wget --no-check-certificate --quiet \
  --method POST \
  --timeout=0 \
  --header 'Content-Type: application/json' \
  --header 'accept: application/json' \
  --header 'X-CoinAPI-Key: 4303fb63-adec-42dc-b571-74bc2f2a5167' \
  --body-data '{"jsonrpc":"2.0","id":1,"method":"getblock","params": [ ]}' \
   'https://bitcoin-mainnet.node.coinapi.io'

var client = new HttpClient();
var request = new HttpRequestMessage(HttpMethod.Post, "https://bitcoin-mainnet.node.coinapi.io");
request.Headers.Add("x-coinapi-key", "73034021-THIS-IS-SAMPLE-KEY");
request.Headers.Add("accept", "application/json");
var content = new StringContent("{\"jsonrpc\":\"2.0\",\"method\":\"getblock\",\"params\": [],\"id\":1}", null, "application/json");
request.Content = content;
var response = await client.SendAsync(request);
response.EnsureSuccessStatusCode();
Console.WriteLine(await response.Content.ReadAsStringAsync());

<?php
$client = new Client();
$headers = [
  'x-coinapi-key' => '73034021-THIS-IS-SAMPLE-KEY',
  'Content-Type' => 'application/json',
  'accept' => 'application/json'
];
$body = '{
  "jsonrpc": "2.0",
  "method": "getblock",
  "params": [],
  "id": 1
}';
$request = new Request('POST', 'https://bitcoin-mainnet.node.coinapi.io', $headers, $body);
$res = $client->sendAsync($request)->wait();
echo $res->getBody();
?>

import requests
import json

url = "https://bitcoin-mainnet.node.coinapi.io"

payload = json.dumps({
  "jsonrpc": "2.0",
  "method": "getblock",
  "params": [],
  "id": 1
})
headers = {
  'x-coinapi-key': '73034021-THIS-IS-SAMPLE-KEY',
  'Content-Type': 'application/json',
  'accept': 'application/json'
}

response = requests.request("POST", url, headers=headers, data=payload)

print(response.text)

var settings = {
  "url": "https://bitcoin-mainnet.node.coinapi.io",
  "method": "POST",
  "timeout": 0,
  "headers": {
    "x-coinapi-key": "4303fb63-adec-42dc-b571-74bc2f2a5167",
    "Content-Type": "application/json",
    "accept": "application/json"
  },
  "data": JSON.stringify({
    "jsonrpc": "2.0",
    "method": "getblock",
    "params": [],
    "id": 1
  }),
};

$.ajax(settings).done(function (response) {
  console.log(response);
});

package main

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

func main() {

  url := "https://bitcoin-mainnet.node.coinapi.io"
  method := "POST"

  payload := strings.NewReader(`{"jsonrpc":"2.0","method":"getblock","params": [],"id":1}`)

  client := &http.Client {
  }
  req, err := http.NewRequest(method, url, payload)

  if err != nil {
    fmt.Println(err)
    return
  }
  req.Header.Add("x-coinapi-key", "73034021-THIS-IS-SAMPLE-KEY")
  req.Header.Add("Content-Type", "application/json")
  req.Header.Add("accept", "application/json")

  res, err := client.Do(req)
  if err != nil {
    fmt.Println(err)
    return
  }
  defer res.Body.Close()

  body, err := ioutil.ReadAll(res.Body)
  if err != nil {
    fmt.Println(err)
    return
  }
  fmt.Println(string(body))
}

require "uri"
require "json"
require "net/http"

url = URI("https://bitcoin-mainnet.node.coinapi.io")

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

request = Net::HTTP::Post.new(url)
request["x-coinapi-key"] = "73034021-THIS-IS-SAMPLE-KEY"
request["Content-Type"] = "application/json"
request["accept"] = "application/json"
request.body = JSON.dump({
  "jsonrpc": "2.0",
  "method": "getblock",
  "params": [],
  "id": 1
})

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

OkHttpClient client = new OkHttpClient().newBuilder().build();
MediaType mediaType = MediaType.parse("application/json");
RequestBody body = RequestBody.create(mediaType, "{\r\n  \"jsonrpc\": \"2.0\",\r\n  \"id\": \"1\",\r\n  \"method\": \"getblock\",\r\n  \"params\": []\r\n}\r\n");
Request request = new Request.Builder()
  .url("https://bitcoin-mainnet.node.coinapi.io")
  .method("POST", body)
  .addHeader("Content-Type", "application/json")
  .addHeader("accept", "application/json")
  .addHeader("X-CoinAPI-Key", "73034021-THIS-IS-SAMPLE-KEY")
  .build();
Response response = client.newCall(request).execute();

