Factory

Code

UniswapV2Factory.sol

Address

UniswapV2Factory is deployed at 0xe2f197885abe8ec7c866cFf76605FD06d4576218 on the Ropsten, Rinkeby, Görli, and Kovan testnets.

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

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.
  • Pair addresses can also be calculated deterministically, see Pair Addresses.

allPairs

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

Returns the address of the nth pairr (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);

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

feeTo

function feeTo() external view returns (address);

See Protocol Charge Calculation.

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.

Interface

pragma solidity =0.5.16;

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);
}

ABI

[
{
"anonymous": false,
"inputs": [
{ "indexed": true, "internalType": "address", "name": "token0", "type": "address" },
{ "indexed": true, "internalType": "address", "name": "token1", "type": "address" },
{ "indexed": false, "internalType": "address", "name": "pair", "type": "address" },
{ "indexed": false, "internalType": "uint256", "name": "", "type": "uint256" }
],
"name": "PairCreated",
"type": "event"
},
{
"constant": true,
"inputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
"name": "allPairs",
"outputs": [{ "internalType": "address", "name": "pair", "type": "address" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "allPairsLength",
"outputs": [{ "internalType": "uint256", "name": "", "type": "uint256" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": false,
"inputs": [
{ "internalType": "address", "name": "tokenA", "type": "address" },
{ "internalType": "address", "name": "tokenB", "type": "address" }
],
"name": "createPair",
"outputs": [{ "internalType": "address", "name": "pair", "type": "address" }],
"payable": false,
"stateMutability": "nonpayable",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "feeTo",
"outputs": [{ "internalType": "address", "name": "", "type": "address" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [],
"name": "feeToSetter",
"outputs": [{ "internalType": "address", "name": "", "type": "address" }],
"payable": false,
"stateMutability": "view",
"type": "function"
},
{
"constant": true,
"inputs": [
{ "internalType": "address", "name": "tokenA", "type": "address" },
{ "internalType": "address", "name": "tokenB", "type": "address" }
],
"name": "getPair",
"outputs": [{ "internalType": "address", "name": "pair", "type": "address" }],
"payable": false,
"stateMutability": "view",
"type": "function"
}
]

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