# Factory Module

#### Structs

**`Pairs`**

```move
struct Pairs has key, store {
    id: UID,
    list: LinkedTable<ID, PairSimpleInfo>,
    index: u64,
}
```

* **Purpose**: Global registry of all trading pairs
* **Access**: Shared object accessible by all users

**`PairSimpleInfo`**

```move
struct PairSimpleInfo has copy, drop, store {
    pair_id: ID,
    pair_key: ID,
    bin_step: u16,
    coin_type_a: TypeName,
    coin_type_b: TypeName
}
```

* **Purpose**: Basic information about a trading pair

#### Events

**`InitFactoryEvent`**

```move
struct InitFactoryEvent has copy, drop {
    pairs_id: ID,
}
```

* **Emitted**: When factory is initialized

**`CreatePairEvent`**

```move
struct CreatePairEvent has copy, drop {
    pair_id: ID,
    bin_step: u16,
    coin_type_a: String,
    coin_type_b: String,
    active_id: u32,
}
```

* **Emitted**: When new trading pair is created

#### Core Functions

**Pair Creation**

* **`create_pair<X, Y>`**: Creates a new trading pair
  * Validates token types and whitelist status
  * Initializes pair with specified parameters
  * Registers pair in global registry
  * Emits creation event

**Pair Management**

* **`set_static_fee_parameters`**: Updates fee structure (admin only)
* **`force_decay`**: Forces volatility decay (admin only)
* **`pause_pair`**: Pauses/unpauses trading (admin only)
* **`increase_oracle_length`**: Expands price oracle capacity (admin only)

**View Functions**

* **`new_pair_key<X, Y>`**: Generates deterministic pair key
* **`pool_simple_info`**: Retrieves pair information
* **`index`**: Gets total number of pairs created