Using web3js get coin price on uniswap and sushiswap exchange without using their api

Question

I want to get token prices for uniswap and sushiswap exchange by using web.js

I am new to the crypto dev world, so please elaborate as much you can and if possible an example will be a lifesaver.
This is the best shot I could make... but don't know how to get V3_pool_ABI value

const JSBI = require('jsbi');
const Web3 = require('web3');

(async () => {
  const web3 = new Web3(new Web3.providers.HttpProvider('https://mainnet.infura.io/v3/d5658a9beace4cd98d2c1216cf66b56a'));
  
  var factoryV3 = new web3.eth.Contract(
    [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"uint24","name":"fee","type":"uint24"},{"indexed":true,"internalType":"int24","name":"tickSpacing","type":"int24"}],"name":"FeeAmountEnabled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"oldOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnerChanged","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"token0","type":"address"},{"indexed":true,"internalType":"address","name":"token1","type":"address"},{"indexed":true,"internalType":"uint24","name":"fee","type":"uint24"},{"indexed":false,"internalType":"int24","name":"tickSpacing","type":"int24"},{"indexed":false,"internalType":"address","name":"pool","type":"address"}],"name":"PoolCreated","type":"event"},{"inputs":[{"internalType":"address","name":"tokenA","type":"address"},{"internalType":"address","name":"tokenB","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"}],"name":"createPool","outputs":[{"internalType":"address","name":"pool","type":"address"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"int24","name":"tickSpacing","type":"int24"}],"name":"enableFeeAmount","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint24","name":"","type":"uint24"}],"name":"feeAmountTickSpacing","outputs":[{"internalType":"int24","name":"","type":"int24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"","type":"address"},{"internalType":"address","name":"","type":"address"},{"internalType":"uint24","name":"","type":"uint24"}],"name":"getPool","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"owner","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"parameters","outputs":[{"internalType":"address","name":"factory","type":"address"},{"internalType":"address","name":"token0","type":"address"},{"internalType":"address","name":"token1","type":"address"},{"internalType":"uint24","name":"fee","type":"uint24"},{"internalType":"int24","name":"tickSpacing","type":"int24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"_owner","type":"address"}],"name":"setOwner","outputs":[],"stateMutability":"nonpayable","type":"function"}], 
    '0x1F98431c8aD98523631AE4a59f267346ea31F984'
  );
  var pool_address = await factoryV3.methods.getPool('0x6b175474e89094c44da98b954eedeac495271d0f', '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2', 3000).call();
  var pool_1 = new web3.eth.Contract(V3_pool_ABI, pool_address);
  var pool_balance = await pool_1.methods.slot0.call().call();
  var sqrtPriceX96 = pool_balance[0];
  var number_1 =JSBI.BigInt(sqrtPriceX96 *sqrtPriceX96* (1e18)/(1e18)/JSBI.BigInt(2) ** (JSBI.BigInt(192)));
})();

Acadian

Answer 1

The answer would be using oracle contracts, many defi apps depend on there price also.

How you would get it in solidity: (link to blog)

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.7;

import "@chainlink/contracts/src/v0.8/interfaces/AggregatorV3Interface.sol";

contract PriceConsumerV3 {

    AggregatorV3Interface internal priceFeed;

    /**
     * Network: Kovan
     * Aggregator: ETH/USD
     * Address: 0x9326BFA02ADD2366b30bacB125260Af641031331
     */
    constructor() {
        priceFeed = AggregatorV3Interface(0x9326BFA02ADD2366b30bacB125260Af641031331);
    }

    /**
     * Returns the latest price
     */
    function getLatestPrice() public view returns (int) {
        (
            uint80 roundID, 
            int price,
            uint startedAt,
            uint timeStamp,
            uint80 answeredInRound
        ) = priceFeed.latestRoundData();
        return price;
    }
}

This can be replicated in js using the web3 library, just get this contract and use its functionality.

Acadian

Answer 2

Each pool is created from a factory contract, and they all use the same ABI.

