curl --request POST \
  --url https://api.ionworks.com/ecm/save-to-project \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "cell_spec_id": "<string>",
  "num_rcs": 2,
  "fit_results": {
    "soc": [
      123
    ],
    "ocv": [
      123
    ],
    "r0": [
      123
    ],
    "rc_pairs": [
      {
        "r": [
          123
        ],
        "c": [
          123
        ],
        "tau": [
          123
        ]
      }
    ],
    "capacity_Ah": [
      123
    ]
  },
  "description": ""
}
'

import requests

url = "https://api.ionworks.com/ecm/save-to-project"

payload = {
    "name": "<string>",
    "cell_spec_id": "<string>",
    "num_rcs": 2,
    "fit_results": {
        "soc": [123],
        "ocv": [123],
        "r0": [123],
        "rc_pairs": [
            {
                "r": [123],
                "c": [123],
                "tau": [123]
            }
        ],
        "capacity_Ah": [123]
    },
    "description": ""
}
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({
    name: '<string>',
    cell_spec_id: '<string>',
    num_rcs: 2,
    fit_results: {
      soc: [123],
      ocv: [123],
      r0: [123],
      rc_pairs: [{r: [123], c: [123], tau: [123]}],
      capacity_Ah: [123]
    },
    description: ''
  })
};

fetch('https://api.ionworks.com/ecm/save-to-project', 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/save-to-project",
  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([
    'name' => '<string>',
    'cell_spec_id' => '<string>',
    'num_rcs' => 2,
    'fit_results' => [
        'soc' => [
                123
        ],
        'ocv' => [
                123
        ],
        'r0' => [
                123
        ],
        'rc_pairs' => [
                [
                                'r' => [
                                                                123
                                ],
                                'c' => [
                                                                123
                                ],
                                'tau' => [
                                                                123
                                ]
                ]
        ],
        'capacity_Ah' => [
                123
        ]
    ],
    'description' => ''
  ]),
  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/save-to-project"

	payload := strings.NewReader("{\n  \"name\": \"<string>\",\n  \"cell_spec_id\": \"<string>\",\n  \"num_rcs\": 2,\n  \"fit_results\": {\n    \"soc\": [\n      123\n    ],\n    \"ocv\": [\n      123\n    ],\n    \"r0\": [\n      123\n    ],\n    \"rc_pairs\": [\n      {\n        \"r\": [\n          123\n        ],\n        \"c\": [\n          123\n        ],\n        \"tau\": [\n          123\n        ]\n      }\n    ],\n    \"capacity_Ah\": [\n      123\n    ]\n  },\n  \"description\": \"\"\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/save-to-project")
  .header("Content-Type", "application/json")
  .body("{\n  \"name\": \"<string>\",\n  \"cell_spec_id\": \"<string>\",\n  \"num_rcs\": 2,\n  \"fit_results\": {\n    \"soc\": [\n      123\n    ],\n    \"ocv\": [\n      123\n    ],\n    \"r0\": [\n      123\n    ],\n    \"rc_pairs\": [\n      {\n        \"r\": [\n          123\n        ],\n        \"c\": [\n          123\n        ],\n        \"tau\": [\n          123\n        ]\n      }\n    ],\n    \"capacity_Ah\": [\n      123\n    ]\n  },\n  \"description\": \"\"\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.ionworks.com/ecm/save-to-project")

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  \"name\": \"<string>\",\n  \"cell_spec_id\": \"<string>\",\n  \"num_rcs\": 2,\n  \"fit_results\": {\n    \"soc\": [\n      123\n    ],\n    \"ocv\": [\n      123\n    ],\n    \"r0\": [\n      123\n    ],\n    \"rc_pairs\": [\n      {\n        \"r\": [\n          123\n        ],\n        \"c\": [\n          123\n        ],\n        \"tau\": [\n          123\n        ]\n      }\n    ],\n    \"capacity_Ah\": [\n      123\n    ]\n  },\n  \"description\": \"\"\n}"

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

{
  "model_id": "<string>",
  "parameterized_model_id": "<string>"
}

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