curl --request POST \
  --url https://swap-api.flux.fun/v1/order/calldata \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "orderType": "MarketOrder",
  "order": {
    "quoteToken": {
      "type": "kalshi",
      "data": {
        "marketId": "KXBTC-24NOV30-T65000",
        "side": "yes"
      }
    },
    "baseToken": {
      "type": "kalshi",
      "data": {
        "marketId": "KXBTC-24NOV30-T65000",
        "side": "yes"
      }
    },
    "orderType": "BUY",
    "baseQuantity": "100",
    "minQuoteQuantityOut": "95",
    "maxQuoteQuantityIn": "105"
  },
  "chainId": 8453,
  "clientId": "order-123",
  "includeTokenTransfer": false,
  "userAddress": "0x...",
  "receiverAddress": "0x..."
}
'

import requests

url = "https://swap-api.flux.fun/v1/order/calldata"

payload = {
    "orderType": "MarketOrder",
    "order": {
        "quoteToken": {
            "type": "kalshi",
            "data": {
                "marketId": "KXBTC-24NOV30-T65000",
                "side": "yes"
            }
        },
        "baseToken": {
            "type": "kalshi",
            "data": {
                "marketId": "KXBTC-24NOV30-T65000",
                "side": "yes"
            }
        },
        "orderType": "BUY",
        "baseQuantity": "100",
        "minQuoteQuantityOut": "95",
        "maxQuoteQuantityIn": "105"
    },
    "chainId": 8453,
    "clientId": "order-123",
    "includeTokenTransfer": False,
    "userAddress": "0x...",
    "receiverAddress": "0x..."
}
headers = {
    "x-api-key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'x-api-key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    orderType: 'MarketOrder',
    order: {
      quoteToken: {type: 'kalshi', data: {marketId: 'KXBTC-24NOV30-T65000', side: 'yes'}},
      baseToken: {type: 'kalshi', data: {marketId: 'KXBTC-24NOV30-T65000', side: 'yes'}},
      orderType: 'BUY',
      baseQuantity: '100',
      minQuoteQuantityOut: '95',
      maxQuoteQuantityIn: '105'
    },
    chainId: 8453,
    clientId: 'order-123',
    includeTokenTransfer: false,
    userAddress: '0x...',
    receiverAddress: '0x...'
  })
};

fetch('https://swap-api.flux.fun/v1/order/calldata', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://swap-api.flux.fun/v1/order/calldata",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'orderType' => 'MarketOrder',
    'order' => [
        'quoteToken' => [
                'type' => 'kalshi',
                'data' => [
                                'marketId' => 'KXBTC-24NOV30-T65000',
                                'side' => 'yes'
                ]
        ],
        'baseToken' => [
                'type' => 'kalshi',
                'data' => [
                                'marketId' => 'KXBTC-24NOV30-T65000',
                                'side' => 'yes'
                ]
        ],
        'orderType' => 'BUY',
        'baseQuantity' => '100',
        'minQuoteQuantityOut' => '95',
        'maxQuoteQuantityIn' => '105'
    ],
    'chainId' => 8453,
    'clientId' => 'order-123',
    'includeTokenTransfer' => false,
    'userAddress' => '0x...',
    'receiverAddress' => '0x...'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "x-api-key: <api-key>"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://swap-api.flux.fun/v1/order/calldata"

	payload := strings.NewReader("{\n  \"orderType\": \"MarketOrder\",\n  \"order\": {\n    \"quoteToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"baseToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"orderType\": \"BUY\",\n    \"baseQuantity\": \"100\",\n    \"minQuoteQuantityOut\": \"95\",\n    \"maxQuoteQuantityIn\": \"105\"\n  },\n  \"chainId\": 8453,\n  \"clientId\": \"order-123\",\n  \"includeTokenTransfer\": false,\n  \"userAddress\": \"0x...\",\n  \"receiverAddress\": \"0x...\"\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("x-api-key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://swap-api.flux.fun/v1/order/calldata")
  .header("x-api-key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"orderType\": \"MarketOrder\",\n  \"order\": {\n    \"quoteToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"baseToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"orderType\": \"BUY\",\n    \"baseQuantity\": \"100\",\n    \"minQuoteQuantityOut\": \"95\",\n    \"maxQuoteQuantityIn\": \"105\"\n  },\n  \"chainId\": 8453,\n  \"clientId\": \"order-123\",\n  \"includeTokenTransfer\": false,\n  \"userAddress\": \"0x...\",\n  \"receiverAddress\": \"0x...\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://swap-api.flux.fun/v1/order/calldata")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request["x-api-key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"orderType\": \"MarketOrder\",\n  \"order\": {\n    \"quoteToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"baseToken\": {\n      \"type\": \"kalshi\",\n      \"data\": {\n        \"marketId\": \"KXBTC-24NOV30-T65000\",\n        \"side\": \"yes\"\n      }\n    },\n    \"orderType\": \"BUY\",\n    \"baseQuantity\": \"100\",\n    \"minQuoteQuantityOut\": \"95\",\n    \"maxQuoteQuantityIn\": \"105\"\n  },\n  \"chainId\": 8453,\n  \"clientId\": \"order-123\",\n  \"includeTokenTransfer\": false,\n  \"userAddress\": \"0x...\",\n  \"receiverAddress\": \"0x...\"\n}"

response = http.request(request)
puts response.read_body

{
  "success": true,
  "transactions": [
    {
      "to": "0x1234567890abcdef1234567890abcdef12345678",
      "value": "0",
      "data": "0x1234567890abcdef..."
    }
  ],
  "description": "Submit order for BTC-100K market"
}