Get a venue's capability set
The capabilities sub-object of GET /exchanges/{exchange_id}, on its own. This is the endpoint to consult before submitting an order: it tells you the venue’s supported_tif, whether it honours post_only, its min_tick_size / min_order_size / max_price, and whether POST /orders/cancel-all is available (supports_cancel_all). Requires authentication but no scope.
curl --request GET \
--url https://execution.kairos.trade/exchanges/{exchange_id}/capabilities \
--header 'X-Api-Key: <api-key>' \
--header 'X-Api-Secret: <api-key>' \
--header 'X-Client-Id: <api-key>'import requests
url = "https://execution.kairos.trade/exchanges/{exchange_id}/capabilities"
headers = {
"X-Client-Id": "<api-key>",
"X-Api-Key": "<api-key>",
"X-Api-Secret": "<api-key>"
}
response = requests.get(url, headers=headers)
print(response.text)const options = {
method: 'GET',
headers: {
'X-Client-Id': '<api-key>',
'X-Api-Key': '<api-key>',
'X-Api-Secret': '<api-key>'
}
};
fetch('https://execution.kairos.trade/exchanges/{exchange_id}/capabilities', 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://execution.kairos.trade/exchanges/{exchange_id}/capabilities",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"X-Api-Key: <api-key>",
"X-Api-Secret: <api-key>",
"X-Client-Id: <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"
"net/http"
"io"
)
func main() {
url := "https://execution.kairos.trade/exchanges/{exchange_id}/capabilities"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("X-Client-Id", "<api-key>")
req.Header.Add("X-Api-Key", "<api-key>")
req.Header.Add("X-Api-Secret", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://execution.kairos.trade/exchanges/{exchange_id}/capabilities")
.header("X-Client-Id", "<api-key>")
.header("X-Api-Key", "<api-key>")
.header("X-Api-Secret", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://execution.kairos.trade/exchanges/{exchange_id}/capabilities")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["X-Client-Id"] = '<api-key>'
request["X-Api-Key"] = '<api-key>'
request["X-Api-Secret"] = '<api-key>'
response = http.request(request)
puts response.read_body{
"exchange_id": "<string>",
"display_name": "<string>",
"supported_order_types": {
"market": true,
"limit": true,
"stop_loss": true,
"stop_limit": true,
"take_profit": true,
"trailing_stop": true
},
"supported_tif": [
"GTC"
],
"requires_allowances": true,
"supports_redemption": true,
"has_outcome_tokens": true,
"supports_user_websocket": true,
"supports_cancel_all": true,
"supports_batch_orders": true,
"min_tick_size": "<string>",
"min_order_size": "<string>",
"fee_model": "zero_fee",
"settlement_currency": "<string>",
"autonomous_settlement": true,
"settlement_deferred_fill": true,
"is_active": true,
"supports_post_only": false,
"max_order_size": "<string>",
"maker_fee_bps": 123,
"taker_fee_bps": 123,
"chain_id": "<string>",
"sell_quantity_decimals": 123,
"max_price": "<string>",
"ws_fill_authoritative": false,
"ws_fills_include_exchange_fee": false,
"supports_native_amend": false
}{
"error": "Unauthorized"
}Authorizations
Credential client id (kairos_ck_...). Must be sent together with X-Api-Key and X-Api-Secret.
64-char hex API key.
64-char hex API secret.
Path Parameters
"polymarket"
Response
The venue's capabilities.
What a venue supports. This is the authoritative source for the per-venue constraints
POST /orders enforces — a time_in_force outside supported_tif, or post_only on a venue
with supports_post_only: false, is rejected with 400, never silently downgraded.
Current production values:
| Venue | supported_tif | supports_post_only | min_tick_size | max_price | settlement_currency |
|---|---|---|---|---|---|
polymarket | GTC, GTD, FOK, FAK, IOC | true | 0.01 | 1 | USDC |
predictfun | GTC, GTD, FOK, FAK, IOC | true | 0.001 | 1 | USDT |
kalshi | GTC, GTD, IOC, FAK, FOK | true | 0.01 | 1 | USD |
hyperliquid | GTC, GTD, IOC, FAK, FOK | true (expressed venue-side as the Alo TIF) | 0.0001 | none | USDC |
opinion | GTC only | false | 0.01 | 1 | USDC |
kalshi_offchain is a deprecated alias that canonicalizes to kalshi.
