curl --request POST \
  --url https://api.prod.polymarketexchange.com/v1/trading/orders/preview \
  --header 'Content-Type: application/json' \
  --data '
{
  "request": {
    "orderQty": "<string>",
    "symbol": "<string>",
    "price": "<string>",
    "clordId": "<string>",
    "account": "<string>",
    "stopPrice": "<string>",
    "minQty": "<string>",
    "selfMatchPreventionId": "<string>",
    "quote": "<string>",
    "allOrNone": true,
    "sessionId": "<string>",
    "user": "<string>",
    "clientAccountId": "<string>",
    "clientParticipantId": "<string>",
    "participateDontInitiate": true,
    "cashOrderQty": "<string>",
    "strictLimit": true,
    "goodTillTime": "2023-11-07T05:31:56Z",
    "bestLimit": true,
    "immediatelyExecutableLimit": true,
    "ignorePriceValidityChecks": true
  }
}
'

import requests

url = "https://api.prod.polymarketexchange.com/v1/trading/orders/preview"

payload = { "request": {
        "orderQty": "<string>",
        "symbol": "<string>",
        "price": "<string>",
        "clordId": "<string>",
        "account": "<string>",
        "stopPrice": "<string>",
        "minQty": "<string>",
        "selfMatchPreventionId": "<string>",
        "quote": "<string>",
        "allOrNone": True,
        "sessionId": "<string>",
        "user": "<string>",
        "clientAccountId": "<string>",
        "clientParticipantId": "<string>",
        "participateDontInitiate": True,
        "cashOrderQty": "<string>",
        "strictLimit": True,
        "goodTillTime": "2023-11-07T05:31:56Z",
        "bestLimit": True,
        "immediatelyExecutableLimit": True,
        "ignorePriceValidityChecks": True
    } }
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    request: {
      orderQty: '<string>',
      symbol: '<string>',
      price: '<string>',
      clordId: '<string>',
      account: '<string>',
      stopPrice: '<string>',
      minQty: '<string>',
      selfMatchPreventionId: '<string>',
      quote: '<string>',
      allOrNone: true,
      sessionId: '<string>',
      user: '<string>',
      clientAccountId: '<string>',
      clientParticipantId: '<string>',
      participateDontInitiate: true,
      cashOrderQty: '<string>',
      strictLimit: true,
      goodTillTime: '2023-11-07T05:31:56Z',
      bestLimit: true,
      immediatelyExecutableLimit: true,
      ignorePriceValidityChecks: true
    }
  })
};

fetch('https://api.prod.polymarketexchange.com/v1/trading/orders/preview', 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.prod.polymarketexchange.com/v1/trading/orders/preview",
  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([
    'request' => [
        'orderQty' => '<string>',
        'symbol' => '<string>',
        'price' => '<string>',
        'clordId' => '<string>',
        'account' => '<string>',
        'stopPrice' => '<string>',
        'minQty' => '<string>',
        'selfMatchPreventionId' => '<string>',
        'quote' => '<string>',
        'allOrNone' => true,
        'sessionId' => '<string>',
        'user' => '<string>',
        'clientAccountId' => '<string>',
        'clientParticipantId' => '<string>',
        'participateDontInitiate' => true,
        'cashOrderQty' => '<string>',
        'strictLimit' => true,
        'goodTillTime' => '2023-11-07T05:31:56Z',
        'bestLimit' => true,
        'immediatelyExecutableLimit' => true,
        'ignorePriceValidityChecks' => true
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.prod.polymarketexchange.com/v1/trading/orders/preview"

	payload := strings.NewReader("{\n  \"request\": {\n    \"orderQty\": \"<string>\",\n    \"symbol\": \"<string>\",\n    \"price\": \"<string>\",\n    \"clordId\": \"<string>\",\n    \"account\": \"<string>\",\n    \"stopPrice\": \"<string>\",\n    \"minQty\": \"<string>\",\n    \"selfMatchPreventionId\": \"<string>\",\n    \"quote\": \"<string>\",\n    \"allOrNone\": true,\n    \"sessionId\": \"<string>\",\n    \"user\": \"<string>\",\n    \"clientAccountId\": \"<string>\",\n    \"clientParticipantId\": \"<string>\",\n    \"participateDontInitiate\": true,\n    \"cashOrderQty\": \"<string>\",\n    \"strictLimit\": true,\n    \"goodTillTime\": \"2023-11-07T05:31:56Z\",\n    \"bestLimit\": true,\n    \"immediatelyExecutableLimit\": true,\n    \"ignorePriceValidityChecks\": true\n  }\n}")