You can lookup any of the valid pool addresses, for example the code from your question results in 0xC2e9F25Be6257c210d7Adf0D4Cd6E3E881ba25f8, and its ABI is already published.

var V3_pool_ABI = [{"inputs":[],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"int24","name":"tickLower","type":"int24"},{"indexed":true,"internalType":"int24","name":"tickUpper","type":"int24"},{"indexed":false,"internalType":"uint128","name":"amount","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"amount0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1","type":"uint256"}],"name":"Burn","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":false,"internalType":"address","name":"recipient","type":"address"},{"indexed":true,"internalType":"int24","name":"tickLower","type":"int24"},{"indexed":true,"internalType":"int24","name":"tickUpper","type":"int24"},{"indexed":false,"internalType":"uint128","name":"amount0","type":"uint128"},{"indexed":false,"internalType":"uint128","name":"amount1","type":"uint128"}],"name":"Collect","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint128","name":"amount0","type":"uint128"},{"indexed":false,"internalType":"uint128","name":"amount1","type":"uint128"}],"name":"CollectProtocol","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"uint256","name":"amount0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"paid0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"paid1","type":"uint256"}],"name":"Flash","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint16","name":"observationCardinalityNextOld","type":"uint16"},{"indexed":false,"internalType":"uint16","name":"observationCardinalityNextNew","type":"uint16"}],"name":"IncreaseObservationCardinalityNext","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint160","name":"sqrtPriceX96","type":"uint160"},{"indexed":false,"internalType":"int24","name":"tick","type":"int24"}],"name":"Initialize","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"owner","type":"address"},{"indexed":true,"internalType":"int24","name":"tickLower","type":"int24"},{"indexed":true,"internalType":"int24","name":"tickUpper","type":"int24"},{"indexed":false,"internalType":"uint128","name":"amount","type":"uint128"},{"indexed":false,"internalType":"uint256","name":"amount0","type":"uint256"},{"indexed":false,"internalType":"uint256","name":"amount1","type":"uint256"}],"name":"Mint","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint8","name":"feeProtocol0Old","type":"uint8"},{"indexed":false,"internalType":"uint8","name":"feeProtocol1Old","type":"uint8"},{"indexed":false,"internalType":"uint8","name":"feeProtocol0New","type":"uint8"},{"indexed":false,"internalType":"uint8","name":"feeProtocol1New","type":"uint8"}],"name":"SetFeeProtocol","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"sender","type":"address"},{"indexed":true,"internalType":"address","name":"recipient","type":"address"},{"indexed":false,"internalType":"int256","name":"amount0","type":"int256"},{"indexed":false,"internalType":"int256","name":"amount1","type":"int256"},{"indexed":false,"internalType":"uint160","name":"sqrtPriceX96","type":"uint160"},{"indexed":false,"internalType":"uint128","name":"liquidity","type":"uint128"},{"indexed":false,"internalType":"int24","name":"tick","type":"int24"}],"name":"Swap","type":"event"},{"inputs":[{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint128","name":"amount","type":"uint128"}],"name":"burn","outputs":[{"internalType":"uint256","name":"amount0","type":"uint256"},{"internalType":"uint256","name":"amount1","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint128","name":"amount0Requested","type":"uint128"},{"internalType":"uint128","name":"amount1Requested","type":"uint128"}],"name":"collect","outputs":[{"internalType":"uint128","name":"amount0","type":"uint128"},{"internalType":"uint128","name":"amount1","type":"uint128"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint128","name":"amount0Requested","type":"uint128"},{"internalType":"uint128","name":"amount1Requested","type":"uint128"}],"name":"collectProtocol","outputs":[{"internalType":"uint128","name":"amount0","type":"uint128"},{"internalType":"uint128","name":"amount1","type":"uint128"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"factory","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"fee","outputs":[{"internalType":"uint24","name":"","type":"uint24"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeGrowthGlobal0X128","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"feeGrowthGlobal1X128","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"uint256","name":"amount0","type":"uint256"},{"internalType":"uint256","name":"amount1","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"flash","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint16","name":"observationCardinalityNext","type":"uint16"}],"name":"increaseObservationCardinalityNext","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint160","name":"sqrtPriceX96","type":"uint160"}],"name":"initialize","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