API — Options chain & OPEX

Options chain

Per-contract data (greeks, OI, IV, bid/ask) plus aggregate stats. Filters supported:

expiries — CSV of tokens (e.g. 28MAR25,25APR25).
dte_min / dte_max — days-to-expiry bounds.
oi_min / oi_max — open interest bounds.
delta_min / delta_max — applied to |delta| (0..1).
strike_min / strike_max — absolute strike bounds.
moneyness_min / moneyness_max — strike / spot ratio bounds, e.g. 0.9..1.1 keeps strikes within ±10% of spot. Useful for cross-symbol screens since it normalises the strike grid.
option_type — call, put, or both.

Two layers of projection:

fields (top-level): comma-sep subset of aggregates,available_expiries,contracts — drops whole sections of the response, e.g. ?fields=contracts to skip aggregates.
include (per-contract): comma-sep subset of bid_ask,gex,greeks,iv,oi,volume — keeps only the named sub-sections of each contract dict. Core identity fields (strike,expiry,dte,type) are always present. Default is every section, matching v1 shape.

Payload is capped at ?max_contracts= (default 2000, hard ceiling 5000). On overflow the response is truncated to the closest-to-spot subset and truncated=true is set with total_matching_count so the client knows to narrow the filter.

Response is cached for 30s keyed by the exact filter combination, so repeated calls with identical filters are sub-millisecond.

GET

options

chain

Filtered options chain

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

import requests

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

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/chain', 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/chain",
  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/chain"

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

require 'uri'
require 'net/http'

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

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": {
    "contracts": [
      {
        "strike": 123,
        "expiry": "<string>",
        "dte": 123,
        "oi": 123,
        "iv": 123,
        "mark": 123,
        "bid": 123,
        "ask": 123,
        "volume": 123,
        "notional_volume": 123,
        "trade_count": 123,
        "delta": 123,
        "gamma": 123,
        "theta": 123,
        "vega": 123,
        "vanna": 123,
        "charm": 123,
        "gex": 123
      }
    ],
    "aggregates": {
      "net_gex": 123,
      "call_gex": 123,
      "put_gex": 123,
      "total_oi": 123,
      "call_oi": 123,
      "put_oi": 123,
      "contract_count": 123,
      "pcr": 123,
      "atm_iv": 123
    },
    "available_expiries": [
      "<string>"
    ],
    "truncated": true,
    "total_matching_count": 123,
    "max_contracts": 123
  },
  "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"
  }
}

Filtered chain with two-layer projection (?fields= top-level, ?include= per-contract) and a payload cap (?max_contracts). Cached 30s per filter combination.

Greeks beyond delta

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

expiries

string | null

CSV of expiry tokens (e.g. 28MAR25,25APR25)

dte_min

integer | null

Inclusive lower bound on days-to-expiry.

Required range: 0 <= x <= 720

dte_max

integer | null

Inclusive upper bound on days-to-expiry.

Required range: 0 <= x <= 720

oi_min

number | null

Minimum open interest per contract.

Required range: x >= 0

oi_max

number | null

Maximum open interest per contract.

Required range: x >= 0

delta_min

number | null

Minimum |delta| (0..1).

Required range: 0 <= x <= 1

delta_max

number | null

Maximum |delta| (0..1).

Required range: 0 <= x <= 1

strike_min

number | null

Minimum strike price (absolute).

Required range: x >= 0

strike_max

number | null

Maximum strike price (absolute).

Required range: x >= 0

moneyness_min

number | null

Strike/spot lower bound (e.g. 0.9 for ATM-10%).

Required range: 0 <= x <= 10

moneyness_max

number | null

Strike/spot upper bound (e.g. 1.1 for ATM+10%).

Required range: 0 <= x <= 10

option_type

enum<string>

default:both

Filter to call, put, or both contract types.

Available options:

call,

put,

both

max_contracts

integer

default:2000

Cap on the number of contracts returned (default 2000, hard ceiling 5000). When more contracts match the filters, the response is truncated to the closest-to-spot subset and truncated=true is set with total_matching_count so the client knows to narrow the filter.

Required range: 1 <= x <= 5000

fields

string | null

Top-level projection: aggregates,available_expiries,contracts

include

string | null

Per-contract projection: bid_ask,gex,greeks,iv,oi,volume. Default is all sections.

Response

Successful Response

data

ChainData · 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

Max pain

Per-expiry summary

Filtered options chain

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

import requests

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

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/chain', 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/chain",
  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/chain"

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

require 'uri'
require 'net/http'

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

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": {
    "contracts": [
      {
        "strike": 123,
        "expiry": "<string>",
        "dte": 123,
        "oi": 123,
        "iv": 123,
        "mark": 123,
        "bid": 123,
        "ask": 123,
        "volume": 123,
        "notional_volume": 123,
        "trade_count": 123,
        "delta": 123,
        "gamma": 123,
        "theta": 123,
        "vega": 123,
        "vanna": 123,
        "charm": 123,
        "gex": 123
      }
    ],
    "aggregates": {
      "net_gex": 123,
      "call_gex": 123,
      "put_gex": 123,
      "total_oi": 123,
      "call_oi": 123,
      "put_oi": 123,
      "contract_count": 123,
      "pcr": 123,
      "atm_iv": 123
    },
    "available_expiries": [
      "<string>"
    ],
    "truncated": true,
    "total_matching_count": 123,
    "max_contracts": 123
  },
  "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

Greeks beyond delta

Authorizations

Headers

Query Parameters

Response

See also