curl --request POST \
  --url https://api.fincept.in/quantlib/volatility/surface/smile \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "expiries": [
    0.25,
    0.5,
    1
  ],
  "strikes": [
    90,
    95,
    100,
    105,
    110
  ],
  "vol_matrix": [
    [
      0.28,
      0.26,
      0.24,
      0.25,
      0.27
    ],
    [
      0.27,
      0.25,
      0.23,
      0.24,
      0.26
    ],
    [
      0.26,
      0.24,
      0.22,
      0.23,
      0.25
    ]
  ],
  "query_expiry": 0.5,
  "query_strikes": [
    92,
    97,
    102,
    107
  ]
}
'

import requests

url = "https://api.fincept.in/quantlib/volatility/surface/smile"

payload = {
    "expiries": [0.25, 0.5, 1],
    "strikes": [90, 95, 100, 105, 110],
    "vol_matrix": [[0.28, 0.26, 0.24, 0.25, 0.27], [0.27, 0.25, 0.23, 0.24, 0.26], [0.26, 0.24, 0.22, 0.23, 0.25]],
    "query_expiry": 0.5,
    "query_strikes": [92, 97, 102, 107]
}
headers = {
    "X-API-Key": "<api-key>",
    "Content-Type": "application/json"
}

response = requests.post(url, json=payload, headers=headers)

print(response.text)

const options = {
  method: 'POST',
  headers: {'X-API-Key': '<api-key>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    expiries: [0.25, 0.5, 1],
    strikes: [90, 95, 100, 105, 110],
    vol_matrix: [
      [0.28, 0.26, 0.24, 0.25, 0.27],
      [0.27, 0.25, 0.23, 0.24, 0.26],
      [0.26, 0.24, 0.22, 0.23, 0.25]
    ],
    query_expiry: 0.5,
    query_strikes: [92, 97, 102, 107]
  })
};

fetch('https://api.fincept.in/quantlib/volatility/surface/smile', 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.fincept.in/quantlib/volatility/surface/smile",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_POSTFIELDS => json_encode([
    'expiries' => [
        0.25,
        0.5,
        1
    ],
    'strikes' => [
        90,
        95,
        100,
        105,
        110
    ],
    'vol_matrix' => [
        [
                0.28,
                0.26,
                0.24,
                0.25,
                0.27
        ],
        [
                0.27,
                0.25,
                0.23,
                0.24,
                0.26
        ],
        [
                0.26,
                0.24,
                0.22,
                0.23,
                0.25
        ]
    ],
    'query_expiry' => 0.5,
    'query_strikes' => [
        92,
        97,
        102,
        107
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json",
    "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"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.fincept.in/quantlib/volatility/surface/smile"

	payload := strings.NewReader("{\n  \"expiries\": [\n    0.25,\n    0.5,\n    1\n  ],\n  \"strikes\": [\n    90,\n    95,\n    100,\n    105,\n    110\n  ],\n  \"vol_matrix\": [\n    [\n      0.28,\n      0.26,\n      0.24,\n      0.25,\n      0.27\n    ],\n    [\n      0.27,\n      0.25,\n      0.23,\n      0.24,\n      0.26\n    ],\n    [\n      0.26,\n      0.24,\n      0.22,\n      0.23,\n      0.25\n    ]\n  ],\n  \"query_expiry\": 0.5,\n  \"query_strikes\": [\n    92,\n    97,\n    102,\n    107\n  ]\n}")

	req, _ := http.NewRequest("POST", url, payload)

	req.Header.Add("X-API-Key", "<api-key>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.post("https://api.fincept.in/quantlib/volatility/surface/smile")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"expiries\": [\n    0.25,\n    0.5,\n    1\n  ],\n  \"strikes\": [\n    90,\n    95,\n    100,\n    105,\n    110\n  ],\n  \"vol_matrix\": [\n    [\n      0.28,\n      0.26,\n      0.24,\n      0.25,\n      0.27\n    ],\n    [\n      0.27,\n      0.25,\n      0.23,\n      0.24,\n      0.26\n    ],\n    [\n      0.26,\n      0.24,\n      0.22,\n      0.23,\n      0.25\n    ]\n  ],\n  \"query_expiry\": 0.5,\n  \"query_strikes\": [\n    92,\n    97,\n    102,\n    107\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fincept.in/quantlib/volatility/surface/smile")

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

request = Net::HTTP::Post.new(url)
request["X-API-Key"] = '<api-key>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"expiries\": [\n    0.25,\n    0.5,\n    1\n  ],\n  \"strikes\": [\n    90,\n    95,\n    100,\n    105,\n    110\n  ],\n  \"vol_matrix\": [\n    [\n      0.28,\n      0.26,\n      0.24,\n      0.25,\n      0.27\n    ],\n    [\n      0.27,\n      0.25,\n      0.23,\n      0.24,\n      0.26\n    ],\n    [\n      0.26,\n      0.24,\n      0.22,\n      0.23,\n      0.25\n    ]\n  ],\n  \"query_expiry\": 0.5,\n  \"query_strikes\": [\n    92,\n    97,\n    102,\n    107\n  ]\n}"

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

{
  "success": true,
  "data": {
    "expiry": 0.5,
    "smile": [
      {
        "strike": 92,
        "volatility": 0.262
      },
      {
        "strike": 97,
        "volatility": 0.244
      },
      {
        "strike": 102,
        "volatility": 0.236
      },
      {
        "strike": 107,
        "volatility": 0.249
      }
    ]
  }
}

{
  "detail": "Invalid API key"
}

{
  "detail": "Endpoint requires Standard tier or higher"
}

{
  "detail": [
    {
      "loc": [
        "body",
        "volatility"
      ],
      "msg": "field required",
      "type": "value_error.missing"
    }
  ]
}