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In this guide, we will walk through the process of placing a limit order on Kyberswap using their API. Kyberswap is a decentralized exchange (DEX) aggregator that provides the best token prices by aggregating liquidity from various DEXs. By leveraging Kyberswap's API, we can automate the process of placing limit orders for token trades, giving you full control over your trade price. This tutorial will guide you through setting up the necessary environment, writing the code to interact with the Kyberswap API, and successfully placing a limit order using Node.js and the appropriate dependencies. For more about DEX, visit crypto exchange development services.What is a limit order?A limit order is an instruction to buy or sell your token at a specific price or better. It gives control over the trade price to be executed.For example:A buy limit order will only execute at the limit price. And a sell limit order will only execute at the limit price or higher.Also Read | Ethereum Smart Contracts: Best Use CasesWhat is Kyberswap?A dex aggregator & liquidity protocol that provides the best token price by aggregating liquidity from various DEXs. It also provides liquidity providers with opportunities to earn rewards by depositing their tokens.Before everything, you must have Node.js and VS Code installed.Let's set up this:Open your terminal and type this command: 1. mkdir KyberswapApi 2. cd KyberswapApi 3. code .It will open your project KyberswapApi in VS Code, then open the terminal in VS Code and type this command: npm init It will initialize a project and create the package.json file. npm install viem ethers axios It will install all dependencies in your package.json file.Create a file index.js and paste this ProgramRun this command in your terminal : node index.js (this will create the limit order successfully).Also, Read | A Dev Guide to Placing Orders using Hyperliquid APIHow to use Kyberswap Api to place a limit orderTo create a new order, we need to make a post request on this URL: https://limit-order.kyberswap.com/write/api/v1/ordersFor this, we need params which include the signed EIP712 message and returned data from this post request(https://limit-order.kyberswap.com/write/api/v1/orders/sign-message).Program : import { createWalletClient, erc20Abi, parseEther, getContract, createPublicClient, http, encodeFunctionData } from "viem"; import { ethers } from "ethers"; import axios from "axios"; import { privateKeyToAccount } from 'viem/accounts'; import { base } from 'viem/chains'; const kyberApiUrl = "https://limit-order.kyberswap.com"; const privateKey = "000000X4PRivateKey"; const rpcUrl = "https://mainnet.base.org"; async function mainApprove(makerAsset, limitOrderContract, maker, makingAmount) { const client = createPublicClient({ chain: { id: 8453, // Base chain ID name: "Base", rpcUrls: { default: { http: ["https://mainnet.base.org"] }, }, }, transport: http("https://mainnet.base.org") }); console.log("Client created for Base chain:", client); const tokenContract = getContract({ abi: erc20Abi, address: makerAsset, client: client, }); console.log("here is the tokenContract",tokenContract.address); const currentAllowance = await tokenContract.read.allowance([ maker, limitOrderContract, ]); console.log("Current Allowance:", currentAllowance.toString()); const encodedCalls = []; if (BigInt(currentAllowance) < BigInt('100000000')) { console.log("here it comes "); const approvalData =await getTokenApprovalCalldata( makerAsset, limitOrderContract, makingAmount, ); console.log(' Approval Data:', approvalData); encodedCalls.push({ to: makerAsset , data: approvalData, // gas: '0.007547422' //approvalGas.toString(), }); console.log("Encoded Calls:", encodedCalls); const swaptx = encodedCalls; const str = "000000X4PRivateKey"; const account = privateKeyToAccount(`0x${str}`); const walletClient = createWalletClient({ account, chain: base, transport: http('https://mainnet.base.org'), }); console.log("Wallet Client created:"); const tx1=[]; for (const call of swaptx) { const tx = { to: call.to, data: call.data, value: call.value ? BigInt(call.value) : 0n, }; const hash = await walletClient.sendTransaction(tx); tx1.push(hash); console.log(' Transaction sent, hash:', hash); } return tx1; } return ""; } async function postCreateOrderUnsigned( chainId, makerAsset, takerAsset, maker, //Maker address makingAmount, // "10000" takingAmount // "20000000000000000" ) { let targetPath = `/write/api/v1/orders/sign-message`; // Structure the request to be sent in POST body const requestBody = { chainId: chainId.toString(), makerAsset: makerAsset, // USDC takerAsset: takerAsset, // KNC maker: maker, allowedSenders: [maker], // Included so that only our account can fill this order makingAmount: makingAmount, takingAmount: takingAmount, expiredAt: Math.floor(Date.now() / 1000) + 60 * 60, // 60mins }; console.debug(requestBody); try { const { data } = await axios.post(kyberApiUrl + targetPath, requestBody); // Return the request used and the EIP712 unsigned data console.log("the data we have",data); return { routerContract: data.data.domain.verifyingContract, requestBody: requestBody, returnedData: data.data, }; } catch (error) { throw error; } } //Get Maker Active Making Amount async function getMakerActiveAmount(chainId, makerAsset, makerAddress) { const targetPath = `/read-ks/api/v1/orders/active-making-amount`; const targetPathConfig = { params: { chainId: chainId, makerAsset: makerAsset, maker: makerAddress, }, }; try { const { data } = await axios.get( kyberApiUrl + targetPath, targetPathConfig ); return data.data.activeMakingAmount; } catch (error) { throw error; } } async function getContracts(chainId) { const targetPath = `/read-ks/api/v1/configs/contract-address`; // Specify the chainId to query const targetPathConfig = { params: { chainId: chainId.toString(), }, }; try { console.log(`\nGetting the LO contracts...`); const { data } = await axios.get( kyberApiUrl + targetPath, targetPathConfig ); return data.data; } catch (error) { throw error; } } // Request approval with calldata sending to the user server (client-side) async function getTokenApprovalCalldata( tokenContractAddress, spenderAddress, amount ) { const data = encodeFunctionData({ abi: erc20Abi, functionName: "approve", args: [spenderAddress, parseEther(amount.toString())], }); //TODO: Send the calldata to the user server here return data; } async function signOrderData(domain, types, message) { const provider = new ethers.JsonRpcProvider(rpcUrl); const signer = new ethers.Wallet(privateKey, provider); return await signer.signTypedData(domain, types, message); } // Create New Order on Kyberswap async function postCreateOrder( chainId, makerAsset, takerAsset, maker, makingAmount, takingAmount ) { const targetPath = `/write/api/v1/orders`; const unsignedOrder = await postCreateOrderUnsigned( chainId, makerAsset, takerAsset, maker, makingAmount, takingAmount ); // Get the request body and the EIP712 order creation data const unsignedOrderReqBody = unsignedOrder.requestBody; const unsignedOrderReturnData = unsignedOrder.returnedData; const routerContract = unsignedOrder.routerContract; // Get the Maker current making amount to ensure contract has sufficient allowance across all orders const currentMakingAmount = await getMakerActiveAmount( chainId, makerAsset, maker ); const newMakingAmount = Number(currentMakingAmount) + Number(unsignedOrderReqBody.makingAmount); // Get the LO contract address to interact with on-chain const limitOrderContract = (await getContracts(chainId)).latest; // Check if LO contract has sufficient allowance to spend makerAsset await getTokenApprovalCalldata( makerAsset, limitOrderContract, newMakingAmount ); const swaptx= await mainApprove( makerAsset, limitOrderContract, maker, newMakingAmount ) console.log("the swaptx is: ",swaptx); // Sign the EIP712 order creation with the user server (client-side) const signature = await signOrderData( unsignedOrderReturnData.domain, { Order: unsignedOrderReturnData.types.Order }, unsignedOrderReturnData.message ); // Structure the request to be sent in POST body const requestBody = { ...unsignedOrderReqBody, salt: unsignedOrderReturnData.message.salt, signature: signature, }; console.log("the request body is: ", requestBody); try { console.log(`\nPosting the create order...`); const { data } = await axios.post(kyberApiUrl + targetPath, requestBody); console.log(`KyberSwap server response:`); console.log(data); } catch (error) { throw error; } }Call the post createOrder function with its parameters, and your order will be created.For example : postCreateOrder( "8453", // chainId "0x50c5725949A6F0c72E6C4a641F24049A917DB0Cb", // maker asset "0x833589fcd6edb6e08f4c7c32d4f71b54bda02913", // taker asset "0x1AC9b76006BaF4f06563E491d4182C82792D2A2C", // maker address "5000000", // making amount "5000000" // taking amount );You may also like | Building a Portfolio Tracker Dashboard Using Hyperliquid APIConclusion:In conclusion, this guide demonstrates how to place a limit order on Kyberswap using the API, allowing you to efficiently manage trades with full control over your order price. By following the steps to set up your environment, configure your wallet, and interact with the Kyberswap API, you can easily integrate limit orders into your trading strategies. With the right parameters and authentication, you can securely create orders on Kyberswap and take advantage of the liquidity available. This process enables developers to enhance their algorithmic trading systems and automate transactions effectively on the platform. For more information, refer to the Kyberswap API documentation.In case you are planning to build a DEX aggregator like Kyberswap, connect with our skilled blockchain developers to get started.

