V2Factory

The Factory contract is responsible for creating and managing unique liquidity pools for various token pairs. The receiver of the trading fees among these liquidity pools is set on this contract.

The full contract can be found here.

Events​

PairCreated​

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

Emitted each time a pair is created via createPair.

• token0 is guaranteed to be strictly less than token1 by sort order.

• The final uint log value will be 1 for the first pair created, 2 for the second, etc. (see allPairs/getPair).

Read-Only Functions​

allPairs​

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

Returns the address of the nth pair (0-indexed) created through the factory, or address(0) (0x0000000000000000000000000000000000000000) if not enough pairs have been created yet.

• Pass 0 for the address of the first pair created, 1 for the second, etc.

getPair​

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

Returns the address of the pair for tokenA and tokenB, if it has been created, else address(0) (0x0000000000000000000000000000000000000000).

• tokenA and tokenB are interchangeable.

Parameters​

Name	Type	Description
tokenA	address	address of one of the tokens in the pair
tokenB	address	address of the other token in the pair

allPairsLength​

function allPairsLength() external view returns (uint);

Returns the total number of pairs created through the factory so far.

feeTo​

function feeTo() external view returns (address);

Returns the address of where the feeTo is set to. If address(0) then the fees are not turned on.

feeToSetter​

function feeToSetter() external view returns (address);

The address allowed to change feeTo.

State-Changing Functions​

createPair​

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

Creates a pair for tokenA and tokenB if one doesn't exist already.

• tokenA and tokenB are interchangeable.

• Emits PairCreated.

• tokenA and tokenB are interchangeable.

Name	Type	Description
tokenA	address	address of one of the tokens in the pair
tokenB	address	address of the other token in the pair

setFeeTo​

function setFeeTo(address _feeTo) external;

Sets the feeTo

Parameters​

Name	Type	Description
_feeTo	address	address of where to send protocol fees to

setFeeToSetter​

function setFeeToSetter(address _feeToSetter) external;

Sets the feeToSetter.

Parameters​

Name	Type	Description
_feeToSetter	address	address that can change the feeTo address

Interface​

pragma solidity >=0.5.0;

interface IUniswapV2Factory {
    event PairCreated(address indexed token0, address indexed token1, address pair, uint);

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

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

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

    function setFeeTo(address) external;
    function setFeeToSetter(address) external;
}