---
description: >-
  This documentation provides an overview of the ISlimRouter.sol contract, which
  defines the functions & events for conducting token swaps & managing token
  balances. The IRouter inherits this contract.
---

# SlimRouter

## **Table of Contents**

* [**Contract Details**](#contract-details)
* [**Structs**](#structs)
  * [ExactInputSingleParams](#struct-exactinputsingleparams)
  * [ExactOutputSingleParams](#struct-exactoutputsingleparams)
* [**Functions**](#functions)
  * [WETH9()](#fn-weth9)
  * [exactInputSingle()](#fn-exactinputsingle)
  * [exactOutputSingle()](#fn-exactoutputsingle)
  * [unwrapWETH9()](#fn-unwrapweth9)
  * [refundETH()](#fn-refundeth)
  * [sweepToken()](#fn-sweeptoken)

## **Contract Details** <a href="#contract-details" id="contract-details"></a>

* **Name :** _ISlimRouter_
* **Solidity Version :** _^0.8.0_
* _SPDX License-Identifier : GPL-2.0-or-later_
* Code: [Github](https://github.com/maverickprotocol/router-v1/blob/main/contracts/interfaces/ISlimRouter.sol)

## **Structs** <a href="#structs" id="structs"></a>

### ExactInputSingleParams <a href="#struct-exactinputsingleparams" id="struct-exactinputsingleparams"></a>

```solidity
struct ExactInputSingleParams {
    address tokenIn;
    address tokenOut;
    IPool pool;
    address recipient;
    uint256 deadline;
    uint256 amountIn;
    uint256 amountOutMinimum;
    uint256 sqrtPriceLimitD18;
}
```

* `tokenIn` : The address of the token to be swapped.
* `tokenOut` : The address of the desired token to receive in the swap.
* `pool` : An instance of the IPool interface representing the pool to perform the swap in.
* `recipient` : The address where the swapped tokens will be sent.
* `deadline` : The deadline timestamp for the swap to be executed before it expires.
* `amountIn` : The amount of tokenIn token to be swapped.
* `amountOutMinimum` : The minimum amount of tokenOut tokens expected to be received from the swap.
* `sqrtPriceLimitD18` : The square root of the price limit for the swap, represented with 18 decimal places.

### ExactOutputSingleParams <a href="#struct-exactoutputsingleparams" id="struct-exactoutputsingleparams"></a>

```solidity
struct ExactOutputSingleParams {
    address tokenIn;
    address tokenOut;
    IPool pool;
    address recipient;
    uint256 deadline;
    uint256 amountOut;
    uint256 amountInMaximum;
}
```

* `tokenIn` : The address of the token to be used as input in the swap.
* `tokenOut` : The address of the token to be received as output in the swap.
* `pool` : An instance of the IPool interface representing the pool to perform the swap in.
* `recipient` : The address where the swapped tokens will be sent.
* `deadline` : The deadline timestamp for the swap to be executed before it expires.
* `amountOut` : The desired amount of tokenOut tokens to be received from the swap.
* `amountInMaximum` : The maximum amount of tokenIn tokens to be used for the swap.

## **Functions** <a href="#functions" id="functions"></a>

### WETH9() <a href="#fn-weth9" id="fn-weth9"></a>

Retrieves the address of the WETH9 token.

```solidity
function WETH9() external view returns (IWETH9);
```

* Returns :
  * `IWETH9` : An instance of the `IWETH9` interface representing the WETH9 token.

### exactInputSingle() <a href="#fn-exactinputsingle" id="fn-exactinputsingle"></a>

Swaps `amountIn` of one token for as much as possible of another token.

```solidity
function exactInputSingle(ExactInputSingleParams calldata params) external payable returns (uint256 amountOut);
```

* Parameters :
  * `params` : The parameters necessary for the swap, encoded as `ExactInputSingleParams` structure in calldata.
* Returns :
  * `amountOut` : The amount of the received token `uint256`.

### exactOutputSingle() <a href="#fn-exactoutputsingle" id="fn-exactoutputsingle"></a>

Swaps as little as possible of one token for `amountOut` of another token.

```solidity
function exactOutputSingle(ExactOutputSingleParams calldata params) external payable returns (uint256 amountIn);
```

* Parameters :
  * `params` : The parameters necessary for the swap, encoded as `ExactOutputSingleParams` structure in calldata.
* Returns:
  * `amountIn` : The amount of the input token `uint256`.

### unwrapWETH9() <a href="#fn-unwrapweth9" id="fn-unwrapweth9"></a>

Unwraps the contract's `WETH9` balance and sends it to the specified recipient as `ETH`.

```solidity
function unwrapWETH9(uint256 amountMinimum, address recipient) external payable;
```

* Parameters:
  * `amountMinimum` : The `minimum amount` of `WETH9` to unwrap.
  * `recipient` : The `address` receiving ETH.

### refundETH() <a href="#fn-refundeth" id="fn-refundeth"></a>

Refunds any `ETH` balance held by this contract to the `msg.sender`.

```solidity
function refundETH() external payable;
```

### sweepToken() <a href="#fn-sweeptoken" id="fn-sweeptoken"></a>

Transfers the full amount of a specified token held by this contract to the recipient.

```solidity
function sweepToken(IERC20 token, uint256 amountMinimum, address recipient) external payable;
```

* Parameters:
  * `token` : The contract `address` of the token to be transferred.
  * `amountMinimum` : The `minimum amount` of token `uint256` required for the transfer.
  * `recipient` : The destination `address` of the token.
