curl --request POST \
  --url https://api.fincept.in/quantlib/numerical/least-squares/fit \
  --header 'Content-Type: application/json' \
  --header 'X-API-Key: <api-key>' \
  --data '
{
  "model": "exponential_fit",
  "x_data": [
    0,
    1,
    2,
    3,
    4
  ],
  "y_data": [
    5.1,
    3.8,
    2.9,
    2.3,
    2
  ],
  "x0": [
    5,
    -0.5,
    1.5
  ]
}
'

import requests

url = "https://api.fincept.in/quantlib/numerical/least-squares/fit"

payload = {
    "model": "exponential_fit",
    "x_data": [0, 1, 2, 3, 4],
    "y_data": [5.1, 3.8, 2.9, 2.3, 2],
    "x0": [5, -0.5, 1.5]
}
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({
    model: 'exponential_fit',
    x_data: [0, 1, 2, 3, 4],
    y_data: [5.1, 3.8, 2.9, 2.3, 2],
    x0: [5, -0.5, 1.5]
  })
};

fetch('https://api.fincept.in/quantlib/numerical/least-squares/fit', 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/numerical/least-squares/fit",
  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([
    'model' => 'exponential_fit',
    'x_data' => [
        0,
        1,
        2,
        3,
        4
    ],
    'y_data' => [
        5.1,
        3.8,
        2.9,
        2.3,
        2
    ],
    'x0' => [
        5,
        -0.5,
        1.5
    ]
  ]),
  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/numerical/least-squares/fit"

	payload := strings.NewReader("{\n  \"model\": \"exponential_fit\",\n  \"x_data\": [\n    0,\n    1,\n    2,\n    3,\n    4\n  ],\n  \"y_data\": [\n    5.1,\n    3.8,\n    2.9,\n    2.3,\n    2\n  ],\n  \"x0\": [\n    5,\n    -0.5,\n    1.5\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/numerical/least-squares/fit")
  .header("X-API-Key", "<api-key>")
  .header("Content-Type", "application/json")
  .body("{\n  \"model\": \"exponential_fit\",\n  \"x_data\": [\n    0,\n    1,\n    2,\n    3,\n    4\n  ],\n  \"y_data\": [\n    5.1,\n    3.8,\n    2.9,\n    2.3,\n    2\n  ],\n  \"x0\": [\n    5,\n    -0.5,\n    1.5\n  ]\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.fincept.in/quantlib/numerical/least-squares/fit")

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  \"model\": \"exponential_fit\",\n  \"x_data\": [\n    0,\n    1,\n    2,\n    3,\n    4\n  ],\n  \"y_data\": [\n    5.1,\n    3.8,\n    2.9,\n    2.3,\n    2\n  ],\n  \"x0\": [\n    5,\n    -0.5,\n    1.5\n  ]\n}"

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

{
  "success": true,
  "data": {
    "parameters": [
      3.52,
      -0.48,
      1.62
    ],
    "cost": 0.0234,
    "iterations": 12,
    "converged": true
  }
}

{
  "detail": "Invalid API key"
}

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