Created
June 17, 2022 15:00
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const Web3 = require('web3'); | |
const BigNumber = require('bignumber.js'); | |
const ERC20ABI = require('./abis/ERC20.json'); | |
const RPC_URL = 'https://evm-cronos.crypto.org'; | |
const calcRemoveLiquidityAmounts = async (lpAmount, tokenAAddress, tokenBAddress, lpAddress) => { | |
const slippage = 0.001; // 0.1% slippage | |
const web3 = new Web3(RPC_URL); | |
const tokenA = new web3.eth.Contract(ERC20ABI, tokenAAddress); | |
const tokenB = new web3.eth.Contract(ERC20ABI, tokenBAddress); | |
const tokenABalance = await | |
tokenA.methods.balanceOf(lpAddress).call(); | |
const tokenBBalance = await tokenB.methods.balanceOf(lpAddress).call() | |
const pair = await new web3.eth.Contract(ERC20ABI, lpAddress); | |
const totalSupply = await pair.methods.totalSupply().call(); | |
const amountA = new BigNumber(lpAmount).div(totalSupply).multipliedBy(tokenABalance).multipliedBy(1 - slippage); | |
const amountB = new BigNumber(lpAmount).div(totalSupply).multipliedBy(tokenBBalance).multipliedBy(1 - slippage); | |
console.log(amountA.integerValue().toFixed(), amountB.integerValue().toFixed()); | |
}; | |
calcRemoveLiquidityAmounts( | |
"701540069209", | |
"0xc21223249CA28397B4B6541dfFaEcC539BfF0c59", | |
"0x2D03bECE6747ADC00E1a131BBA1469C15fD11e03", | |
"0x814920d1b8007207db6cb5a2dd92bf0b082bdba1" | |
); |
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