Price a Polymarket combo (parlay) without executing it
Returns the real maker-quoted blended price for a multi-leg Polymarket combo. A naive product of the individual leg prices does NOT match what the RFQ gateway quotes, so this is the only correct way to price a parlay before placing it.
Read-only: it opens an RFQ, takes the quote, drops the connection, and commits nothing. Polymarket-only — combos exist on no other venue.
camelCase. The whole /combo/* family uses camelCase request and response field names, where every Orders endpoint is snake_case — check the schema for the family you are calling rather than assuming one convention across this API. Prices and amounts are six-decimal fixed-point INTEGER strings ("16393" = 0.016393), not decimals.
Requires connected Polymarket credentials. Every wallet type can quote (quoting never signs), including imported wallet types that cannot yet execute a combo.
Auth & scope. Requires trade:read for polymarket. No mutation gate, so a session JWT alone works. Not rate limited.
curl --request POST \
--url https://execution.kairos.trade/combo/quote \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--header 'X-Api-Secret: <api-key>' \
--header 'X-Client-Id: <api-key>' \
--data '
{
"legPositionIds": [
"<string>"
],
"notionalUsd": 10
}
'import requests
url = "https://execution.kairos.trade/combo/quote"
payload = {
"legPositionIds": ["<string>"],
"notionalUsd": 10
}
headers = {
"X-Client-Id": "<api-key>",
"X-Api-Key": "<api-key>",
"X-Api-Secret": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'X-Client-Id': '<api-key>',
'X-Api-Key': '<api-key>',
'X-Api-Secret': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({legPositionIds: ['<string>'], notionalUsd: 10})
};
fetch('https://execution.kairos.trade/combo/quote', 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/combo/quote",
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([
'legPositionIds' => [
'<string>'
],
'notionalUsd' => 10
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"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"
"strings"
"net/http"
"io"
)
func main() {
url := "https://execution.kairos.trade/combo/quote"
payload := strings.NewReader("{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Client-Id", "<api-key>")
req.Header.Add("X-Api-Key", "<api-key>")
req.Header.Add("X-Api-Secret", "<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://execution.kairos.trade/combo/quote")
.header("X-Client-Id", "<api-key>")
.header("X-Api-Key", "<api-key>")
.header("X-Api-Secret", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://execution.kairos.trade/combo/quote")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Client-Id"] = '<api-key>'
request["X-Api-Key"] = '<api-key>'
request["X-Api-Secret"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}"
response = http.request(request)
puts response.read_body{
"yesPositionId": "<string>",
"blendedPriceE6": "<string>",
"totalRequiredE6": "<string>",
"conditionId": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "Unauthorized"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}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.
Body
Was this page helpful?
curl --request POST \
--url https://execution.kairos.trade/combo/quote \
--header 'Content-Type: application/json' \
--header 'X-Api-Key: <api-key>' \
--header 'X-Api-Secret: <api-key>' \
--header 'X-Client-Id: <api-key>' \
--data '
{
"legPositionIds": [
"<string>"
],
"notionalUsd": 10
}
'import requests
url = "https://execution.kairos.trade/combo/quote"
payload = {
"legPositionIds": ["<string>"],
"notionalUsd": 10
}
headers = {
"X-Client-Id": "<api-key>",
"X-Api-Key": "<api-key>",
"X-Api-Secret": "<api-key>",
"Content-Type": "application/json"
}
response = requests.post(url, json=payload, headers=headers)
print(response.text)const options = {
method: 'POST',
headers: {
'X-Client-Id': '<api-key>',
'X-Api-Key': '<api-key>',
'X-Api-Secret': '<api-key>',
'Content-Type': 'application/json'
},
body: JSON.stringify({legPositionIds: ['<string>'], notionalUsd: 10})
};
fetch('https://execution.kairos.trade/combo/quote', 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/combo/quote",
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([
'legPositionIds' => [
'<string>'
],
'notionalUsd' => 10
]),
CURLOPT_HTTPHEADER => [
"Content-Type: application/json",
"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"
"strings"
"net/http"
"io"
)
func main() {
url := "https://execution.kairos.trade/combo/quote"
payload := strings.NewReader("{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}")
req, _ := http.NewRequest("POST", url, payload)
req.Header.Add("X-Client-Id", "<api-key>")
req.Header.Add("X-Api-Key", "<api-key>")
req.Header.Add("X-Api-Secret", "<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://execution.kairos.trade/combo/quote")
.header("X-Client-Id", "<api-key>")
.header("X-Api-Key", "<api-key>")
.header("X-Api-Secret", "<api-key>")
.header("Content-Type", "application/json")
.body("{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}")
.asString();require 'uri'
require 'net/http'
url = URI("https://execution.kairos.trade/combo/quote")
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true
request = Net::HTTP::Post.new(url)
request["X-Client-Id"] = '<api-key>'
request["X-Api-Key"] = '<api-key>'
request["X-Api-Secret"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n \"legPositionIds\": [\n \"<string>\"\n ],\n \"notionalUsd\": 10\n}"
response = http.request(request)
puts response.read_body{
"yesPositionId": "<string>",
"blendedPriceE6": "<string>",
"totalRequiredE6": "<string>",
"conditionId": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "Unauthorized"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}{
"error": "<string>",
"error_details": {
"code": "FUNDS_INSUFFICIENT_USDC",
"message": "<string>",
"actions": [
{
"action": "enable_trading",
"label": "Add Funds",
"primary": true,
"url": "<string>"
}
],
"details": "<string>",
"metadata": {}
},
"code": "<string>"
}
