get_block_header_by_height - Monero

Example code for the get_block_header_by_height JSON-RPC method. Complete guide on how to use get_block_header_by_height JSON-RPC in GetBlock Web3 documentation.

This method returns the header of a block at a given height. Functionally similar to get_block_header_by_hash but indexed by height.

Parameters

Parameter	Type	Required	Description
height	unsigned int	Yes	Height of the block whose header to return

Request Example

cURL

curl --location --request POST 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/' \
--header 'Content-Type: application/json' \
--data-raw '{
    "jsonrpc": "2.0",
    "method": "get_block_header_by_height",
    "params": {
        "height": 912345
    },
    "id": "getblock.io"
}'

JavaScript (Axios)

import axios from 'axios';

const data = JSON.stringify({
    "jsonrpc": "2.0",
    "method": "get_block_header_by_height",
    "params": {
        "height": 912345
    },
    "id": "getblock.io"
});

const config = {
    method: 'post',
    url: 'https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/',
    headers: {
        'Content-Type': 'application/json'
    },
    data: data
};

axios(config)
    .then(response => console.log(JSON.stringify(response.data, null, 2)))
    .catch(error => console.log(error));

Python (Requests)

import requests
import json

url = "https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/"

payload = json.dumps({
    "jsonrpc": "2.0",
    "method": "get_block_header_by_height",
    "params": {
        "height": 912345
    },
    "id": "getblock.io"
})

headers = {
    'Content-Type': 'application/json'
}

response = requests.post(url, headers=headers, data=payload)
print(response.text)

Rust (Reqwest)

use reqwest::Client;
use serde_json::json;

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
    let client = Client::new();

    let payload = json!({
        "jsonrpc": "2.0",
        "method": "get_block_header_by_height",
        "params": {
                "height": 912345
        },
        "id": "getblock.io"
});

    let response = client
        .post("https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/")
        .header("Content-Type", "application/json")
        .json(&payload)
        .send()
        .await?;

    let result: serde_json::Value = response.json().await?;
    println!("{:#?}", result);

    Ok(())
}

Response Example

{
    "id": "getblock.io",
    "jsonrpc": "2.0",
    "result": {
        "block_header": {
            "block_size": 5500,
            "depth": 100,
            "difficulty": 294558564173,
            "hash": "e22cf75f39ae720e8b71b3d120a5ac03f0db50bba6379e2850975b4859190bc6",
            "height": 912345,
            "major_version": 7,
            "minor_version": 7,
            "nonce": 1234567890,
            "num_txes": 12,
            "orphan_status": false,
            "prev_hash": "37155cae7d3aa8ca7dc8b9e69e0d1f64b5e3a8b1c2d9e4f5a6b7c8d9e0f1a2b3",
            "reward": 1500000000000,
            "timestamp": 1452793716
        },
        "status": "OK",
        "untrusted": false
    }
}

Response Parameters

Field	Type	Description
result.block_header.height	unsigned int	Block height (echoed back)
result.block_header.hash	string	Block hash at this height
result.block_header.timestamp	unsigned int	Unix timestamp
result.block_header.reward	unsigned int	Coinbase reward in atomic units

Use Cases

• Resolving header metadata from a known height

• Block-by-block iteration in indexers

• Computing block-time intervals

Error Handling

Status Code	Error Message	Cause
403	Forbidden	Missing or invalid <ACCESS-TOKEN>
-32602	Invalid params	Request parameters are missing or malformed
429	Too Many Requests	Rate limit exceeded for your plan

SDK Integration

monero-javascript

import monerojs from 'monero-javascript';

const daemon = await monerojs.connectToDaemonRpc('https://shared.eu-central-1.getblock.io/<ACCESS-TOKEN>/');

// Most methods are exposed directly on the daemon client. For raw access:
const result = await daemon.getDaemonConnection().sendJsonRequest('get_block_header_by_height', {"height": 912345});
console.log(result);

monero-python

from monero.backends.jsonrpc import JSONRPCDaemon
from monero.daemon import Daemon

backend = JSONRPCDaemon(host='shared.eu-central-1.getblock.io', port=443, path='/<ACCESS-TOKEN>/', protocol='https')
daemon = Daemon(backend)

# For methods covered by the typed API, use the daemon attribute directly.
# For raw RPC access:
result = backend.raw_request('get_block_header_by_height', {"height": 912345})
print(result)