{"id":39635,"date":"2025-01-28T11:33:49","date_gmt":"2025-01-28T11:33:49","guid":{"rendered":"https:\/\/mycryptomania.com\/?p=39635"},"modified":"2025-01-28T11:33:49","modified_gmt":"2025-01-28T11:33:49","slug":"how-to-programmatically-swap-a-v3-dex","status":"publish","type":"post","link":"https:\/\/mycryptomania.com\/?p=39635","title":{"rendered":"How to Programmatically Swap a V3 DEX"},"content":{"rendered":"

Overview<\/h3>\n

Swaps can be done through a website or programmatically through a standard Uniswap V3 API interface.<\/p>\n

Below are the requirements<\/p>\n

Nodejsethersdotenv<\/p>\n

Below is the full source\u00a0code:<\/p>\n

import { ethers } from “ethers”;
import “dotenv\/config”;<\/p>\n

const QUOTER_CONTRACT_ADDRESS = “0x0880484412B5bAa18B3fa2904a500c08f0fE79D2”;
\/\/ prettier-ignore
const QUOTER_ABI = [ { “inputs”: [ { “internalType”: “address”, “name”: “_factory”, “type”: “address” }, { “internalType”: “address”, “name”: “_WETH9”, “type”: “address” } ], “stateMutability”: “nonpayable”, “type”: “constructor” }, { “inputs”: [], “name”: “WETH9”, “outputs”: [{ “internalType”: “address”, “name”: “”, “type”: “address” }], “stateMutability”: “view”, “type”: “function” }, { “inputs”: [], “name”: “factory”, “outputs”: [{ “internalType”: “address”, “name”: “”, “type”: “address” }], “stateMutability”: “view”, “type”: “function” }, { “inputs”: [ { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” }, { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” } ], “name”: “quoteExactInput”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” }, { “internalType”: “uint160[]”, “name”: “sqrtPriceX96AfterList”, “type”: “uint160[]” }, { “internalType”: “uint32[]”, “name”: “initializedTicksCrossedList”, “type”: “uint32[]” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “components”: [ { “internalType”: “address”, “name”: “tokenIn”, “type”: “address” }, { “internalType”: “address”, “name”: “tokenOut”, “type”: “address” }, { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint24”, “name”: “fee”, “type”: “uint24” }, { “internalType”: “uint160”, “name”: “sqrtPriceLimitX96”, “type”: “uint160” } ], “internalType”: “struct IQuoterV2.QuoteExactInputSingleParams”, “name”: “params”, “type”: “tuple” } ], “name”: “quoteExactInputSingle”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” }, { “internalType”: “uint160”, “name”: “sqrtPriceX96After”, “type”: “uint160” }, { “internalType”: “uint32”, “name”: “initializedTicksCrossed”, “type”: “uint32” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” }, { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” } ], “name”: “quoteExactOutput”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint160[]”, “name”: “sqrtPriceX96AfterList”, “type”: “uint160[]” }, { “internalType”: “uint32[]”, “name”: “initializedTicksCrossedList”, “type”: “uint32[]” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “components”: [ { “internalType”: “address”, “name”: “tokenIn”, “type”: “address” }, { “internalType”: “address”, “name”: “tokenOut”, “type”: “address” }, { “internalType”: “uint256”, “name”: “amount”, “type”: “uint256” }, { “internalType”: “uint24”, “name”: “fee”, “type”: “uint24” }, { “internalType”: “uint160”, “name”: “sqrtPriceLimitX96”, “type”: “uint160” } ], “internalType”: “struct IQuoterV2.QuoteExactOutputSingleParams”, “name”: “params”, “type”: “tuple” } ], “name”: “quoteExactOutputSingle”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint160”, “name”: “sqrtPriceX96After”, “type”: “uint160” }, { “internalType”: “uint32”, “name”: “initializedTicksCrossed”, “type”: “uint32” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “internalType”: “int256”, “name”: “amount0Delta”, “type”: “int256” }, { “internalType”: “int256”, “name”: “amount1Delta”, “type”: “int256” }, { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” } ], “name”: “uniswapV3SwapCallback”, “outputs”: [], “stateMutability”: “view”, “type”: “function” } ]<\/p>\n

const provider = new ethers.JsonRpcProvider(“https:\/\/rpc.o.xyz\/”);
const quoterContract = new ethers.Contract(
QUOTER_CONTRACT_ADDRESS,
QUOTER_ABI,
provider
);
const signer = new ethers.Wallet(process.env.PRIVATE_KEY!, provider);<\/p>\n

const params = {
tokenIn: “0xc7C3cff325c6976965edfEB05c024584e4e4BBDD”,
tokenOut: “0x91d70c3adde2f0f0c4fb0b2de69f37a7c7e326df”,
fee: 3000,
recipient: signer.address,
deadline: Math.floor(new Date().getTime() \/ 1000 + 60 * 10),
amountIn: ethers.parseUnits(“0.01”),
sqrtPriceLimitX96: 0,
};<\/p>\n

main();
async function main() {
const transaction =
await quoterContract.quoteExactInputSingle.populateTransaction(params);
console.log({ transaction });<\/p>\n

const receipt = await signer.sendTransaction(transaction);
console.log({ receipt });
}<\/p>\n

