Combo

Price a combo cash-out (SELL) without executing it

Returns the real maker-quoted proceeds for selling an open combo, and subtracts the Kairos platform fee so the preview matches what actually lands in the wallet. A client-side shares × ∏(leg price) estimate ignores the maker’s spread and systematically overstates the payout — show netProceedsE6, not a local calculation. The platform-fee lookup fails closed: a tier-lookup error rejects the quote rather than displaying an optimistic zero fee. Fully-resolved and dead combos are rejected up front. No maker quotes a settled binary, so the RFQ would simply hang; a combo that has fully resolved, or that has any single RESOLVED_LOSS leg, gets an immediate 400 instead. A won, fully-resolved combo is redeemed via POST /combo/redeem, not cashed out. Rate limited at 20 quotes/minute per user (COMBO_QUOTE_RATE_LIMIT_PER_MIN), fail-closed, because each call holds an external RFQ websocket open until the gateway timeout. The 429 carries error_details.code = EXCHANGE_POLYMARKET_RATE_LIMITED. No Retry-After header. Auth & scope. Requires position:read for polymarket AND the mutation gate (it is a POST behind RequireServiceToken despite being read-only), so an API-key triple or CSRF token is needed — a bare Bearer JWT is not enough.

POST

combo

cash-out-quote

curl --request POST \
  --url https://execution.kairos.trade/combo/cash-out-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>"
  ],
  "shares": 123
}
'

import requests

url = "https://execution.kairos.trade/combo/cash-out-quote"

payload = {
    "legPositionIds": ["<string>"],
    "shares": 123
}
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>'], shares: 123})
};

fetch('https://execution.kairos.trade/combo/cash-out-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/cash-out-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>'
    ],
    'shares' => 123
  ]),
  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/cash-out-quote"

	payload := strings.NewReader("{\n  \"legPositionIds\": [\n    \"<string>\"\n  ],\n  \"shares\": 123\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/cash-out-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  \"shares\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://execution.kairos.trade/combo/cash-out-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  \"shares\": 123\n}"

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

{
  "rfqId": "<string>",
  "proceedsE6": "<string>",
  "feeE6": "<string>",
  "netProceedsE6": "<string>",
  "blendedPriceE6": "<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>"
}

{
  "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

X-Client-Id

string

header

required

Credential client id (kairos_ck_...). Must be sent together with X-Api-Key and X-Api-Secret.

X-Api-Key

string

header

required

64-char hex API key.

X-Api-Secret

string

header

required

64-char hex API secret.

Body

application/json

Body for POST /combo/cash-out-quote.

legPositionIds

string[]

required

The combo's leg position ids, from the position's legs[].legPositionId.

Required array length: 2 - 10 elements

number<double>

required

Shares to price. Must be finite and > 0. Pass the full sharesBalance to preview a complete close.

Response

Gross proceeds, platform fee, and net proceeds.

Response for POST /combo/cash-out-quote. All amounts are six-decimal fixed-point integer strings.

rfqId

string

required

proceedsE6

string

required

GROSS pUSD proceeds from the maker quote. The minProceedsUsd floor on POST /combo/cash-out is checked against this, not against the net.

feeE6

string

required

Estimated Kairos platform fee on the proceeds.

netProceedsE6

string

required

Proceeds after the platform fee — what actually lands. This is the number to show in a cash-out preview.

blendedPriceE6

string

required

Price a combo cash-out (SELL) without executing it

curl --request POST \
  --url https://execution.kairos.trade/combo/cash-out-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>"
  ],
  "shares": 123
}
'

import requests

url = "https://execution.kairos.trade/combo/cash-out-quote"

payload = {
    "legPositionIds": ["<string>"],
    "shares": 123
}
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>'], shares: 123})
};

fetch('https://execution.kairos.trade/combo/cash-out-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/cash-out-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>'
    ],
    'shares' => 123
  ]),
  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/cash-out-quote"

	payload := strings.NewReader("{\n  \"legPositionIds\": [\n    \"<string>\"\n  ],\n  \"shares\": 123\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/cash-out-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  \"shares\": 123\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://execution.kairos.trade/combo/cash-out-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  \"shares\": 123\n}"

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

{
  "rfqId": "<string>",
  "proceedsE6": "<string>",
  "feeE6": "<string>",
  "netProceedsE6": "<string>",
  "blendedPriceE6": "<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>"
}

{
  "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>"
}

Overview

Market Data API

Data API

Execution API

Agora Auction API

REST Guides

Market Data Guides

RPC Guides

RFQ Guides

WebSocket Guides

Krisis Guides

Price a combo cash-out (SELL) without executing it

Authorizations

Body

Response