API — Options chain & OPEX

OPEX calendar

Curated calendar of upcoming options expirations with everything needed for OPEX-day workflows in one call:

Token + ISO date + DTE + classification (daily / weekly / monthly / quarterly) + is_anchor flag.
OI block: call_oi, put_oi, total_oi, pcr, notional_oi_usd (= total_oi × spot, since each crypto options contract is 1 unit of underlying).
IV block: atm_iv, skew_25d, put_25d_iv, call_25d_iv.
Gamma block: net_gex, call_resistance, put_support (computed per expiry from the strike × expiry heatmap), and max_pain ({strike, value} from the shared per-expiry cache used by /v2/gex/max-pain and /v2/options/expiry- summary).

next_anchor points at the closest monthly/quarterly. Filter with ?types=monthly,quarterly for the institutional-roll view or ?horizon= to bound the look-ahead window.

GET

options

opex

OPEX calendar with per-expiry context

curl --request GET \
  --url https://api.example.com/options/opex \
  --header 'X-API-Key: <api-key>'

import requests

url = "https://api.example.com/options/opex"

headers = {"X-API-Key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://api.example.com/options/opex', 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://api.example.com/options/opex",
  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>"
  ],
]);

$response = curl_exec($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://api.example.com/options/opex"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-API-Key", "<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://api.example.com/options/opex")
  .header("X-API-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/options/opex")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["X-API-Key"] = '<api-key>'

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

{
  "data": {
    "symbol": "<string>",
    "horizon_days": 123,
    "expirations": [
      {
        "expiry": "<string>",
        "is_anchor": true,
        "oi": {
          "call_oi": 123,
          "put_oi": 123,
          "total_oi": 123,
          "pcr": 123,
          "notional_oi_usd": 123
        },
        "iv": {
          "atm_iv": 123,
          "skew_25d": 123,
          "put_25d_iv": 123,
          "call_25d_iv": 123
        },
        "gamma": {
          "net_gex": 123,
          "call_resistance": 123,
          "put_support": 123,
          "max_pain": {
            "strike": 123,
            "value": 123
          }
        },
        "expiry_date": "<string>",
        "dte": 123
      }
    ],
    "count": 123,
    "type_counts": {
      "daily": 0,
      "weekly": 0,
      "monthly": 0,
      "quarterly": 0
    },
    "spot_price": 123,
    "next_anchor": {
      "type": "<string>",
      "expiry": "<string>",
      "expiry_date": "<string>",
      "dte": 123
    },
    "filtered_types": [
      "<string>"
    ]
  },
  "meta": {
    "version": "<string>",
    "timestamp": "<string>",
    "request_id": "<string>",
    "symbol": "<string>",
    "spot_price": 123,
    "computed_at": "<string>",
    "freshness_seconds": 123,
    "source": [
      "<string>"
    ],
    "exchanges_filtered": [
      "<string>"
    ],
    "rate_limit": {},
    "extra": {}
  },
  "success": true
}

{
  "success": false,
  "error": {
    "code": "UNAUTHORIZED",
    "message": "Invalid API key"
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  },
  "meta": {
    "version": "<string>",
    "timestamp": "<string>",
    "request_id": "<string>",
    "symbol": "<string>",
    "spot_price": 123,
    "computed_at": "<string>",
    "freshness_seconds": 123,
    "source": [
      "<string>"
    ],
    "exchanges_filtered": [
      "<string>"
    ],
    "rate_limit": {},
    "extra": {}
  },
  "success": false
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters",
    "details": {
      "errors": []
    }
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "RATE_LIMIT_EXCEEDED",
    "message": "Rate limit exceeded. Try again later."
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

Curated calendar of upcoming expirations with type classification, anchor flag, OI, IV, gamma blocks (walls + max-pain), and next_anchor pointer.

OPEX calendar

Max pain

Authorizations

X-API-Key

string

header

required

Your BackQuant API key (same key as v1)

Headers

X-API-Key

string | null

Query Parameters

symbol

enum<string>

default:BTCUSDT

Trading symbol: BTCUSDT, ETHUSDT, SOLUSDT, or HYPEUSDT.

