Code

UniswapV2Factory.sol

Address

UniswapV2Factory is deployed at 0xA818b4F111Ccac7AA31D0BCc0806d64F2E0737D7 on xDai.

Events

PairCreated

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

getPair

function getPair(address tokenA, address tokenB) external view returns (address pair);
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Returns the address of the pair for tokenA and tokenB, if it has been created, else address(0) (0x0000000000000000000000000000000000000000).

• tokenA and tokenB are interchangeable.
• Pair addresses can also be calculated deterministically, see Pair Addresses.

allPairs

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

allPairsLength

function allPairsLength() external view returns (uint);
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Returns the total number of pairs created through the factory so far.

feeTo

function feeTo() external view returns (address);
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See Protocol Charge Calculation.

feeToSetter

function feeToSetter() external view returns (address);
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The address allowed to change feeTo.

State-Changing Functions

createPair

function createPair(address tokenA, address tokenB) external returns (address pair);
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Creates a pair for tokenA and tokenB if one doesn’t exist already.

• tokenA and tokenB are interchangeable.
• Emits PairCreated.

Interface

import '@uniswap/v2-core/contracts/interfaces/IUniswapV2Factory.sol';
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pragma solidity >=0.5.0;

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

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

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

import IUniswapV2Factory from '@uniswap/v2-core/build/IUniswapV2Factory.json'
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https://unpkg.com/@uniswap/[email protected]/build/IUniswapV2Factory.json