.md) | ERC-4626 wrappers around mToken markets                            |

## Where to Start

| Goal                                     | Start here                                                                                                               |
| ---------------------------------------- | ------------------------------------------------------------------------------------------------------------------------ |
| Integrate Moonwell lending markets       | [Guide: Core Market Integration](/moonwell/developers/guides/core-market-integration.md)                                 |
| Build a yield product on top of Moonwell | [Guide: Vault Integration](/moonwell/developers/guides/vault-integration.md)                                             |
| Build an OEV liquidation bot             | [Guide: OEV Liquidator Bot](/moonwell/developers/guides/oev-liquidator.md)                                               |
| Full mToken function reference           | [mTokens](/moonwell/developers/protocol/mtokens.md) - `mint()`, `redeem()`, `borrow()`, `liquidateBorrow()`              |
| Full Comptroller function reference      | [Comptroller](/moonwell/developers/protocol/comptroller.md) - `enterMarkets()`, `getAccountLiquidity()`, `claimReward()` |
| Understand risk controls                 | [Comptroller - Risk Parameters](/moonwell/developers/protocol/comptroller/risk-parameters.md)                            |
| OEV mechanism details                    | [OEV](/moonwell/developers/protocol/oev.md) - `updatePriceEarlyAndLiquidate()`                                           |

## Key Patterns

**Error handling** - mToken and Comptroller functions use two failure modes:

* **Error codes** - Business logic failures return a non-zero `uint` without reverting. Always check the return value.
* **Reverts** - Transfer failures, math overflows, and pause/cap enforcement revert the transaction.

**Interest accrual** - Interest accrues per-second (not per-block). The exchange rate between mTokens and underlying grows automatically as interest accrues.

**Collateral flow** - Supply → `enterMarkets()` → Borrow. You must explicitly enable an asset as collateral before borrowing against it.

For step-by-step integration walkthroughs, see the [Guides](/moonwell/developers/guides.md).


---

# Agent Instructions: 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:

```
GET https://docs.moonwell.fi/moonwell/developers/protocol.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
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.