curl --request POST \
  --url https://api.parlayx.com/v1/kalshi/orders/{orderId}/amend \
  --header 'Content-Type: application/json' \
  --header 'PX-Content-Sha256: <px-content-sha256>' \
  --header 'PX-Key-Id: <px-key-id>' \
  --header 'PX-Signature: <px-signature>' \
  --header 'PX-Timestamp: <px-timestamp>' \
  --data '
{
  "price": "0.38",
  "count": "10"
}
'

import requests

url = "https://api.parlayx.com/v1/kalshi/orders/{orderId}/amend"

payload = {
    "price": "0.38",
    "count": "10"
}
headers = {
    "PX-Key-Id": "<px-key-id>",
    "PX-Timestamp": "<px-timestamp>",
    "PX-Signature": "<px-signature>",
    "PX-Content-Sha256": "<px-content-sha256>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'PX-Key-Id': '<px-key-id>',
    'PX-Timestamp': '<px-timestamp>',
    'PX-Signature': '<px-signature>',
    'PX-Content-Sha256': '<px-content-sha256>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({price: '0.38', count: '10'})
};

fetch('https://api.parlayx.com/v1/kalshi/orders/{orderId}/amend', 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://api.parlayx.com/v1/kalshi/orders/{orderId}/amend",
  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([
    'price' => '0.38',
    'count' => '10'
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "PX-Content-Sha256: <px-content-sha256>",
    "PX-Key-Id: <px-key-id>",
    "PX-Signature: <px-signature>",
    "PX-Timestamp: <px-timestamp>"
  ],
]);

$response = curl_exec($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://api.parlayx.com/v1/kalshi/orders/{orderId}/amend"

	payload := strings.NewReader("{\n  \"price\": \"0.38\",\n  \"count\": \"10\"\n}")

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

	req.Header.Add("PX-Key-Id", "<px-key-id>")
	req.Header.Add("PX-Timestamp", "<px-timestamp>")
	req.Header.Add("PX-Signature", "<px-signature>")
	req.Header.Add("PX-Content-Sha256", "<px-content-sha256>")
	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://api.parlayx.com/v1/kalshi/orders/{orderId}/amend")
  .header("PX-Key-Id", "<px-key-id>")
  .header("PX-Timestamp", "<px-timestamp>")
  .header("PX-Signature", "<px-signature>")
  .header("PX-Content-Sha256", "<px-content-sha256>")
  .header("Content-Type", "application/json")
  .body("{\n  \"price\": \"0.38\",\n  \"count\": \"10\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.parlayx.com/v1/kalshi/orders/{orderId}/amend")

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

request = Net::HTTP::Post.new(url)
request["PX-Key-Id"] = '<px-key-id>'
request["PX-Timestamp"] = '<px-timestamp>'
request["PX-Signature"] = '<px-signature>'
request["PX-Content-Sha256"] = '<px-content-sha256>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"price\": \"0.38\",\n  \"count\": \"10\"\n}"

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

{
  "order": {
    "orderId": "3f8b2c9a-2d18-4f7e-9c2a-1b6e1f0c8a4d",
    "ticker": "KXPRES-2028",
    "side": "BID",
    "type": "LIMIT",
    "count": "10",
    "yesPrice": "<string>",
    "noPrice": "<string>",
    "outcomeSide": "YES",
    "price": "0.38",
    "postOnly": false,
    "status": "OPEN",
    "venueOrderId": "b4d9e1f2-3a6c-4d8e-9f1a-2b3c4d5e6f70",
    "createdAt": "2026-07-26T12:00:00.000Z",
    "updatedAt": "2026-07-26T12:05:00.000Z",
    "filledCount": "4",
    "averageYesPrice": "<string>",
    "averageNoPrice": "<string>",
    "averagePrice": "0.3725",
    "feesCents": 6,
    "feesUsd": "0.063000",
    "closedAt": "2026-07-26T12:10:00.000Z",
    "clientOrderId": "order-1",
    "queuePosition": "<string>"
  },
  "previous": {
    "price": "0.37",
    "count": "8"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "<string>",
    "orderId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "<string>"
  }
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "<string>"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "<string>",
    "orderId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "<string>",
    "orderId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "UNAUTHORIZED",
    "message": "<string>"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "<string>",
    "orderId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}

{
  "error": {
    "code": "INVALID_REQUEST",
    "message": "<string>",
    "orderId": "3c90c3cc-0d44-4b50-8888-8dd25736052a"
  }
}