Define Variables<\/h3>\n

const QUOTER_CONTRACT_ADDRESS = “0x0880484412B5bAa18B3fa2904a500c08f0fE79D2”;
\/\/ prettier-ignore
const QUOTER_ABI = [ { “inputs”: [ { “internalType”: “address”, “name”: “_factory”, “type”: “address” }, { “internalType”: “address”, “name”: “_WETH9”, “type”: “address” } ], “stateMutability”: “nonpayable”, “type”: “constructor” }, { “inputs”: [], “name”: “WETH9”, “outputs”: [{ “internalType”: “address”, “name”: “”, “type”: “address” }], “stateMutability”: “view”, “type”: “function” }, { “inputs”: [], “name”: “factory”, “outputs”: [{ “internalType”: “address”, “name”: “”, “type”: “address” }], “stateMutability”: “view”, “type”: “function” }, { “inputs”: [ { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” }, { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” } ], “name”: “quoteExactInput”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” }, { “internalType”: “uint160[]”, “name”: “sqrtPriceX96AfterList”, “type”: “uint160[]” }, { “internalType”: “uint32[]”, “name”: “initializedTicksCrossedList”, “type”: “uint32[]” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “components”: [ { “internalType”: “address”, “name”: “tokenIn”, “type”: “address” }, { “internalType”: “address”, “name”: “tokenOut”, “type”: “address” }, { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint24”, “name”: “fee”, “type”: “uint24” }, { “internalType”: “uint160”, “name”: “sqrtPriceLimitX96”, “type”: “uint160” } ], “internalType”: “struct IQuoterV2.QuoteExactInputSingleParams”, “name”: “params”, “type”: “tuple” } ], “name”: “quoteExactInputSingle”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” }, { “internalType”: “uint160”, “name”: “sqrtPriceX96After”, “type”: “uint160” }, { “internalType”: “uint32”, “name”: “initializedTicksCrossed”, “type”: “uint32” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” }, { “internalType”: “uint256”, “name”: “amountOut”, “type”: “uint256” } ], “name”: “quoteExactOutput”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint160[]”, “name”: “sqrtPriceX96AfterList”, “type”: “uint160[]” }, { “internalType”: “uint32[]”, “name”: “initializedTicksCrossedList”, “type”: “uint32[]” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “components”: [ { “internalType”: “address”, “name”: “tokenIn”, “type”: “address” }, { “internalType”: “address”, “name”: “tokenOut”, “type”: “address” }, { “internalType”: “uint256”, “name”: “amount”, “type”: “uint256” }, { “internalType”: “uint24”, “name”: “fee”, “type”: “uint24” }, { “internalType”: “uint160”, “name”: “sqrtPriceLimitX96”, “type”: “uint160” } ], “internalType”: “struct IQuoterV2.QuoteExactOutputSingleParams”, “name”: “params”, “type”: “tuple” } ], “name”: “quoteExactOutputSingle”, “outputs”: [ { “internalType”: “uint256”, “name”: “amountIn”, “type”: “uint256” }, { “internalType”: “uint160”, “name”: “sqrtPriceX96After”, “type”: “uint160” }, { “internalType”: “uint32”, “name”: “initializedTicksCrossed”, “type”: “uint32” }, { “internalType”: “uint256”, “name”: “gasEstimate”, “type”: “uint256” } ], “stateMutability”: “nonpayable”, “type”: “function” }, { “inputs”: [ { “internalType”: “int256”, “name”: “amount0Delta”, “type”: “int256” }, { “internalType”: “int256”, “name”: “amount1Delta”, “type”: “int256” }, { “internalType”: “bytes”, “name”: “path”, “type”: “bytes” } ], “name”: “uniswapV3SwapCallback”, “outputs”: [], “stateMutability”: “view”, “type”: “function” } ]<\/p>\n

const provider = new ethers.JsonRpcProvider(“https:\/\/rpc.o.xyz\/”);
const quoterContract = new ethers.Contract(
QUOTER_CONTRACT_ADDRESS,
QUOTER_ABI,
provider
);
const signer = new ethers.Wallet(process.env.PRIVATE_KEY!, provider);QUOTER_CONTRACT_ADDRESS: Is part of the V3 deployment contractsQUOTER_ABI: Is the abi of the\u00a0contractprovider: Connect to the\u00a0RPCquoterContract: Connect to the quoter\u00a0contractsigner: Connect to your\u00a0wallet<\/p>\n

