curl --request POST \
  --url https://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker} \
  --header 'Content-Type: application/json' \
  --header 'KALSHI-ACCESS-KEY: <api-key>' \
  --header 'KALSHI-ACCESS-SIGNATURE: <api-key>' \
  --header 'KALSHI-ACCESS-TIMESTAMP: <api-key>' \
  --data '
{
  "selected_markets": [
    {
      "market_ticker": "<string>",
      "event_ticker": "<string>"
    }
  ],
  "with_market_payload": true
}
'

import requests

url = "https://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}"

payload = {
    "selected_markets": [
        {
            "market_ticker": "<string>",
            "event_ticker": "<string>"
        }
    ],
    "with_market_payload": True
}
headers = {
    "KALSHI-ACCESS-KEY": "<api-key>",
    "KALSHI-ACCESS-SIGNATURE": "<api-key>",
    "KALSHI-ACCESS-TIMESTAMP": "<api-key>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {
    'KALSHI-ACCESS-KEY': '<api-key>',
    'KALSHI-ACCESS-SIGNATURE': '<api-key>',
    'KALSHI-ACCESS-TIMESTAMP': '<api-key>',
    'Content-Type': 'application/json'
  },
  body: JSON.stringify({
    selected_markets: [{market_ticker: '<string>', event_ticker: '<string>'}],
    with_market_payload: true
  })
};

fetch('https://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}', 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://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}",
  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([
    'selected_markets' => [
        [
                'market_ticker' => '<string>',
                'event_ticker' => '<string>'
        ]
    ],
    'with_market_payload' => true
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "KALSHI-ACCESS-KEY: <api-key>",
    "KALSHI-ACCESS-SIGNATURE: <api-key>",
    "KALSHI-ACCESS-TIMESTAMP: <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://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}"

	payload := strings.NewReader("{\n  \"selected_markets\": [\n    {\n      \"market_ticker\": \"<string>\",\n      \"event_ticker\": \"<string>\"\n    }\n  ],\n  \"with_market_payload\": true\n}")

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

	req.Header.Add("KALSHI-ACCESS-KEY", "<api-key>")
	req.Header.Add("KALSHI-ACCESS-SIGNATURE", "<api-key>")
	req.Header.Add("KALSHI-ACCESS-TIMESTAMP", "<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://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}")
  .header("KALSHI-ACCESS-KEY", "<api-key>")
  .header("KALSHI-ACCESS-SIGNATURE", "<api-key>")
  .header("KALSHI-ACCESS-TIMESTAMP", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"selected_markets\": [\n    {\n      \"market_ticker\": \"<string>\",\n      \"event_ticker\": \"<string>\"\n    }\n  ],\n  \"with_market_payload\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://external-api.kalshi.com/trade-api/v2/multivariate_event_collections/{collection_ticker}")

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

request = Net::HTTP::Post.new(url)
request["KALSHI-ACCESS-KEY"] = '<api-key>'
request["KALSHI-ACCESS-SIGNATURE"] = '<api-key>'
request["KALSHI-ACCESS-TIMESTAMP"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"selected_markets\": [\n    {\n      \"market_ticker\": \"<string>\",\n      \"event_ticker\": \"<string>\"\n    }\n  ],\n  \"with_market_payload\": true\n}"

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

{
  "event_ticker": "<string>",
  "market_ticker": "<string>",
  "market": {
    "ticker": "<string>",
    "event_ticker": "<string>",
    "yes_sub_title": "<string>",
    "no_sub_title": "<string>",
    "created_time": "2023-11-07T05:31:56Z",
    "updated_time": "2023-11-07T05:31:56Z",
    "open_time": "2023-11-07T05:31:56Z",
    "close_time": "2023-11-07T05:31:56Z",
    "latest_expiration_time": "2023-11-07T05:31:56Z",
    "settlement_timer_seconds": 123,
    "yes_bid_dollars": "0.5600",
    "yes_bid_size_fp": "10.00",
    "yes_ask_dollars": "0.5600",
    "yes_ask_size_fp": "10.00",
    "no_bid_dollars": "0.5600",
    "no_ask_dollars": "0.5600",
    "last_price_dollars": "0.5600",
    "volume_fp": "10.00",
    "volume_24h_fp": "10.00",
    "can_close_early": true,
    "open_interest_fp": "10.00",
    "notional_value_dollars": "0.5600",
    "previous_yes_bid_dollars": "0.5600",
    "previous_yes_ask_dollars": "0.5600",
    "previous_price_dollars": "0.5600",
    "expiration_value": "<string>",
    "rules_primary": "<string>",
    "rules_secondary": "<string>",
    "price_level_structure": "<string>",
    "price_ranges": [
      {
        "start": "<string>",
        "end": "<string>",
        "step": "<string>"
      }
    ],
    "title": "<string>",
    "subtitle": "<string>",
    "expected_expiration_time": "2023-11-07T05:31:56Z",
    "expiration_time": "2023-11-07T05:31:56Z",
    "liquidity_dollars": "0.5600",
    "settlement_value_dollars": "0.5600",
    "settlement_ts": "2023-11-07T05:31:56Z",
    "occurrence_datetime": "2023-11-07T05:31:56Z",
    "fee_waiver_expiration_time": "2023-11-07T05:31:56Z",
    "early_close_condition": "<string>",
    "floor_strike": 123,
    "cap_strike": 123,
    "functional_strike": "<string>",
    "custom_strike": {},
    "mve_collection_ticker": "<string>",
    "mve_selected_legs": [
      {
        "event_ticker": "<string>",
        "market_ticker": "<string>",
        "side": "<string>",
        "yes_settlement_value_dollars": "0.5600"
      }
    ],
    "primary_participant_key": "<string>",
    "is_provisional": true,
    "exchange_index": 0
  }
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<string>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<string>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<string>"
}

{
  "code": "<string>",
  "message": "<string>",
  "details": "<string>"
}