BlockmanCodes · April 10, 2022 19:23 · Apr 10, 2022
diff --git a/.env b/.env
@@ -0,0 +1,2 @@
+INFURA_URL=<your_url>
+ETHERSCAN_API_KEY=<your_api_key>
diff --git a/helpers.js b/helpers.js
@@ -0,0 +1,27 @@
+const axios = require('axios')
+
+require('dotenv').config()
+const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY
+
+exports.getAbi = async (address) => {
+  const url = `https://api.etherscan.io/api?module=contract&action=getabi&address=${address}&apikey=${ETHERSCAN_API_KEY}`
+  const res = await axios.get(url)
+  const abi = JSON.parse(res.data.result)
+  return abi
+}
+
+exports.getPoolImmutables = async (poolContract) => {
+  const [token0, token1, fee] = await Promise.all([
+    poolContract.token0(),
+    poolContract.token1(),
+    poolContract.fee(),
+  ])
+
+  const immutables = {
+    token0: token0,
+    token1: token1,
+    fee: fee
+  }
+
+  return immutables
+}
diff --git a/package.json b/package.json
@@ -0,0 +1,18 @@
+{
+  "name": "uniswapbot",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [],
+  "author": "",
+  "license": "ISC",
+  "dependencies": {
+    "@uniswap/v3-sdk": "^3.8.2",
+    "axios": "^0.26.1",
+    "dotenv": "^16.0.0",
+    "ethers": "^5.6.2"
+  }
+}
diff --git a/uniswapBot.js b/uniswapBot.js
@@ -0,0 +1,74 @@
+const { ethers } = require("ethers");
+const { abi: IUniswapV3PoolABI } = require("@uniswap/v3-core/artifacts/contracts/interfaces/IUniswapV3Pool.sol/IUniswapV3Pool.json");
+const { abi: QuoterABI } = require("@uniswap/v3-periphery/artifacts/contracts/lens/Quoter.sol/Quoter.json");
+
+const { getAbi, getPoolImmutables } = require('./helpers')
+
+require('dotenv').config()
+const INFURA_URL = process.env.INFURA_URL
+const ETHERSCAN_API_KEY = process.env.ETHERSCAN_API_KEY
+
+const provider = new ethers.providers.JsonRpcProvider(INFURA_URL)
+
+const poolAddress = '0xcbcdf9626bc03e24f779434178a73a0b4bad62ed'
+
+const quoterAddress = "0xb27308f9F90D607463bb33eA1BeBb41C27CE5AB6"
+
+const getPrice = async (inputAmount) => {
+  const poolContract = new ethers.Contract(
+    poolAddress,
+    IUniswapV3PoolABI,
+    provider
+  )
+
+  const tokenAddress0 = await poolContract.token0();
+  const tokenAddress1 = await poolContract.token1();
+
+  const tokenAbi0 = await getAbi(tokenAddress0)
+  const tokenAbi1 = await getAbi(tokenAddress1)
+
+  const tokenContract0 = new ethers.Contract(
+    tokenAddress0,
+    tokenAbi0,
+    provider
+  )
+  const tokenContract1 = new ethers.Contract(
+    tokenAddress1,
+    tokenAbi1,
+    provider
+  )
+
+  const tokenSymbol0 = await tokenContract0.symbol()
+  const tokenSymbol1 = await tokenContract1.symbol()
+  const tokenDecimals0 = await tokenContract0.decimals()
+  const tokenDecimals1 = await tokenContract1.decimals()
+
+  const quoterContract = new ethers.Contract(
+    quoterAddress,
+    QuoterABI,
+    provider
+  )
+
+  const immutables = await getPoolImmutables(poolContract)
+
+  const amountIn = ethers.utils.parseUnits(
+    inputAmount.toString(),
+    tokenDecimals0
+  )
+
+  const quotedAmountOut = await quoterContract.callStatic.quoteExactInputSingle(
+    immutables.token0,
+    immutables.token1,
+    immutables.fee,
+    amountIn,
+    0
+  )
+
+  const amountOut = ethers.utils.formatUnits(quotedAmountOut, tokenDecimals1)
+
+  console.log('=========')
+  console.log(`${inputAmount} ${tokenSymbol0} can be swapped for ${amountOut} ${tokenSymbol1}`)
+  console.log('=========')
+}
+
+getPrice(1)
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		INFURA_URL=<your_url>
		ETHERSCAN_API_KEY=<your_api_key>