curl --request PUT \
--url https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap \
--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_id": "<string>",
"limit": "0.5600"
}
'import requests
url = "https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap"
payload = {
"subtrader_id": "<string>",
"limit": "0.5600"
}
headers = {
"KALSHI-ACCESS-KEY": "<api-key>",
"KALSHI-ACCESS-SIGNATURE": "<api-key>",
"KALSHI-ACCESS-TIMESTAMP": "<api-key>",
"Content-Type": "application/json"
}
response = requests.put(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'PUT',
headers: {
'KALSHI-ACCESS-KEY': '<api-key>',
'KALSHI-ACCESS-SIGNATURE': '<api-key>',
'KALSHI-ACCESS-TIMESTAMP': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({subtrader_id: '<string>', limit: '0.5600'})
};
fetch('https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap', 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/fcm/subtraders/event_contract_daily_cap",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => json_encode([
'subtrader_id' => '<string>',
'limit' => '0.5600'
]),
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/fcm/subtraders/event_contract_daily_cap"
payload := strings.NewReader("{\n \"subtrader_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}")
req, _ := http.NewRequest("PUT", 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.put("https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap")
.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_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Put.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_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}"
response = http.request(request)
puts response.read_body{}{
"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>"
}Update FCM Subtrader Event Contract Daily Cap
Sets the event-contract daily premium cap for an FCM member’s subtrader. The cap bounds the subtrader’s net premium at risk per trading day. It is enforced on cap-reservation sessions — which every subtrader-bound API key uses — and is mandatory there: a subtrader with no cap cannot trade through its bound keys. Cap changes take effect immediately; existing resting orders are never cancelled by a cap change.
curl --request PUT \
--url https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap \
--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_id": "<string>",
"limit": "0.5600"
}
'import requests
url = "https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap"
payload = {
"subtrader_id": "<string>",
"limit": "0.5600"
}
headers = {
"KALSHI-ACCESS-KEY": "<api-key>",
"KALSHI-ACCESS-SIGNATURE": "<api-key>",
"KALSHI-ACCESS-TIMESTAMP": "<api-key>",
"Content-Type": "application/json"
}
response = requests.put(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'PUT',
headers: {
'KALSHI-ACCESS-KEY': '<api-key>',
'KALSHI-ACCESS-SIGNATURE': '<api-key>',
'KALSHI-ACCESS-TIMESTAMP': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({subtrader_id: '<string>', limit: '0.5600'})
};
fetch('https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap', 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/fcm/subtraders/event_contract_daily_cap",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "PUT",
CURLOPT_POSTFIELDS => json_encode([
'subtrader_id' => '<string>',
'limit' => '0.5600'
]),
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/fcm/subtraders/event_contract_daily_cap"
payload := strings.NewReader("{\n \"subtrader_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}")
req, _ := http.NewRequest("PUT", 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.put("https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap")
.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_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://external-api.kalshi.com/trade-api/v2/fcm/subtraders/event_contract_daily_cap")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Put.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_id\": \"<string>\",\n \"limit\": \"0.5600\"\n}"
response = http.request(request)
puts response.read_body{}{
"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
Your API key ID
RSA-PSS signature of the request
Request timestamp in milliseconds
Body
The subtrader whose daily cap should be set. Must belong to the requesting FCM.
Fixed-point US dollar string. Most request fields accept 2-4 decimal places (e.g., "0.56", "0.5600"); responses emit up to 6. Valid quote intervals for a given market are constrained by that market's price level structure.
"0.5600"
Response
Daily cap updated successfully
An empty response body