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

	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.prod.polymarketexchange.com/v1/trading/orders/preview")
  .header("Content-Type", "application/json")
  .body("{\n  \"request\": {\n    \"orderQty\": \"<string>\",\n    \"symbol\": \"<string>\",\n    \"price\": \"<string>\",\n    \"clordId\": \"<string>\",\n    \"account\": \"<string>\",\n    \"stopPrice\": \"<string>\",\n    \"minQty\": \"<string>\",\n    \"selfMatchPreventionId\": \"<string>\",\n    \"quote\": \"<string>\",\n    \"allOrNone\": true,\n    \"sessionId\": \"<string>\",\n    \"user\": \"<string>\",\n    \"clientAccountId\": \"<string>\",\n    \"clientParticipantId\": \"<string>\",\n    \"participateDontInitiate\": true,\n    \"cashOrderQty\": \"<string>\",\n    \"strictLimit\": true,\n    \"goodTillTime\": \"2023-11-07T05:31:56Z\",\n    \"bestLimit\": true,\n    \"immediatelyExecutableLimit\": true,\n    \"ignorePriceValidityChecks\": true\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.prod.polymarketexchange.com/v1/trading/orders/preview")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"request\": {\n    \"orderQty\": \"<string>\",\n    \"symbol\": \"<string>\",\n    \"price\": \"<string>\",\n    \"clordId\": \"<string>\",\n    \"account\": \"<string>\",\n    \"stopPrice\": \"<string>\",\n    \"minQty\": \"<string>\",\n    \"selfMatchPreventionId\": \"<string>\",\n    \"quote\": \"<string>\",\n    \"allOrNone\": true,\n    \"sessionId\": \"<string>\",\n    \"user\": \"<string>\",\n    \"clientAccountId\": \"<string>\",\n    \"clientParticipantId\": \"<string>\",\n    \"participateDontInitiate\": true,\n    \"cashOrderQty\": \"<string>\",\n    \"strictLimit\": true,\n    \"goodTillTime\": \"2023-11-07T05:31:56Z\",\n    \"bestLimit\": true,\n    \"immediatelyExecutableLimit\": true,\n    \"ignorePriceValidityChecks\": true\n  }\n}"

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

{
  "previewOrder": {
    "id": "<string>",
    "orderQty": "<string>",
    "symbol": "<string>",
    "clordId": "<string>",
    "account": "<string>",
    "cumQty": "<string>",
    "avgPx": "<string>",
    "leavesQty": "<string>",
    "participant": "<string>",
    "price": "<string>",
    "insertTime": "2023-11-07T05:31:56Z",
    "stopPrice": "<string>",
    "minQty": "<string>",
    "createTime": "2023-11-07T05:31:56Z",
    "allOrNone": true,
    "crossId": "<string>",
    "hostCrossId": "<string>",
    "submittingParticipant": "<string>",
    "clientAccountId": "<string>",
    "clientParticipantId": "<string>",
    "parentOrderId": "<string>",
    "commissionsBasisPoints": "<string>",
    "participateDontInitiate": true,
    "cashOrderQty": "<string>",
    "strictLimit": true,
    "goodTillTime": "2023-11-07T05:31:56Z",
    "bestLimit": true,
    "immediatelyExecutableLimit": true,
    "lastTradeId": "<string>",
    "commissionNotionalTotalCollected": "<string>",
    "ignorePriceValidityChecks": true,
    "lastTransactTime": "2023-11-07T05:31:56Z",
    "makerCommissionsBasisPoints": "<string>",
    "fractionalQuantityScale": "<string>",
    "priceToQuantityFilled": {}
  }
}