> For the complete documentation index, see [llms.txt](https://docs.babydogeswap.com/babydoge-docs-1/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.babydogeswap.com/babydoge-docs-1/developers/smart-contracts/babydogeswap/factory.md).

# Factory

{% hint style="warning" %}
BabyDogeSwap is based on Uniswap v2. Read the [Uniswap v2 documentation](https://uniswap.org/docs/v2/).\
For more in-depth information on the core contract logic, read the [Uniswap v2 Core whitepaper](https://uniswap.org/whitepaper.pdf).
{% endhint %}

## Contract info

**Contract name:** BabyDogeSwapFactory\
**Contract address:** [0x4693B62E5fc9c0a45F89D62e6300a03C85f43137](https://bscscan.com/address/0x4693B62E5fc9c0a45F89D62e6300a03C85f43137#code)

## Read functions

### getPair

`function getPair(address tokenA, address tokenB) external view returns (address pair);`

Address for `tokenA` and address for `tokenB` return address of pair contract (where one exists).

`tokenA` and `tokenB` order is interchangeable.

Returns `0x0000000000000000000000000000000000000000` as address where no pair exists.

### allPairs

`function allPairs(uint) external view returns (address pair);`

Returns the address of the `n`th pair (`0`-indexed) created through the Factory contract.

Returns `0x0000000000000000000000000000000000000000` where pair has not yet been created.

Begins at `0` for first created pair.

### allPairsLength

`function allPairsLength() external view returns (uint);`

Displays the current number of pairs created through the Factory contract as an integer.

### feeTo

`function feeTo() external view returns (address);`

The address to where non-LP-holder fees are sent.

### feeToTreasury

`function feeTo() external view returns (address);`

The Treasury LP manager address to where non-LP-holder fees are sent.

### feeToSetter

`function feeToSetter() external view returns (address);`

The address with permission to set the feeTo address.

## Write functions

### createPair

function createPair(address tokenA, address tokenB) external returns (address pair);

Creates a pair for `tokenA` and `tokenB` where a pair doesn't already exist.

`tokenA` and `tokenB` order is interchangeable.

Emits `PairCreated` (see Events).

### setFeeTo

Sets address for `feeTo`.

### setFeeToSetter

Sets address for permission to adjust `feeTo`.

## Events

### PairCreated

`event PairCreated(address indexed token0, address indexed token1, address pair, uint);`

Emitted whenever a `createPair` creates a new pair.

`token0` will appear before `token1` in sort order.

The final `uint` log value will be `1` for the first pair created, `2` for the second, etc.

## Interface

```
pragma solidity =0.5.16;


interface IBabyDogeFactory {
  function feeTo() external view returns (address);
  function feeToTreasury() external view returns (address);
  function feeToSetter() external view returns (address);

  function getPair(address tokenA, address tokenB)
    external
    view
    returns (address pair);

  function allPairs(uint256) external view returns (address pair);

  function allPairsLength() external view returns (uint256);

  function createPair(address tokenA, address tokenB)
    external
    returns (address pair);

  function setRouter(address) external;

  function setFeeTo(
    address _feeTo,
    address _feeToTreasury
  ) external;

  function setFeeToSetter(address) external;
}

```


---

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