curl --request POST \
  --url https://api.ionworks.com/ecm/fit-from-measurements \
  --header 'Content-Type: application/json' \
  --data '
{
  "measurements": [
    {
      "id": "<string>",
      "start_step": 123,
      "end_step": 123,
      "initial_soc": 0.5,
      "capacity": 1
    }
  ],
  "ecm_options": {
    "num_rcs": 2,
    "fit_ocv": true,
    "capacity": 1,
    "regularization": 0,
    "ocv_soc_curve": {
      "soc": [
        123
      ],
      "ocv": [
        123
      ]
    },
    "bounds_capacity": {
      "lo": 123,
      "hi": 123
    },
    "num_knots": 32,
    "num_knots_r0": 32,
    "knot_schedule": [
      123
    ],
    "clamp_boundary_knots": true,
    "clamp_max_ratio": 10
  }
}
'

import requests

url = "https://api.ionworks.com/ecm/fit-from-measurements"

payload = {
    "measurements": [
        {
            "id": "<string>",
            "start_step": 123,
            "end_step": 123,
            "initial_soc": 0.5,
            "capacity": 1
        }
    ],
    "ecm_options": {
        "num_rcs": 2,
        "fit_ocv": True,
        "capacity": 1,
        "regularization": 0,
        "ocv_soc_curve": {
            "soc": [123],
            "ocv": [123]
        },
        "bounds_capacity": {
            "lo": 123,
            "hi": 123
        },
        "num_knots": 32,
        "num_knots_r0": 32,
        "knot_schedule": [123],
        "clamp_boundary_knots": True,
        "clamp_max_ratio": 10
    }
}
headers = {"Content-Type": "application/json"}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {'Content-Type': 'application/json'},
  body: JSON.stringify({
    measurements: [
      {id: '<string>', start_step: 123, end_step: 123, initial_soc: 0.5, capacity: 1}
    ],
    ecm_options: {
      num_rcs: 2,
      fit_ocv: true,
      capacity: 1,
      regularization: 0,
      ocv_soc_curve: {soc: [123], ocv: [123]},
      bounds_capacity: {lo: 123, hi: 123},
      num_knots: 32,
      num_knots_r0: 32,
      knot_schedule: [123],
      clamp_boundary_knots: true,
      clamp_max_ratio: 10
    }
  })
};

fetch('https://api.ionworks.com/ecm/fit-from-measurements', 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.ionworks.com/ecm/fit-from-measurements",
  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([
    'measurements' => [
        [
                'id' => '<string>',
                'start_step' => 123,
                'end_step' => 123,
                'initial_soc' => 0.5,
                'capacity' => 1
        ]
    ],
    'ecm_options' => [
        'num_rcs' => 2,
        'fit_ocv' => true,
        'capacity' => 1,
        'regularization' => 0,
        'ocv_soc_curve' => [
                'soc' => [
                                123
                ],
                'ocv' => [
                                123
                ]
        ],
        'bounds_capacity' => [
                'lo' => 123,
                'hi' => 123
        ],
        'num_knots' => 32,
        'num_knots_r0' => 32,
        'knot_schedule' => [
                123
        ],
        'clamp_boundary_knots' => true,
        'clamp_max_ratio' => 10
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($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.ionworks.com/ecm/fit-from-measurements"

	payload := strings.NewReader("{\n  \"measurements\": [\n    {\n      \"id\": \"<string>\",\n      \"start_step\": 123,\n      \"end_step\": 123,\n      \"initial_soc\": 0.5,\n      \"capacity\": 1\n    }\n  ],\n  \"ecm_options\": {\n    \"num_rcs\": 2,\n    \"fit_ocv\": true,\n    \"capacity\": 1,\n    \"regularization\": 0,\n    \"ocv_soc_curve\": {\n      \"soc\": [\n        123\n      ],\n      \"ocv\": [\n        123\n      ]\n    },\n    \"bounds_capacity\": {\n      \"lo\": 123,\n      \"hi\": 123\n    },\n    \"num_knots\": 32,\n    \"num_knots_r0\": 32,\n    \"knot_schedule\": [\n      123\n    ],\n    \"clamp_boundary_knots\": true,\n    \"clamp_max_ratio\": 10\n  }\n}")

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

	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.ionworks.com/ecm/fit-from-measurements")
  .header("Content-Type", "application/json")
  .body("{\n  \"measurements\": [\n    {\n      \"id\": \"<string>\",\n      \"start_step\": 123,\n      \"end_step\": 123,\n      \"initial_soc\": 0.5,\n      \"capacity\": 1\n    }\n  ],\n  \"ecm_options\": {\n    \"num_rcs\": 2,\n    \"fit_ocv\": true,\n    \"capacity\": 1,\n    \"regularization\": 0,\n    \"ocv_soc_curve\": {\n      \"soc\": [\n        123\n      ],\n      \"ocv\": [\n        123\n      ]\n    },\n    \"bounds_capacity\": {\n      \"lo\": 123,\n      \"hi\": 123\n    },\n    \"num_knots\": 32,\n    \"num_knots_r0\": 32,\n    \"knot_schedule\": [\n      123\n    ],\n    \"clamp_boundary_knots\": true,\n    \"clamp_max_ratio\": 10\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.ionworks.com/ecm/fit-from-measurements")

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

request = Net::HTTP::Post.new(url)
request["Content-Type"] = 'application/json'
request.body = "{\n  \"measurements\": [\n    {\n      \"id\": \"<string>\",\n      \"start_step\": 123,\n      \"end_step\": 123,\n      \"initial_soc\": 0.5,\n      \"capacity\": 1\n    }\n  ],\n  \"ecm_options\": {\n    \"num_rcs\": 2,\n    \"fit_ocv\": true,\n    \"capacity\": 1,\n    \"regularization\": 0,\n    \"ocv_soc_curve\": {\n      \"soc\": [\n        123\n      ],\n      \"ocv\": [\n        123\n      ]\n    },\n    \"bounds_capacity\": {\n      \"lo\": 123,\n      \"hi\": 123\n    },\n    \"num_knots\": 32,\n    \"num_knots_r0\": 32,\n    \"knot_schedule\": [\n      123\n    ],\n    \"clamp_boundary_knots\": true,\n    \"clamp_max_ratio\": 10\n  }\n}"

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

{
  "detail": [
    {
      "loc": [
        "<string>"
      ],
      "msg": "<string>",
      "type": "<string>",
      "input": "<unknown>",
      "ctx": {}
    }
  ]
}