Available options:

BTCUSDT,

ETHUSDT,

SOLUSDT,

HYPEUSDT

horizon

integer

default:30

Look-ahead window in days (1–365). Drops expiries beyond this.

Required range: 1 <= x <= 365

types

string | null

CSV filter on the type field: any subset of daily,weekly,monthly,quarterly. Default returns all types.

Response

Successful Response

data

OpexData · object

required

Show child attributes

meta

V2Meta · object

required

The meta block returned alongside every v2 response.

Every field after version/timestamp is optional because endpoints attach different combinations — e.g. /v2/status skips symbol, the chain endpoint sets extra.filter_hash, etc. Listing them here means SDKs get a typed accessor for each instead of a generic meta: dict.

Show child attributes

success

boolean

default:true

Per-expiry summary

IV surface

OPEX calendar with per-expiry context

curl --request GET \
  --url https://api.example.com/options/opex \
  --header 'X-API-Key: <api-key>'

import requests

url = "https://api.example.com/options/opex"

headers = {"X-API-Key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {'X-API-Key': '<api-key>'}};

fetch('https://api.example.com/options/opex', 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://api.example.com/options/opex",
  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>"
  ],
]);

$response = curl_exec($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://api.example.com/options/opex"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("X-API-Key", "<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://api.example.com/options/opex")
  .header("X-API-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/options/opex")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Get.new(url)
request["X-API-Key"] = '<api-key>'

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

{
  "data": {
    "symbol": "<string>",
    "horizon_days": 123,
    "expirations": [
      {
        "expiry": "<string>",
        "is_anchor": true,
        "oi": {
          "call_oi": 123,
          "put_oi": 123,
          "total_oi": 123,
          "pcr": 123,
          "notional_oi_usd": 123
        },
        "iv": {
          "atm_iv": 123,
          "skew_25d": 123,
          "put_25d_iv": 123,
          "call_25d_iv": 123
        },
        "gamma": {
          "net_gex": 123,
          "call_resistance": 123,
          "put_support": 123,
          "max_pain": {
            "strike": 123,
            "value": 123
          }
        },
        "expiry_date": "<string>",
        "dte": 123
      }
    ],
    "count": 123,
    "type_counts": {
      "daily": 0,
      "weekly": 0,
      "monthly": 0,
      "quarterly": 0
    },
    "spot_price": 123,
    "next_anchor": {
      "type": "<string>",
      "expiry": "<string>",
      "expiry_date": "<string>",
      "dte": 123
    },
    "filtered_types": [
      "<string>"
    ]
  },
  "meta": {
    "version": "<string>",
    "timestamp": "<string>",
    "request_id": "<string>",
    "symbol": "<string>",
    "spot_price": 123,
    "computed_at": "<string>",
    "freshness_seconds": 123,
    "source": [
      "<string>"
    ],
    "exchanges_filtered": [
      "<string>"
    ],
    "rate_limit": {},
    "extra": {}
  },
  "success": true
}

{
  "success": false,
  "error": {
    "code": "UNAUTHORIZED",
    "message": "Invalid API key"
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

{
  "error": {
    "code": "<string>",
    "message": "<string>",
    "details": {}
  },
  "meta": {
    "version": "<string>",
    "timestamp": "<string>",
    "request_id": "<string>",
    "symbol": "<string>",
    "spot_price": 123,
    "computed_at": "<string>",
    "freshness_seconds": 123,
    "source": [
      "<string>"
    ],
    "exchanges_filtered": [
      "<string>"
    ],
    "rate_limit": {},
    "extra": {}
  },
  "success": false
}

{
  "success": false,
  "error": {
    "code": "VALIDATION_ERROR",
    "message": "Invalid request parameters",
    "details": {
      "errors": []
    }
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

{
  "success": false,
  "error": {
    "code": "RATE_LIMIT_EXCEEDED",
    "message": "Rate limit exceeded. Try again later."
  },
  "meta": {
    "version": "2.0",
    "timestamp": "2026-04-29T12:00:00Z"
  }
}

​See also

OPEX calendar

Max pain

Authorizations

Headers

Query Parameters

Response

See also