Get a block header by height

GET

https://sei-tendermint.nownodes.io/header

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns the block header at the requested height, or the latest header when height is omitted.

Parameters

heightintegerquery

Block height as a decimal value; omit optional height to query the latest state.

Response

200OK

Response returned by the live Sei endpoint.

400Bad Request

Invalid request.

500Internal Server Error

Error

Get a block header by height

curl -X GET 'https://sei-tendermint.nownodes.io/header'

const response = await fetch('https://sei-tendermint.nownodes.io/header', {
  method: 'GET',
});

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://sei-tendermint.nownodes.io/header')
request = Net::HTTP::Get.new(uri)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

import requests

response = requests.get('https://sei-tendermint.nownodes.io/header')
data = response.json()

const response = await fetch('https://sei-tendermint.nownodes.io/header', {
  method: 'GET',
});

const data = await response.json();

const endpoint = "https://sei-tendermint.nownodes.io/header";
const apiKey = "YOUR_API_KEY";

async function nownodesRequest(payload) {
  const response = await fetch(endpoint, {
    method: "GET",
    headers: {
      "Content-Type": "application/json",
      "api-key": apiKey,
    },
    body: JSON.stringify(payload),
  });

  return response.json();
}

const result = await nownodesRequest({});
console.log(result);

const response = await fetch('https://sei-tendermint.nownodes.io/header', {
  method: 'GET',
});

const data = await response.json();

import requests

response = requests.get('https://sei-tendermint.nownodes.io/header')
data = response.json()

require 'net/http'
require 'json'

uri = URI('https://sei-tendermint.nownodes.io/header')
request = Net::HTTP::Get.new(uri)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) { |http| http.request(request) }
data = JSON.parse(response.body)

{
  "header": {
    "version": {
      "block": "11",
      "app": "0"
    },
    "chain_id": "pacific-1",
    "height": "233842496",
    "time": "2026-09-24T11:14:35.632451401Z",
    "last_block_id": {
      "hash": "2AF8634643C78442DC5CB64616133DE832B352F5DCB434A2B313EB813CA19130",
      "parts": {
        "total": 1,
        "hash": "B7775A12F23AF0B7393C5F12B87EE1E0768C42691276CD55F3C1733914410883"
      }
    },
    "last_commit_hash": "2D0D9FD90DC60D574527CDE4D2DA890C8EAFC825A6F83B0E2CD35B029429AB73",
    "data_hash": "3313785EB9F9004087F27B103DDEEF52F9AEDE0B09CD97D885973EB7181BAAA2",
    "validators_hash": "89F6363C479F2CFE9CF318CF5713B9DB2346AAB180F36116D4115F960F4A46CC",
    "next_validators_hash": "89F6363C479F2CFE9CF318CF5713B9DB2346AAB180F36116D4115F960F4A46CC",
    "consensus_hash": "1E24CCFFDC895ED64854A10BA401678BE9403E3CCD8752EEF8A901BB7EA07A20",
    "app_hash": "9AB1E7C926ED23F439ABC5803833097D5181220BE3F3BBAF26D0C899D45B3E38",
    "last_results_hash": "B073B1F15BF89CA2721B9A92608D2314F780877DAA2B86D2A67D09830DF8B67D",
    "evidence_hash": "E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855",
    "proposer_address": "00D66A1CB50A2473D8F011D369ADB117A527072D"
  }
}

{
  "message": "Invalid request."
}

{
  "id": 0,
  "jsonrpc": "string",
  "error": "string"
}