web3.js

web3.js

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+const { ethers } = require("ethers");
+const { ChainId, Token, TokenAmount, Pair, Route, Trade, TradeType, WETH, Fetcher, Percent } = require('@uniswap/sdk');
+
+async function main() {
+    // 1. Set up your environment with ethers.js
+    const provider = new ethers.providers.JsonRpcProvider("YOUR_RPC_ENDPOINT");
+    const wallet = new ethers.Wallet("YOUR_PRIVATE_KEY", provider);
+
+    // 2. Connect to an Ethereum provider (Uniswap uses mainnet)
+    const chainId = ChainId.MAINNET;
+
+    // 3. Use ethers.js to interact with Uniswap's smart contract
+    // Example: Swapping ETH for DAI
+    const DAI = new Token(chainId, "0x6B175474E89094C44Da98b954EedeAC495271d0F", 18);
+    const pair = await Fetcher.fetchPairData(WETH[chainId], DAI);
+
+    const route = new Route([pair], WETH[chainId]);
+    const trade = new Trade(route, new TokenAmount(WETH[chainId], '1000000000000000000'), TradeType.EXACT_INPUT);
+
+    console.log("Execution Price:", trade.executionPrice.toSignificant(6));
+    console.log("Next Mid Price:", trade.nextMidPrice.toSignificant(6));
+
+    const slippageTolerance = new Percent("50", "10000"); // 0.50% slippage tolerance
+    const amountOutMin = trade.minimumAmountOut(slippageTolerance);
+
+    // Set up Uniswap contract
+    const uniswap = new ethers.Contract(
+        "UNISWAP_ROUTER_ADDRESS", // Address of Uniswap router contract
+        [
+            "function swapExactETHForTokens(uint amountOutMin, address[] calldata path, address to, uint deadline) external payable returns (uint[] memory amounts)",
+        ],
+        wallet
+    );
+
+    // Execute swap
+    const tx = await uniswap.swapExactETHForTokens(
+        amountOutMin.raw.toString(),
+        [WETH[chainId].address, DAI.address],
+        wallet.address,
+        Math.floor(Date.now() / 1000) + 60 * 20, // 20 minutes from now
+        { value: ethers.utils.parseEther("1"), gasPrice: ethers.utils.parseUnits("50", "gwei") } // Example: sending 1 ETH
+    );
+
+    console.log("Transaction Hash:", tx.hash);
+}
+
+main().then(() => process.exit(0)).catch(error => {
+    console.error(error);
+    process.exit(1);
+});