One of the most popular blockchain systems, Ethereum, enables token trading, smart contract development, and the development of decentralised apps (DApps). Retrieving transaction history for a specific address is a crucial component of any blockchain. Web3.py is a well-liked Python toolkit for Ethereum developers to communicate with the Ethereum blockchain. We'll demonstrate how to use Web3.py to retrieve Ethereum transaction history in this blog post.What is Web3.py?Web3.py is a Python library that enables interaction with the Ethereum blockchain. It enables developers to send transactions, communicate with smart contracts, query the blockchain, and much more. Web3.py is frequently used in Ethereum-based DApps and blockchain development to facilitate blockchain interactions using Python.Why Fetch Transaction History?One essential function of any blockchain explorer, wallet app, or DApp is the ability to retrieve transaction history. Obtaining transaction information allows you to:Track and monitor transactions.Obtain details about tokens sent or received.Examine an address's activity for reporting or auditing needs.Also, check | Develop a Multi-Token Crypto Wallet for Ethereum with Web3.jsSteps to Fetch Ethereum Transaction History1. Set Up Web3.py:Installing Web3.py and configuring the connection to an Ethereum node pip install web32. Connecting to the Ethereum Network:Web3.py must be connected to an Ethereum node in order to communicate with the Ethereum blockchain. Infura is a popular solution for this, offering an Ethereum access API. For this, you will want an Infura project ID.Also, Discover | Developing Cross-Platform Crypto Wallet with Web3.js & React from web3 import Web3 infura_url = 'https://mainnet.infura.io/v3/your infura api key' web3 = Web3(Web3.HTTPProvider(infura_url)) # Check if connected if web3.is_connected(): print("Connected to Ethereum Network") else: print("Failed to connect to Ethereum Network")3. Fetch Transaction History:def get_transaction_history(address, start_block=0, end_block='latest'): address = web3.to_checksum_address(address) # Ensure address is in checksum format transactions = [] # Define block range end_block = web3.eth.block_number if end_block == 'latest' else int(end_block) # Loop through blocks and fetch transactions for block_number in range(start_block, end_block + 1): block = web3.eth.get_block(block_number, full_transactions=True) print(f"Processing block {block_number}") if block and block.transactions: for txn in block.transactions: # Check if the transaction involves the target address if txn['to'] == address or txn['from'] == address: transactions.append(txn) return transactions # Replace with the address you're querying transactions = get_transaction_history('0xYourEthereumAddressHere', start_block=10000000, end_block=str(10001000)) # Display transaction details for txn in transactions: print(f"Transaction Hash: {txn['hash'].hex()}") print(f"From: {txn['from']}") print(f"To: {txn['to']}") print(f"Amount: {web3.from_wei(txn['value'], 'ether')} ETH") print(f"Block Number: {txn['blockNumber']}") print(f"Gas Used: {txn['gas']}") print('---')Output:  Environment updated. Reloading shell... Connected to Ethereum Network Processing block 21873279 Processing block 21873280 Processing block 21873281 Processing block 21873282 Processing block 21873283 Processing block 21873284 Transaction Hash: 650b635c2687df8103a3df0ede497e0ff12fb3041494adf031debc7b61e8223c From: 0x8D9903956d0C9bE104E4Ed32852080F86cfCadcF To: 0x66a9893cC07D91D95644AEDD05D03f95e1dBA8Af Amount: 0 ETH Block Number: 21873279 Gas Used: 351949 ---Also Read | Ethereum Smart Contracts: Best Use CasesConclusionFetching Ethereum transaction history using Web3.py empowers developers to build robust blockchain applications with transparency and accountability. Whether you're developing a wallet, an audit tool, or an analytics dashboard, accessing historical transaction data is key to understanding user behavior, ensuring compliance, and enabling seamless experiences. With just a few lines of Python and a connection to an Ethereum node like Infura, you can easily retrieve and analyze on-chain activity, making Web3.py an essential tool in every Ethereum developer's toolkit.If you're looking to build or scale blockchain solutions, feel free to connect with our experienced blockchain developers for tailored development support.