API — Options chain & OPEX

Per-expiry summary

One row per active expiry with the metrics most useful for chain-wide screening:

Pre-computed every 30s — ATM IV, 25Δ skew, put/call 25Δ IVs, PCR, call/put/total OI, net GEX.

Added by v2 (OPEX enrichment, on-the-fly):

type — daily | weekly | monthly | quarterly (Deribit token parsed; quarterlies are last Fridays of Mar/Jun/Sep/Dec).
is_anchor — true for monthly + quarterly anchors.
expiry_date — ISO date when the token parses cleanly.
notional_oi_usd — total_oi × spot_price (each contract is 1 unit of underlying on Deribit-style chains).
max_pain — {strike, value} from a per-expiry max-pain pass over the latest chain snapshot. Cached 30s, shared with /v2/gex/max-pain and /v2/options/opex.

GET

options

expiry-summary

Per-expiry IV / skew / PCR / OI / GEX (with OPEX enrichment)

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

import requests

url = "https://api.example.com/options/expiry-summary"

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/expiry-summary', 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/expiry-summary",
  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/expiry-summary"

	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/expiry-summary")
  .header("X-API-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/options/expiry-summary")

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": {
    "expiries": [
      {
        "expiry": "<string>",
        "is_anchor": true,
        "dte": 123,
        "atm_iv": 123,
        "skew_25d": 123,
        "put_25d_iv": 123,
        "call_25d_iv": 123,
        "pcr": 123,
        "call_oi": 123,
        "put_oi": 123,
        "total_oi": 123,
        "net_gex": 123,
        "expiry_date": "<string>",
        "notional_oi_usd": 123,
        "max_pain": {
          "strike": 123,
          "value": 123
        }
      }
    ],
    "anchor_count": 123,
    "type_counts": {
      "daily": 0,
      "weekly": 0,
      "monthly": 0,
      "quarterly": 0
    }
  },
  "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"
  }
}

One row per active expiry with ATM IV, 25Δ skew, PCR, OI, net GEX, plus OPEX enrichment (type, is_anchor, expiry_date, notional_oi_usd, max_pain).

OPEX calendar

IV suite

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

Response

Successful Response

data

ExpirySummaryData · 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

Options chain

OPEX calendar

Per-expiry IV / skew / PCR / OI / GEX (with OPEX enrichment)

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

import requests

url = "https://api.example.com/options/expiry-summary"

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/expiry-summary', 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/expiry-summary",
  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/expiry-summary"

	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/expiry-summary")
  .header("X-API-Key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.example.com/options/expiry-summary")

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": {
    "expiries": [
      {
        "expiry": "<string>",
        "is_anchor": true,
        "dte": 123,
        "atm_iv": 123,
        "skew_25d": 123,
        "put_25d_iv": 123,
        "call_25d_iv": 123,
        "pcr": 123,
        "call_oi": 123,
        "put_oi": 123,
        "total_oi": 123,
        "net_gex": 123,
        "expiry_date": "<string>",
        "notional_oi_usd": 123,
        "max_pain": {
          "strike": 123,
          "value": 123
        }
      }
    ],
    "anchor_count": 123,
    "type_counts": {
      "daily": 0,
      "weekly": 0,
      "monthly": 0,
      "quarterly": 0
    }
  },
  "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

IV suite

Authorizations

Headers

Query Parameters

Response

See also