curl --request GET \
  --url https://api.kas.fyi/v1/blocks/{hash} \
  --header 'x-api-key: <api-key>'

import requests

url = "https://api.kas.fyi/v1/blocks/{hash}"

headers = {"x-api-key": "<api-key>"}

response = requests.get(url, headers=headers)

print(response.text)

const options = {method: 'GET', headers: {'x-api-key': '<api-key>'}};

fetch('https://api.kas.fyi/v1/blocks/{hash}', 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.kas.fyi/v1/blocks/{hash}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "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"
	"net/http"
	"io"
)

func main() {

	url := "https://api.kas.fyi/v1/blocks/{hash}"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("x-api-key", "<api-key>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.kas.fyi/v1/blocks/{hash}")
  .header("x-api-key", "<api-key>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.kas.fyi/v1/blocks/{hash}")

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

request = Net::HTTP::Get.new(url)
request["x-api-key"] = '<api-key>'

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

{
  "block": {
    "hash": "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f",
    "acceptedIdMerkleRoot": "6a58371f3b3ead073b801ef01d9483949e327433551cd7acd4fb120fa50107d4",
    "difficulty": 507406243542504400,
    "isChainBlock": true,
    "mergeSetBluesHashes": [
      "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f"
    ],
    "mergeSetRedsHashes": [
      "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f"
    ],
    "selectedParentHash": "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f",
    "bits": 420621680,
    "blueScore": 198182682,
    "blueWork": "000000000000000000000000001aac71f3a8e677ec782921",
    "daaScore": 199879592,
    "hashMerkleRoot": "4033b49e51c2fd1ddf067b3c6f94f7b1b228baccfe8134a0c875b7d24c5df06f",
    "nonce": "2463154641575365871",
    "parents": [
      "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f"
    ],
    "pruningPoint": "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f",
    "timestamp": "2025-08-17T05:30:42.577Z",
    "utxoCommitment": "493dd3d15378745ea44dab81fd702eb35b9330f27f971e0eb1792ef4583b6dae",
    "version": 1,
    "transactionIds": [
      "f123bed13d88bc18236d977c0035267d0054b912170fe4ae619e93306685d2af"
    ]
  },
  "transactions": [
    {
      "transactionId": "a7177c55769381a56c126e458c8bb6046613b8a8d45c2f8d3ca5dc71a065279a",
      "blockTime": 1749531022210,
      "subnetworkId": "0000000000000000000000000000000000000000",
      "hash": "f123bed13d88bc18236d977c0035267d0054b912170fe4ae619e93306685d2af",
      "mass": "2036",
      "blockHashes": [
        "30ab8f5ac54c8aa9cbf9a69209a2061e7123293efc40630136c970abef59450b",
        "f97afb6794c56e0bb283ea6a38cc51cc41303a055ef9376e707139928cffa588"
      ],
      "acceptingBlockHash": "2a0c51fab2a7c7a187299e087a244d1e70acdc75e0214a661c62761e2d6bbf4f",
      "isAccepted": true,
      "confirmations": 10,
      "payload": "0x",
      "inputs": [
        {
          "transactionId": "a7177c55769381a56c126e458c8bb6046613b8a8d45c2f8d3ca5dc71a065279a",
          "index": 0,
          "signatureScript": "4183faed776b7f1b1ed32b97aafe3069ee357c80b637f5069ab859916a896ec69a59e9bebcc3e646587d59376a40c72dd0290f8ebdbf0b64f13e2d8f81d0fe106301",
          "sigOpCount": 1,
          "previousOutput": {
            "transactionId": "a7177c55769381a56c126e458c8bb6046613b8a8d45c2f8d3ca5dc71a065279a",
            "index": 0,
            "amount": "31112708372",
            "scriptPublicKey": "2010fdab002cff0ac15bfc8b982c5a616bef9e5a66f0c655f4f63f7d1cef39d2b4ac",
            "scriptPublicKeyAddress": "kaspa:qqg0m2cq9nls4s2mlj9estz6v947l8j6vmcvv4057clh688088ftg7ce6p895",
            "scriptPublicKeyType": "pubkey"
          }
        }
      ],
      "outputs": [
        {
          "transactionId": "a7177c55769381a56c126e458c8bb6046613b8a8d45c2f8d3ca5dc71a065279a",
          "index": 0,
          "amount": "31112708372",
          "scriptPublicKey": "2010fdab002cff0ac15bfc8b982c5a616bef9e5a66f0c655f4f63f7d1cef39d2b4ac",
          "scriptPublicKeyAddress": "kaspa:qqg0m2cq9nls4s2mlj9estz6v947l8j6vmcvv4057clh688088ftg7ce6p895",
          "scriptPublicKeyType": "pubkey"
        }
      ]
    }
  ]
}