API: IV analytics
Constant-maturity vol
ATM vol, 25- and 10-delta risk reversals and butterflies at fixed tenors from 7 days to 1 year, with static-arbitrage checks.
GET
/
options
/
iv
/
constant-maturity
Constant-maturity vol: ATM, risk reversals, butterflies
curl --request GET \
--url https://api.example.com/options/iv/constant-maturity \
--header 'X-API-Key: <api-key>'import requests
url = "https://api.example.com/options/iv/constant-maturity"
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/iv/constant-maturity', 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/iv/constant-maturity",
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/iv/constant-maturity"
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/iv/constant-maturity")
.header("X-API-Key", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/options/iv/constant-maturity")
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{
"success": false,
"error": {
"code": "UNAUTHORIZED",
"message": "Invalid API key"
},
"meta": {
"version": "2.0",
"timestamp": "2026-04-29T12:00:00Z"
}
}{
"success": false,
"error": {
"code": "NOT_FOUND",
"message": "No data for BTCUSDT"
},
"meta": {
"version": "2.0",
"timestamp": "2026-04-29T12:00:00Z"
}
}{
"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"
}
}The vol desk’s view of the surface: ATM, the 25- and 10-delta call and put
vols, risk reversals and butterflies at 7, 14, 30, 60, 90, 120, 180, 270 and
365 days. Fixed tenors compare cleanly across time and across coins, where
listed expiries roll.
Each expiry’s ATM and wings are read off its quoted smile at Black-76
forward-delta strikes; each tenor interpolates total variance linearly in
time between the two fitted expiries around it. Nothing is extrapolated: a
tenor or a wing the quotes do not reach is null.
Every response also carries the static-arbitrage checks on each fitted
smile (
Vols in percent.
butterfly_free, calendar_free, min_density_g) and a summary in
arbitrage. The full method is on
Vol surface methodology.
{
"tenors": [
{ "tenor_days": 30, "atm_iv": 35.53, "iv_25c": 35.35, "iv_25p": 37.59,
"iv_10c": 36.23, "iv_10p": 41.72, "rr_25": -2.24, "bf_25": 0.94,
"rr_10": -5.49, "bf_10": 3.45, "bracket_dte": [26.15, 47.15] }
],
"arbitrage": { "butterfly_free": true, "calendar_free": true, "violations": [] }
}
rr is call minus put, so it is negative when puts are
bid; /v2/options/iv/skew reports put minus call.
Current values only, refreshed with the surface about every 30 seconds.
See also
Vol surface methodology
Single-expiry smile
Authorizations
Your BackQuant API key (same key as v1)
Headers
Query Parameters
Trading symbol: BTCUSDT, ETHUSDT, SOLUSDT, or HYPEUSDT.
Available options:
BTCUSDT, ETHUSDT, SOLUSDT, HYPEUSDT Response
Successful Response
⌘I
Constant-maturity vol: ATM, risk reversals, butterflies
curl --request GET \
--url https://api.example.com/options/iv/constant-maturity \
--header 'X-API-Key: <api-key>'import requests
url = "https://api.example.com/options/iv/constant-maturity"
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/iv/constant-maturity', 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/iv/constant-maturity",
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/iv/constant-maturity"
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/iv/constant-maturity")
.header("X-API-Key", "<api-key>")
.asString();require 'uri'
require 'net/http'
url = URI("https://api.example.com/options/iv/constant-maturity")
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{
"success": false,
"error": {
"code": "UNAUTHORIZED",
"message": "Invalid API key"
},
"meta": {
"version": "2.0",
"timestamp": "2026-04-29T12:00:00Z"
}
}{
"success": false,
"error": {
"code": "NOT_FOUND",
"message": "No data for BTCUSDT"
},
"meta": {
"version": "2.0",
"timestamp": "2026-04-29T12:00:00Z"
}
}{
"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"
}
}