The CANONICAL venue id — may differ from the id you requested (kalshi_offchain resolves to kalshi).
Which order types the venue's adapter implements.
Show child attributes
Show child attributes
Time-in-force, always UPPER-CASE on the wire. GTC/GTD are resting (limit-style); FOK/FAK/IOC are immediate taker executions.
GTC, GTD, FOK, FAK, IOC When false, POST /orders/cancel-all is not available for this venue.
Decimal string.
Decimal string.
zero_fee, maker_rebate, tiered_schedule, fixed_bps Decimal string (e.g. "137"), or null for off-chain venues.
Decimal places a SELL quantity is truncated to before submission.
Decimal string. The ceiling price and trigger_price are validated against.
Venue-native amend exists. FIX replace otherwise uses durable synthetic replacement.
Was this page helpful?
curl --request GET \
--url https://execution.kairos.trade/exchanges/{exchange_id}/capabilities \
--header 'X-Api-Key: <api-key>' \
--header 'X-Api-Secret: <api-key>' \
--header 'X-Client-Id: <api-key>'import requests
url = "https://execution.kairos.trade/exchanges/{exchange_id}/capabilities"
headers = {
"X-Client-Id": "<api-key>",
"X-Api-Key": "<api-key>",
"X-Api-Secret": "<api-key>"
}
response = requests.get(url, headers=headers)
print(response.text)const options = {
method: 'GET',
headers: {
'X-Client-Id': '<api-key>',
'X-Api-Key': '<api-key>',
'X-Api-Secret': '<api-key>'
}
};
fetch('https://execution.kairos.trade/exchanges/{exchange_id}/capabilities', 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://execution.kairos.trade/exchanges/{exchange_id}/capabilities",
CURLOPT_RETURNTRANSFER => true,
CURLOPT_ENCODING => "",
CURLOPT_MAXREDIRS => 10,
CURLOPT_TIMEOUT => 30,
CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
CURLOPT_CUSTOMREQUEST => "GET",
CURLOPT_HTTPHEADER => [
"X-Api-Key: <api-key>",
"X-Api-Secret: <api-key>",
"X-Client-Id: <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"
"net/http"
"io"
)
func main() {
url := "https://execution.kairos.trade/exchanges/{exchange_id}/capabilities"
req, _ := http.NewRequest("GET", url, nil)
req.Header.Add("X-Client-Id", "<api-key>")
req.Header.Add("X-Api-Key", "<api-key>")
req.Header.Add("X-Api-Secret", "<api-key>")
res, _ := http.DefaultClient.Do(req)
defer res.Body.Close()
body, _ := io.ReadAll(res.Body)
fmt.Println(string(body))
}HttpResponse<String> response = Unirest.get("https://execution.kairos.trade/exchanges/{exchange_id}/capabilities")
.header("X-Client-Id", "<api-key>")
.header("X-Api-Key", "<api-key>")
.header("X-Api-Secret", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://execution.kairos.trade/exchanges/{exchange_id}/capabilities")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Get.new(url)
request["X-Client-Id"] = '<api-key>'
request["X-Api-Key"] = '<api-key>'
request["X-Api-Secret"] = '<api-key>'
response = http.request(request)
puts response.read_body{
"exchange_id": "<string>",
"display_name": "<string>",
"supported_order_types": {
"market": true,
"limit": true,
"stop_loss": true,
"stop_limit": true,
"take_profit": true,
"trailing_stop": true
},
"supported_tif": [
"GTC"
],
"requires_allowances": true,
"supports_redemption": true,
"has_outcome_tokens": true,
"supports_user_websocket": true,
"supports_cancel_all": true,
"supports_batch_orders": true,
"min_tick_size": "<string>",
"min_order_size": "<string>",
"fee_model": "zero_fee",
"settlement_currency": "<string>",
"autonomous_settlement": true,
"settlement_deferred_fill": true,
"is_active": true,
"supports_post_only": false,
"max_order_size": "<string>",
"maker_fee_bps": 123,
"taker_fee_bps": 123,
"chain_id": "<string>",
"sell_quantity_decimals": 123,
"max_price": "<string>",
"ws_fill_authoritative": false,
"ws_fills_include_exchange_fee": false,
"supports_native_amend": false
}{
"error": "Unauthorized"
}