"liquidity","outputs":[{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"maxLiquidityPerTick","outputs":[{"internalType":"uint128","name":"","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"},{"internalType":"uint128","name":"amount","type":"uint128"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"mint","outputs":[{"internalType":"uint256","name":"amount0","type":"uint256"},{"internalType":"uint256","name":"amount1","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"","type":"uint256"}],"name":"observations","outputs":[{"internalType":"uint32","name":"blockTimestamp","type":"uint32"},{"internalType":"int56","name":"tickCumulative","type":"int56"},{"internalType":"uint160","name":"secondsPerLiquidityCumulativeX128","type":"uint160"},{"internalType":"bool","name":"initialized","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint32[]","name":"secondsAgos","type":"uint32[]"}],"name":"observe","outputs":[{"internalType":"int56[]","name":"tickCumulatives","type":"int56[]"},{"internalType":"uint160[]","name":"secondsPerLiquidityCumulativeX128s","type":"uint160[]"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"bytes32","name":"","type":"bytes32"}],"name":"positions","outputs":[{"internalType":"uint128","name":"liquidity","type":"uint128"},{"internalType":"uint256","name":"feeGrowthInside0LastX128","type":"uint256"},{"internalType":"uint256","name":"feeGrowthInside1LastX128","type":"uint256"},{"internalType":"uint128","name":"tokensOwed0","type":"uint128"},{"internalType":"uint128","name":"tokensOwed1","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"protocolFees","outputs":[{"internalType":"uint128","name":"token0","type":"uint128"},{"internalType":"uint128","name":"token1","type":"uint128"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint8","name":"feeProtocol0","type":"uint8"},{"internalType":"uint8","name":"feeProtocol1","type":"uint8"}],"name":"setFeeProtocol","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"slot0","outputs":[{"internalType":"uint160","name":"sqrtPriceX96","type":"uint160"},{"internalType":"int24","name":"tick","type":"int24"},{"internalType":"uint16","name":"observationIndex","type":"uint16"},{"internalType":"uint16","name":"observationCardinality","type":"uint16"},{"internalType":"uint16","name":"observationCardinalityNext","type":"uint16"},{"internalType":"uint8","name":"feeProtocol","type":"uint8"},{"internalType":"bool","name":"unlocked","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"int24","name":"tickLower","type":"int24"},{"internalType":"int24","name":"tickUpper","type":"int24"}],"name":"snapshotCumulativesInside","outputs":[{"internalType":"int56","name":"tickCumulativeInside","type":"int56"},{"internalType":"uint160","name":"secondsPerLiquidityInsideX128","type":"uint160"},{"internalType":"uint32","name":"secondsInside","type":"uint32"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"recipient","type":"address"},{"internalType":"bool","name":"zeroForOne","type":"bool"},{"internalType":"int256","name":"amountSpecified","type":"int256"},{"internalType":"uint160","name":"sqrtPriceLimitX96","type":"uint160"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"swap","outputs":[{"internalType":"int256","name":"amount0","type":"int256"},{"internalType":"int256","name":"amount1","type":"int256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"int16","name":"","type":"int16"}],"name":"tickBitmap","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"tickSpacing","outputs":[{"internalType":"int24","name":"","type":"int24"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"int24","name":"","type":"int24"}],"name":"ticks","outputs":[{"internalType":"uint128","name":"liquidityGross","type":"uint128"},{"internalType":"int128","name":"liquidityNet","type":"int128"},{"internalType":"uint256","name":"feeGrowthOutside0X128","type":"uint256"},{"internalType":"uint256","name":"feeGrowthOutside1X128","type":"uint256"},{"internalType":"int56","name":"tickCumulativeOutside","type":"int56"},{"internalType":"uint160","name":"secondsPerLiquidityOutsideX128","type":"uint160"},{"internalType":"uint32","name":"secondsOutside","type":"uint32"},{"internalType":"bool","name":"initialized","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token0","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"},{"inputs":[],"name":"token1","outputs":[{"internalType":"address","name":"","type":"address"}],"stateMutability":"view","type":"function"}];

Mixed

Petr Hejda do you know, how can I get the value for uniswap and sushiswap separately – Acadian

@xyzxyz Your current code is using a hardcoded Uniswap factory address. You'll need to run it with a Sushiswap factory, that will generate a different pair contract address. Then you just copy-paste the ABI from the pair contract published data. – Mixed

Petr Hejda Hey I am new to this, can you help me with an example of any single coin price on uniswap and sushiswap. This would really help me in learning all this... This means a lot thank you!! – Acadian