Calculate Pancakeswap Pair Address Offchain

calculatePair.js

/*
In this script you can undestand how to compute offchain an address of any pancakeswap pair
given the pair tokens

This script can be used also to compute any pancakeswap similar dex like 

uniswap ( ethereum )
quickswap ( polygon ) 

by changing the value of the variables

_hexadem 
_factory


*/

const Web3 = require('web3');

let tokenA = "0xbb4cdb9cbd36b01bd1cbaebf2de08d9173bc095c"; // change me!
let tokenB = "0xe9e7cea3dedca5984780bafc599bd69add087d56"; // change me!

let web3 = new Web3("PROVIDER"); // change me!

function getPair(tokenA, tokenB) {
    
    let _hexadem = '0x00fb7f630766e6a796048ea87d01acd3068e8ff67d078148a3fa3f4a84f69bd5';
    let _factory = "0xcA143Ce32Fe78f1f7019d7d551a6402fC5350c73";
    let [token0, token1] = tokenA < tokenB ? [tokenA, tokenB] : [tokenB, tokenA];

    let abiEncoded1 =  web3.eth.abi.encodeParameters(['address', 'address'], [token0, token1]);
    abiEncoded1 = abiEncoded1.split("0".repeat(24)).join("");
    let salt = web3.utils.soliditySha3(abiEncoded1);
    let abiEncoded2 =  web3.eth.abi.encodeParameters(['address', 'bytes32'], [_factory, salt]);
    abiEncoded2 = abiEncoded2.split("0".repeat(24)).join("").substr(2);
    let pair = '0x' + Web3.utils.soliditySha3( '0xff' + abiEncoded2, _hexadem ).substr(26);
    return pair
}

console.log( 'PAIR: ', getPair(tokenA, tokenB) )