# Submit order by Kaspa ### Header

Fields	Description
Address	The current address of the user's connected kaspa wallet.
PublicKey	The publicKey of the current address.
Chain	Required. KAS
Signature	The user's signature of the post body

### Body

Fields	Description
sourceCerts	The hex string of the transaction data.
orderType	Transaction type. • orderType: 1 represents cross-chain. • orderType: 2 represents Aggregate.
toIndex	The index value of the token used in the transaction within our system.
toChain	The nickName value of the Chain used in the transaction within our system.
toAddr	The target user’s address for this transaction.
slippage	The slippage information for this transaction. This value is in ten-thousandths, e.g., 10 (0.1%). When orderType = 1, the slippage is always 0.
execStrategy	Reserved field, pass an empty string by default.
extra	Transaction verification information; the accuracy of this value determines whether the transaction can be successful.
triggerPrice	Reserved field, pass "0" by default.
timeout	Reserved field, pass "0" by default.
channel	chainge

**sourceCerts**

Fields	Description
fromAmount	Transaction quantity.
fromIndex	The index value of the token used in the transaction within our system.
fromChain	The nickName value of the Chain used in the transaction within our system.
fromAddr	The current address of the user's connected kaspa wallet.
certHash	Transaction hash.
fromPublicKey	The publicKey of the current address.
signature	"123456"

example: This example is for demonstration purposes only.

import BigNumber from 'bignumber.js';
import { formatUnits, hexlify, parseUnits, toUtf8Bytes } from 'ethers'
import { getAggregateQuote,  getChain } from '../api.js';

const fromAddress = 'kaspa:qzg4g46sd3hnax9fnjqdc2jfljs39f9ng00ntfhdz28rfwyc8adzuksnutgrq'
const toAddress = 'kaspa:qzg4g46sd3hnax9fnjqdc2jfljs39f9ng00ntfhdz28rfwyc8adzuksnutgrq'
const publicKey = '03915457506c6f3e98a99c80dc2a49fca112a4b343df35a6ed128e34b8983f5a2e'
const wallet = {} // The kasWare wallet object.

const channelFeeRate = '0'
// This information can be obtained through the getAssets APIs.
const fromTokenForKAS = {
    index: '18',
    symbol: 'KAS',
    decimals: 8,
    address: '0xeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee'
}

const toTokenForKAS = {
    index: '103',
    symbol: 'PEPE',
    decimals: 8,
    address: 'PEPE'
}

// init base data
let supportChainList = []
const initData = async() => {
    const chains = await getChain()
    supportChainList = chains
}


const fromAmount = '100'
const amount = parseUnits(fromAmount, fromTokenForKAS.decimals).toString()
let extra = ''
let customSlippage = '5' // percentage format, ex: 5%
let toExpectAmount = ''

const fnGetAggregateQuote = async () => {
    const quoteParams = {
        fromAmount: amount,
        fromTokenAddress: fromTokenForKAS.address,
        fromDecimal: fromTokenForKAS.decimals,
        fromChain: 'KAS',
        toTokenAddress: toTokenForKAS.address,
        toDecimal: toTokenForKAS.decimals,
        toChain: 'KAS',
        channelFeeRate: channelFeeRate,
    }

    // quote 
    const quoteResult = await getAggregateQuote(quoteParams)
    if(quoteResult.code !== 0) return
    const { chain, chainDecimal, outAmount, serviceFee, gasFee, slippage } = quoteResult.data

    const receiveAmount = BigInt(outAmount) - BigInt(serviceFee) - BigInt(gasFee)
    if(receiveAmount <= BigInt(0)) {
        // The current quote amount cannot cover the fees. Please enter a larger amount.
        return
    }

    // execution Chain Info
    const executionChainObj = supportChainList.find((item) => item.network === chain)

    // Calculate the value the user should receive. 
    const receiveAmountHr = formatUnits(receiveAmount, chainDecimal)
    const receiveAmountForExtra = parseUnits(receiveAmountHr, toTokenForKAS.decimals).toString()


