Uni V3: getPriceFromTick

getPrice.js

const JSBI = require('jsbi')
const { TickMath, FullMath } = require('@uniswap/v3-sdk')

const baseToken = '0x2260FAC5E5542a773Aa44fBCfeDf7C193bc2C599' // WETH
const quoteToken = '0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2' // WBTC

async function main(
  baseToken,
  quoteToken,
  inputAmount,
  currentTick,
  baseTokenDecimals,
  quoteTokenDecimals
) {
  const sqrtRatioX96 = TickMath.getSqrtRatioAtTick(currentTick)
  const ratioX192 = JSBI.multiply(sqrtRatioX96, sqrtRatioX96)

  const baseAmount = JSBI.BigInt( inputAmount * (10 ** baseTokenDecimals))

  const shift = JSBI.leftShift( JSBI.BigInt(1), JSBI.BigInt(192))

  const quoteAmount = FullMath.mulDivRoundingUp(ratioX192, baseAmount, shift)
  console.log('quoteAmount', quoteAmount.toString() / (10**quoteTokenDecimals))

  return quoteAmount
}

main(
  baseToken,
  quoteToken,
  1,
  257109,
  8,
  18,
)

package.json

{
  "name": "priceFromTick",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@uniswap/v3-periphery": "^1.4.0",
    "@uniswap/v3-sdk": "^3.9.0",
    "dotenv": "^16.0.3",
    "ethers": "^5.7.2",
    "jsbi": "^3.2.5"
  }
}

this code does nothing