# Pair
This documentation covers DoveSwap-specific functionality. For ERC-20 functionality, see [Pair (ERC-20)](/technical-reference/smart-contracts/pair-erc-20.md).
## Events
### Mint[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#mint)
```solidity
event Mint(address indexed sender, uint amount0, uint amount1);
```
Emitted each time liquidity tokens are created via [mint](#mint-1).
### Burn[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#burn)
```solidity
event Burn(address indexed sender, uint amount0, uint amount1, address indexed to);
```
Emitted each time liquidity tokens are destroyed via [burn](#burn-1).
### Swap[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#swap)
```solidity
event Swap(
address indexed sender,
uint amount0In,
uint amount1In,
uint amount0Out,
uint amount1Out,
address indexed to
);
```
Emitted each time a swap occurs via [swap](#swap-1).
### Sync[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#sync)
```solidity
event Sync(uint112 reserve0, uint112 reserve1);
```
Emitted each time reserves are updated via [mint](#mint-1), [burn](#burn-1), [swap](#swap-1), or [sync](#sync-1).
## Read-Only Functions
### MINIMUM\_LIQUIDITY[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#minimum_liquidity)
```solidity
function MINIMUM_LIQUIDITY() external pure returns (uint);
```
Returns `1000` for all pairs. See [Minimum Liquidity](#minimum_liquidity).
### factory[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#factory)
```solidity
function factory() external view returns (address);
```
Returns the [factory address](/technical-reference/smart-contracts/factory.md#address).
### token0[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#token0)
```solidity
function token0() external view returns (address);
```
Returns the address of the pair token with the lower sort order.
### token1[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#token1)
```solidity
function token1() external view returns (address);
```
Returns the address of the pair token with the higher sort order.
### getReserves[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#getreserves)
```solidity
function getReserves() external view returns (uint112 reserve0, uint112 reserve1, uint32 blockTimestampLast);
```
Returns the reserves of token0 and token1 used to price trades and distribute liquidity. See [Pricing](https://docs.uniswap.org/contracts/v2/concepts/advanced-topics/pricing). Also returns the `block.timestamp` (mod `2**32`) of the last block during which an interaction occured for the pair.
### price0CumulativeLast[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#price0cumulativelast)
```solidity
function price0CumulativeLast() external view returns (uint);
```
See [Oracles](/concepts/core-concepts/oracles.md).
### price1CumulativeLast[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#price1cumulativelast)
```solidity
function price1CumulativeLast() external view returns (uint);
```
See [Oracles](/concepts/core-concepts/oracles.md).
### kLast[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#klast)
```solidity
function kLast() external view returns (uint);
```
Returns the product of the reserves as of the most recent liquidity event. See [Protocol Charge Calculation](/concepts/advanced-concepts/fees.md).
## State-Changing Functions
### mint[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#mint-1)
```solidity
function mint(address to) external returns (uint liquidity);
```
Creates pool tokens.
* Emits [Mint](#mint), [Sync](#sync), [Transfer](/technical-reference/smart-contracts/pair-erc-20.md#transfer).
### burn[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#burn-1)
```solidity
function burn(address to) external returns (uint amount0, uint amount1);
```
Destroys pool tokens.
* Emits [Burn](#burn), [Sync](#sync), [Transfer](/technical-reference/smart-contracts/pair-erc-20.md#transfer).
### swap[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#swap-1)
```solidity
function swap(uint amount0Out, uint amount1Out, address to, bytes calldata data) external;
```
Swaps tokens. For regular swaps, `data.length` must be `0`. Also see [Flash Swaps](/concepts/core-concepts/flash-swaps.md).
* Emits [Swap](#swap), [Sync](#sync).
### skim[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#skim)
```solidity
function skim(address to) external;
```
Functions as a recovery mechanism in case enough tokens are sent to an pair to overflow the two uint112 storage slots for reserves, which could otherwise cause trades to fail. `skim()` allows a user to withdraw the difference between the current balance of the pair and 2\*\*112−1 to the caller, if that difference is greater than 0
### sync[](https://docs.uniswap.org/contracts/v2/reference/smart-contracts/pair#sync-1)
```solidity
function sync() external;
```
Functions as a recovery mechanism in the case that a token asynchronously deflates the balance of a pair. In this case, trades will receive sub-optimal rates, and if no liquidity provider is willing to rectify the situation, the pair is stuck. `sync()` exists to set the reserves of the contract to the current balances, providing a somewhat graceful recoveryfrom this situation
* Emits [Sync](#sync).
---
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