Params<\/h3>\n

const params = {
tokenIn: “0xc7C3cff325c6976965edfEB05c024584e4e4BBDD”,
tokenOut: “0x91d70c3adde2f0f0c4fb0b2de69f37a7c7e326df”,
fee: 3000,
recipient: signer.address,
deadline: Math.floor(new Date().getTime() \/ 1000 + 60 * 10),
amountIn: ethers.parseUnits(“0.01”),
sqrtPriceLimitX96: 0,
};tokenIn: ERC20 contract address you\u2019re\u00a0spendingtokenOut: ERC20 contract address you\u2019re receivingfee: Are the fee tiers<\/a> 1%, 0.3%, 0.05%, and\u00a00.01%recipient: The receiving addressdeadline: How long the transaction is valid\u00a0foramountIn: Amount (smallest unit) you\u2019re\u00a0spendingsqrtPriceLimitX96: No\u00a0limit<\/p>\n

Raw Transction<\/h3>\n

const transaction = await quoterContract.quoteExactInputSingle.populateTransaction(params);<\/p>\n

Creates a raw transaction to\u00a0sign.<\/p>\n

Output<\/p>\n

{
to: “0x0880484412B5bAa18B3fa2904a500c08f0fE79D2”,
data: “0xc6a5026a000000000000000000000000c7c3cff325c6976965edfeb05c024584e4e4bbdd00000000000000000000000091d70c3adde2f0f0c4fb0b2de69f37a7c7e326df000000000000000000000000000000000000000000000000002386f26fc100000000000000000000000000000000000000000000000000000000000000000bb80000000000000000000000000000000000000000000000000000000000000000”
}<\/p>\n

Send Transaction<\/h3>\n

const receipt = await signer.sendTransaction(transaction);<\/p>\n

Signs and broadcasts the transaction<\/p>\n

Output<\/p>\n

{
receipt: TransactionResponse {
provider: JsonRpcProvider {},
blockNumber: null,
blockHash: null,
index: undefined,
hash: “0x58f4da9449ae4a1eca01a05765e1d54c292d0bcf4935b206cf4747073f2bf3b7”,
type: 2,
to: “0x0880484412B5bAa18B3fa2904a500c08f0fE79D2”,
from: “0xa427305648aD5227098812EdA6FF82D980b2DbBD”,
nonce: 51,
gasLimit: 117236n,
gasPrice: undefined,
maxPriorityFeePerGas: 1000000n,
maxFeePerGas: 1000504n,
maxFeePerBlobGas: null,
data: “0xc6a5026a000000000000000000000000c7c3cff325c6976965edfeb05c024584e4e4bbdd00000000000000000000000091d70c3adde2f0f0c4fb0b2de69f37a7c7e326df000000000000000000000000000000000000000000000000002386f26fc100000000000000000000000000000000000000000000000000000000000000000bb80000000000000000000000000000000000000000000000000000000000000000”,
value: 0n,
chainId: 84841n,
signature: Signature { r: “0xe485ba3893b0543a77a1bb14f0e2661dc7af3f6b2d0b3b917c8fbf4eaa6103c3”, s: “0x15e605c7e1fd6a64f5ca5d3f519c085367ce1250bf7647a6450bf9aef549c98c”, yParity: 0, networkV: null },
accessList: [],
blobVersionedHashes: null
}
}<\/p>\n

Approve Spending (prerequisite)<\/h3>\n

const SWAP_ROUTER_CONTRACT_ADDRESS = ‘0x660C85710a1cd10e8345BB30C80A49f661486007’<\/p>\n

const approveTransaction = await tokenContract.approve.populateTransaction(
SWAP_ROUTER_CONTRACT_ADDRESS,
ethers.parseEther(amount.toString())
);<\/p>\n

Make sure the wallet has approved spending.<\/p>\n

How to Programmatically Swap a V3 DEX<\/a> was originally published in Coinmonks<\/a> on Medium, where people are continuing the conversation by highlighting and responding to this story.<\/p>","protected":false},"excerpt":{"rendered":"

Overview Swaps can be done through a website or programmatically through a standard Uniswap V3 API interface. Below are the requirements Nodejsethersdotenv Below is the full source\u00a0code: import { ethers } from “ethers”;import “dotenv\/config”; const QUOTER_CONTRACT_ADDRESS = “0x0880484412B5bAa18B3fa2904a500c08f0fE79D2”;\/\/ prettier-ignoreconst QUOTER_ABI = [ { “inputs”: [ { “internalType”: “address”, “name”: “_factory”, “type”: “address” }, { “internalType”: […]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[],"class_list":["post-39635","post","type-post","status-publish","format-standard","hentry","category-interesting"],"_links":{"self":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/39635"}],"collection":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=39635"}],"version-history":[{"count":0,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=\/wp\/v2\/posts\/39635\/revisions"}],"wp:attachment":[{"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=39635"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=39635"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mycryptomania.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=39635"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}