curl --request POST \
     --url https://ethereum-mainnet-geth-archive.node.coinapi.io \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --header 'X-CoinAPI-Key: 73034021-THIS-IS-SAMPLE-KEY' \
     --data '
    {
      "id": 1,
      "jsonrpc": "2.0",
      "method": "net_version"
    }'

using RestSharp; {

      var options = new RestClientOptions("https://ethereum-mainnet-geth-archive.node.coinapi.io");
      var client = new RestClient(options);
      var request = new RestRequest("");
      request.AddHeader("accept", "application/json","X-CoinAPI-Key: 73034021-THIS-IS-SAMPLE-KEY");
      request.AddJsonBody("{\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"net_version\"}", false);
      var response = await client.PostAsync(request);

Console.WriteLine("{0}", response.Content); }

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://ethereum-mainnet-geth-archive.node.coinapi.io",
  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([
    'id' => 1,
    'jsonrpc' => '2.0',
    'method' => 'net_version'
  ]),
  CURLOPT_HTTPHEADER => [
    "accept: application/json",
    "content-type: application/json",
    "X-CoinAPI-Key": "73034021-THIS-IS-SAMPLE-KEY"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}
?>

import requests

url = "https://ethereum-mainnet-geth-archive.node.coinapi.io"

payload = {
  "id": 1,
  "jsonrpc": "2.0",
  "method": "net_version"
}
headers = {
  "accept": "application/json",
  "content-type": "application/json",
  "X-CoinAPI-Key" : "73034021-THIS-IS-SAMPLE-KEY"
}

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

print(response.text)

const options = {
  method: 'POST',
  headers: {accept: 'application/json', 'content-type': 'application/json', 'X-CoinAPI-Key': '73034021-THIS-IS-SAMPLE-KEY'},
  body: JSON.stringify({id: 1, jsonrpc: '2.0', method: 'net_version'})
};

fetch('https://ethereum-mainnet-geth-archive.node.coinapi.io', options)
  .then(response => response.json())
  .then(response => console.log(response))
  .catch(err => console.error(err));

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://ethereum-mainnet-geth-archive.node.coinapi.io"

	payload := strings.NewReader("{\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"net_version\"}")

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

	req.Header.Add("accept", "application/json")
	req.Header.Add("content-type", "application/json")
  req.Header.Add("X-CoinAPI-Key", "73034021-THIS-IS-SAMPLE-KEY")

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

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

	fmt.Println(string(body))
}

require 'uri'
require 'net/http'

url = URI("https://ethereum-mainnet-geth-archive.node.coinapi.io")

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

request = Net::HTTP::Post.new(url)
request["accept"] = 'application/json'
request["content-type"] = 'application/json'
request["X-CoinAPI-Key"] = '73034021-THIS-IS-SAMPLE-KEY'
request.body = {\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"net_version\"}

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

OkHttpClient client = new OkHttpClient();
{
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\"id\":1,\"jsonrpc\":\"2.0\",\"method\":\"net_version\"}");
Request request = new Request.Builder()
  .url("https://ethereum-mainnet-geth-archive.node.coinapi.io")
  .post(body)
  .addHeader("accept", "application/json")
  .addHeader("content-type", "application/json")
  .addHeader("X-CoinAPI-Key", "73034021-THIS-IS-SAMPLE-KEY")
  .build();

Response response = client.newCall(request).execute();
}

{
  "jsonrpc": "2.0",
  "id": 1,
  "result": []
}