    // Computed minimum, After calculating the minimum value, we need to convert it to the decimals of the target chain.
    // The slippage here is in percentage format. 
    // The slippage returned by this interface is our recommended value, but you can set your own slippage.
    const tempSlippage = customSlippage || slippage
    const miniAmount = BigNumber(receiveAmountHr).multipliedBy(BigNumber((1 - (tempSlippage * 0.01)))).toFixed(toTokenForKAS.decimals)
    const miniAmountForExtra = parseUnits(miniAmount, toTokenForKAS.decimals).toString()

    // 1_Expected value;2_Third party profit ratio;3_version;4_Mini Amount;5_Execution chain
    extra = `1_${receiveAmountForExtra};2_${channelFeeRate};3_2;4_${miniAmountForExtra};5_${executionChainObj.nickName}`
    customSlippage = tempSlippage
    toExpectAmount = receiveAmountForExtra
}

const fnSubmitOrder = async (tradeHash) => {
    const sourceCertsObj = {
        fromAmount: amount,
        fromIndex: fromTokenForKAS.index.toString(),
        fromChain: 'KAS',    
        fromAddr: fromAddress,
        certHash: tradeHash,
        fromPublicKey: publicKey,
        signature: "123456",
    };
    const sourceCertsStr = JSON.stringify(sourceCertsObj);
    let sourceCertsHex = hexlify(toUtf8Bytes(sourceCertsStr));
    sourceCertsHex = sourceCertsHex.substring(2);

    // The slippage here needs to be converted to basis points (1/10,000).
    let slippageNumBI = BigNumber(customSlippage)
    const formatSlippage = slippageNumBI.multipliedBy(BigNumber(100)).toFixed(0)
    const params = {
        "sourceCerts": sourceCertsHex,
        "orderType": "2",
        "toIndex": toTokenForKAS.index.toString(),
        "toChain": "KAS",
        "toAddr": toAddress,
        "slippage": formatSlippage,
        "execStrategy": "",
        "extra": extra,
        "triggerPrice": "0",
        "timeout": "0",
        "channel": "chainge" // your channel
    }
    let raw = `${sourceCertsObj.certHash}_${sourceCertsObj.fromChain}_${sourceCertsObj.fromIndex}_${sourceCertsObj.fromAmount}_${params.toChain}_${params.toIndex}_${toExpectAmount}_${params.toAddr}`

    // Use the signMessage method of the kasWare wallet to sign a string.
    // let signature = wallet.signMessage(raw)
    let signature = ''

    const header = {
        Address: fromAddress,
        PublicKey: publicKey,
        Chain: 'KAS',
        Signature: signature
    }

    const response = await fetch('https://api2.chainge.finance/v1/submitOrder', {
        method: "POST",
        headers: {
             "Content-Type": "application/json",
             ...header
        },
        body: JSON.stringify(params)
    })
    const result = await response.json()
}


const fnCore = async () => {
    // step 1: init base data
    await initData()

    // step 2: quote 
    await fnGetAggregateQuote()

    // step 3: Send transaction 
    // You need to initiate a transaction to our minter through the wallet, and obtain the hash. This hash will be the transaction hash.
    // const txHash = await wallet.signKRC20Transaction()
    const txHash = ''

    // step 4: submitOrder
    await fnSubmitOrder(txHash)
}

fnCore()

> ***NOTE:***\ > We have three minter addresses; make sure to distinguish between them when using them. > > *KAS TOKEN:* > > kaspa:qpgmt2dn8wcqf0436n0kueap7yx82n7raurlj6aqjc3t3wm9y5ssqtg9e4lsm > > *CUSDT/CUSDC/CETH/CBTC/CXCHNG TOKEN:*\ > kaspa:qpy03sxk3z22pacz2vkn2nrqeglvptugyqy54xal2skha6xh0cr7wjueueg79\ > \&#xNAN;*KRC20 TOKEN:*\ > kaspa:qz9cqmddjppjyth8rngevfs767m5nvm0480nlgs5ve8d6aegv4g9xzu2tgg0u