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

# SoroswapFactory

> SoroswapFactory contract overview and interface for creating and indexing one pair per token pair.

Creates one SoroswapPair (Liquidity Pool) smart contract per unique token pair. It does receive as initialization argument the WASM hash of a already installed SoroswapPair smart contract.

Check the code here: [https://github.com/soroswap/core/tree/main/contracts/factory/src](https://github.com/soroswap/core/tree/main/contracts/factory/src)

Here is the contract interface:

```rust theme={null}

pub trait SoroswapFactoryTrait {

    /*  *** Read-only functions: *** */

    /// Returns the recipient of the fee.
    fn fee_to(e: Env) -> Result<Address, FactoryError>;

    /// Returns the address allowed to change `fee_to`.
    fn fee_to_setter(e: Env) -> Result<Address, FactoryError>;

    /// Checks if fees are enabled.
    fn fees_enabled(e: Env) -> Result<bool, FactoryError>;

    /// Returns the total number of pairs created through the factory so far.
    fn all_pairs_length(e: Env) -> Result<u32, FactoryError>;

    /// Returns the address of the pair for `token_a` and `token_b`, if it has been created.
    fn get_pair(e: Env, token_a: Address, token_b: Address) -> Result<Address, FactoryError>;

    /// Returns the address of the nth pair (0-indexed) created through the factory.
    fn all_pairs(e: Env, n: u32) -> Result<Address, FactoryError>;

    /// Returns a boolean indicating if a pair exists for the given `token_a` and `token_b`.
    fn pair_exists(e: Env, token_a: Address, token_b: Address) -> Result<bool, FactoryError>;

    /*  *** State-Changing Functions: *** */

    /// Sets the `fee_to_setter` address and initializes the factory.
    /// 
    /// # Arguments
    /// 
    /// * `e` - An instance of the `Env` struct.
    /// * `setter` - The address to set as the `fee_to_setter`.
    /// * `pair_wasm_hash` - The Wasm hash of the SoroswapPair contract.
    fn initialize(e: Env, setter: Address, pair_wasm_hash: BytesN<32>) -> Result<(), FactoryError>;

    /// Sets the `fee_to` address.
    /// 
    /// # Arguments
    /// 
    /// * `e` - An instance of the `Env` struct.
    /// * `to` - The address to set as the `fee_to`.
    fn set_fee_to(e: Env, to: Address)-> Result<(), FactoryError>;

    /// Sets the `fee_to_setter` address.
    /// 
    /// # Arguments
    /// 
    /// * `e` - An instance of the `Env` struct.
    /// * `new_setter` - The address to set as the new `fee_to_setter`.
    fn set_fee_to_setter(e: Env, new_setter: Address)-> Result<(), FactoryError>;

    /// Sets whether fees are enabled or disabled.
    /// 
    /// # Arguments
    /// 
    /// * `e` - An instance of the `Env` struct.
    /// * `is_enabled` - A boolean indicating whether fees are enabled or disabled.
    fn set_fees_enabled(e: Env, is_enabled: bool)-> Result<(), FactoryError>;

    /// Creates a pair for `token_a` and `token_b` if one doesn't exist already.
    /// 
    /// # Arguments
    /// 
    /// * `e` - An instance of the `Env` struct.
    /// * `token_a` - The address of the first token in the pair.
    /// * `token_b` - The address of the second token in the pair.
    fn create_pair(e: Env, token_a: Address, token_b: Address) -> Result<Address, FactoryError>;
}

```