Candles

Fetch OHLCV candles for a single contract

Returns OHLCV candle bars for one (provider, contract_id, outcome) series over [start, end), bucketed at timeframe_seconds.

Auth: accepts an admin secret (X-Admin-Secret), an API key (X-Client-Id + X-Api-Key + X-Api-Secret), or a first-party JWT (Authorization: Bearer or turnkey_session_jwt cookie). No API-key scope is required for this endpoint — any valid credential can read candles.

Cache / data source: responses may be served from cache unless rebuild=true, which always bypasses the cache and reconstructs candles from the underlying trade/candle data, then repopulates the cache. rebuild=true is for callers that explicitly want fresh data regardless of what’s cached.

Validation (all return 400): unknown provider (must exist in the live provider registry — currently includes kalshi, polymarket, dome, opinion); empty or >128-char contract_id; timeframe_seconds not one of the fixed allowed values; unparseable start/end (ISO 8601); or end <= start. An outcome index invalid for the given provider/contract (e.g. an out-of-range index on a binary market) also returns 400.

GET

candles

Fetch OHLCV candles for a single contract

curl --request GET \
  --url https://data.kairos.trade/candles \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Api-Secret: <api-key>' \
  --header 'X-Client-Id: <api-key>'

import requests

url = "https://data.kairos.trade/candles"

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://data.kairos.trade/candles', 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://data.kairos.trade/candles",
  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://data.kairos.trade/candles"

	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://data.kairos.trade/candles")
  .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://data.kairos.trade/candles")

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

{
  "candles": [
    {
      "contract_id": "KXPRESPOLAND-24-DT",
      "timeframe_seconds": 60,
      "bucket_start": "2026-07-21T14:32:00+00:00",
      "open": 63.5,
      "high": 64,
      "low": 63,
      "close": 63.8,
      "volume": 1250,
      "token_id": "71321045679252212594626385532706912750332728571942532289631379312455583992563"
    }
  ]
}

{
  "detail": "Invalid timeframe. Must be one of: [1, 60, 300, 900, 3600, 14400, 86400]"
}

{
  "detail": "Not authenticated"
}

{
  "detail": "Invite required"
}

{
  "detail": [
    {}
  ]
}

{
  "error": "Rate limit exceeded: 100 per 1 minute"
}

{
  "detail": "Invalid provider"
}

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.

Query Parameters

provider

string

required

Venue identifier, matched case-insensitively against the live provider registry (e.g. kalshi, polymarket). Unknown providers return 400.

contract_id

string

required

Provider-specific contract/market/token identifier. Whitespace is trimmed; empty or >128 chars returns 400.

Required string length: 1 - 128

timeframe_seconds

enum<integer>

required

Candle bucket width in seconds. FastAPI first enforces >= 1; the handler then rejects any value not exactly one of [1, 60, 300, 900, 3600, 14400, 86400] (1s, 1m, 5m, 15m, 1h, 4h, 1d) with 400.

Available options:

1,

60,

300,

900,

3600,

14400,

86400

start

string<date-time>

required

Window start, ISO 8601 (any offset; normalized to UTC internally). Unparseable values return 400.

end

string<date-time>

required

Window end, ISO 8601. Must be strictly after start (400 otherwise).

outcome

integer | null

Zero-based outcome index for multi-outcome markets. Omitted/null is treated as 0 (the first/primary outcome). An index invalid for the contract's outcome count returns 400.

Required range: x >= 0

rebuild

boolean

default:false

When true, bypasses the cache and forces a fresh fetch/rebuild.

Response

OHLCV series for the requested window.

candles

object[]

required

Show child attributes

Fetch OHLCV candles for a single contract

curl --request GET \
  --url https://data.kairos.trade/candles \
  --header 'X-Api-Key: <api-key>' \
  --header 'X-Api-Secret: <api-key>' \
  --header 'X-Client-Id: <api-key>'

import requests

url = "https://data.kairos.trade/candles"

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://data.kairos.trade/candles', 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://data.kairos.trade/candles",
  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://data.kairos.trade/candles"

	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://data.kairos.trade/candles")
  .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://data.kairos.trade/candles")

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

{
  "candles": [
    {
      "contract_id": "KXPRESPOLAND-24-DT",
      "timeframe_seconds": 60,
      "bucket_start": "2026-07-21T14:32:00+00:00",
      "open": 63.5,
      "high": 64,
      "low": 63,
      "close": 63.8,
      "volume": 1250,
      "token_id": "71321045679252212594626385532706912750332728571942532289631379312455583992563"
    }
  ]
}

{
  "detail": "Invalid timeframe. Must be one of: [1, 60, 300, 900, 3600, 14400, 86400]"
}

{
  "detail": "Not authenticated"
}

{
  "detail": "Invite required"
}

{
  "detail": [
    {}
  ]
}

{
  "error": "Rate limit exceeded: 100 per 1 minute"
}

{
  "detail": "Invalid provider"
}

Overview

Market Data API

Data API

Execution API

Agora Auction API

REST Guides

Market Data Guides

RPC Guides

RFQ Guides

WebSocket Guides

Krisis Guides

Fetch OHLCV candles for a single contract

Authorizations

Query Parameters

Response