{
    "result": null,
    "error": {
        "code": -1,
        "message": "getblock \"blockhash\" ( verbosity )\n\nIf verbosity is 0, returns a string that is serialized, hex-encoded data for block 'hash'.\nIf verbosity is 1, returns an Object with information about block <hash>.\nIf verbosity is 2, returns an Object with information about block <hash> and information about each transaction.\nIf verbosity is 3, returns an Object with information about block <hash> and information about each transaction, including prevout information for inputs (only for unpruned blocks in the current best chain).\n\nArguments:\n1. blockhash    (string, required) The block hash\n2. verbosity    (numeric, optional, default=1) 0 for hex-encoded data, 1 for a JSON object, 2 for JSON object with transaction data, and 3 for JSON object with transaction data including prevout information for inputs\n\nResult (for verbosity = 0):\n\"hex\"    (string) A string that is serialized, hex-encoded data for block 'hash'\n\nResult (for verbosity = 1):\n{                                 (json object)\n  \"hash\" : \"hex\",                 (string) the block hash (same as provided)\n  \"confirmations\" : n,            (numeric) The number of confirmations, or -1 if the block is not on the main chain\n  \"size\" : n,                     (numeric) The block size\n  \"strippedsize\" : n,             (numeric) The block size excluding witness data\n  \"weight\" : n,                   (numeric) The block weight as defined in BIP 141\n  \"height\" : n,                   (numeric) The block height or index\n  \"version\" : n,                  (numeric) The block version\n  \"versionHex\" : \"hex\",           (string) The block version formatted in hexadecimal\n  \"merkleroot\" : \"hex\",           (string) The merkle root\n  \"tx\" : [                        (json array) The transaction ids\n    \"hex\",                        (string) The transaction id\n    ...\n  ],\n  \"time\" : xxx,                   (numeric) The block time expressed in UNIX epoch time\n  \"mediantime\" : xxx,             (numeric) The median block time expressed in UNIX epoch time\n  \"nonce\" : n,                    (numeric) The nonce\n  \"bits\" : \"hex\",                 (string) The bits\n  \"difficulty\" : n,               (numeric) The difficulty\n  \"chainwork\" : \"hex\",            (string) Expected number of hashes required to produce the chain up to this block (in hex)\n  \"nTx\" : n,                      (numeric) The number of transactions in the block\n  \"previousblockhash\" : \"hex\",    (string, optional) The hash of the previous block (if available)\n  \"nextblockhash\" : \"hex\"         (string, optional) The hash of the next block (if available)\n}\n\nResult (for verbosity = 2):\n{                   (json object)\n  ...,              Same output as verbosity = 1\n  \"tx\" : [          (json array)\n    {               (json object)\n      ...,          The transactions in the format of the getrawtransaction RPC. Different from verbosity = 1 \"tx\" result\n      \"fee\" : n     (numeric) The transaction fee in BTC, omitted if block undo data is not available\n    },\n    ...\n  ]\n}\n\nResult (for verbosity = 3):\n{                                        (json object)\n  ...,                                   Same output as verbosity = 2\n  \"tx\" : [                               (json array)\n    {                                    (json object)\n      \"vin\" : [                          (json array)\n        {                                (json object)\n          ...,                           The same output as verbosity = 2\n          \"prevout\" : {                  (json object) (Only if undo information is available)\n            \"generated\" : true|false,    (boolean) Coinbase or not\n            \"height\" : n,                (numeric) The height of the prevout\n            \"value\" : n,                 (numeric) The value in BTC\n            \"scriptPubKey\" : {           (json object)\n              \"asm\" : \"str\",             (string) The asm\n              \"hex\" : \"str\",             (string) The hex\n              \"address\" : \"str\",         (string, optional) The Bitcoin address (only if a well-defined address exists)\n              \"type\" : \"str\"             (string) The type (one of: nonstandard, pubkey, pubkeyhash, scripthash, multisig, nulldata, witness_v0_scripthash, witness_v0_keyhash, witness_v1_taproot, witness_unknown)\n            }\n          }\n        },\n        ...\n      ]\n    },\n    ...\n  ]\n}\n\nExamples:\n> bitcoin-cli getblock \"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"\n> curl --user myusername --data-binary '{\"jsonrpc\": \"1.0\", \"id\": \"curltest\", \"method\": \"getblock\", \"params\": [\"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09\"]}' -H 'content-type: text/plain;' http://127.0.0.1:8332/\n"
    },
    "id": 1
}