Get MATIC/USDC pair via Uniwap

index.ts

import { Token } from "@uniswap/sdk-core";
import { abi as IUniswapV3PoolABI } from "@uniswap/v3-core/artifacts/contracts/interfaces/IUniswapV3Pool.sol/IUniswapV3Pool.json";
import { Pool } from "@uniswap/v3-sdk";
import { ethers } from "ethers";

async function main() {
  const provider = new ethers.providers.InfuraProvider();

  const poolAddress = "0x07a6e955ba4345bae83ac2a6faa771fddd8a2011";

  const poolContract = new ethers.Contract(
    poolAddress,
    IUniswapV3PoolABI,
    provider
  );

  const token0 = await poolContract.token0();
  const token1 = await poolContract.token1();
  const fee = await poolContract.fee();

  const MATIC = new Token(1, token0, 18, "Matic");
  const USDC = new Token(1, token1, 6, "USDC");

  const slot = await poolContract.slot0();
  const state = {
    liquidity: await poolContract.liquidity(),
    sqrtPriceX96: slot[0],
    tick: slot[1],
    observationIndex: slot[2],
    observationCardinality: slot[3],
    observationCardinalityNext: slot[4],
    feeProtocol: slot[5],
    unlocked: slot[6],
  };

  const MATIC_USDC_POOL = new Pool(
    MATIC,
    USDC,
    fee,
    state.sqrtPriceX96.toString(),
    state.liquidity.toString(),
    state.tick
  );

  const price = MATIC_USDC_POOL.token0Price.toSignificant();

  console.log("MATIC:", price);
}

if (require.main === module) {
  main();
}

package.json

{
  "name": "uniswap-pricing",
  "version": "1.0.0",
  "main": "index.js",
  "dependencies": {
    "@types/node": "^17.0.0",
    "@uniswap/sdk-core": "^3.0.1",
    "@uniswap/v3-core": "^1.0.0",
    "@uniswap/v3-sdk": "^3.6.3",
    "ethers": "^5.5.2",
    "ts-node": "^10.4.0",
    "typescript": "^4.5.4"
  },
  "license": "MIT"
}