Create Margin FCM Subtrader

curl --request POST \
  --url https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders \
  --header 'Content-Type: application/json' \
  --header 'KALSHI-ACCESS-KEY: <api-key>' \
  --header 'KALSHI-ACCESS-SIGNATURE: <api-key>' \
  --header 'KALSHI-ACCESS-TIMESTAMP: <api-key>' \
  --data '
{
  "subtrader_suffix": "<string>",
  "require_category_cap": true
}
'

import requests

url = "https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders"

payload = {
    "subtrader_suffix": "<string>",
    "require_category_cap": 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({subtrader_suffix: '<string>', require_category_cap: true})
};

fetch('https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders', 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/margin/fcm/subtraders",
  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([
    'subtrader_suffix' => '<string>',
    'require_category_cap' => 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/margin/fcm/subtraders"

	payload := strings.NewReader("{\n  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": 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/margin/fcm/subtraders")
  .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  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders")

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  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": true\n}"

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

{
  "subtrader_id": "<string>"
}

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

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

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

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

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

POST

margin

fcm

subtraders

Create Margin FCM Subtrader

curl --request POST \
  --url https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders \
  --header 'Content-Type: application/json' \
  --header 'KALSHI-ACCESS-KEY: <api-key>' \
  --header 'KALSHI-ACCESS-SIGNATURE: <api-key>' \
  --header 'KALSHI-ACCESS-TIMESTAMP: <api-key>' \
  --data '
{
  "subtrader_suffix": "<string>",
  "require_category_cap": true
}
'

import requests

url = "https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders"

payload = {
    "subtrader_suffix": "<string>",
    "require_category_cap": 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({subtrader_suffix: '<string>', require_category_cap: true})
};

fetch('https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders', 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/margin/fcm/subtraders",
  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([
    'subtrader_suffix' => '<string>',
    'require_category_cap' => 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/margin/fcm/subtraders"

	payload := strings.NewReader("{\n  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": 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/margin/fcm/subtraders")
  .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  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": true\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://external-api.kalshi.com/trade-api/v2/margin/fcm/subtraders")

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  \"subtrader_suffix\": \"<string>\",\n  \"require_category_cap\": true\n}"

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

{
  "subtrader_id": "<string>"
}

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

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

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

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

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

Authorizations

KALSHI-ACCESS-KEY

string

header

required

Your API key ID

KALSHI-ACCESS-SIGNATURE

string

header

required

Base64 signature of the pre-sign text (timestamp + method + path) made with the API key's algorithm - RSA-PSS with SHA-256 for RSA keys, Ed25519 for Ed25519 keys

KALSHI-ACCESS-TIMESTAMP

string

header

required

Request timestamp in milliseconds

Body

application/json

subtrader_suffix

string

required

Suffix for the new subtrader. The full subtrader id is composed server-side as {user_id}_{subtrader_suffix}.

Pattern: ^[A-Za-z0-9]{1,16}$

require_category_cap

boolean

required

Required. Explicitly choose true or false. When true, ordinary orders require an explicit asset-class initial margin cap. Subtrader-wide and market caps do not satisfy this requirement. Dedicated liquidation remains allowed. Set only when explicitly creating a subtrader and cannot be changed afterward.

Response

Subtrader created successfully

subtrader_id

string

required

The full id of the created subtrader, in the form {user_id}_{subtrader_suffix}.

Overview

REST

WebSockets

FIX

Create Margin FCM Subtrader

Authorizations

Body

Response