List block headers

GET

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

Authorizations

ApiKeyAuthApiKeyAuth

api-key string

NOWNodes API key passed in the api-key header.

Returns up to 20 block headers between the requested minimum and maximum heights in descending order.

Parameters

minHeightintegerquery

Lowest block height in the requested range, inclusive.

maxHeightintegerquery

Highest block height in the requested range, inclusive.

Response

200OK

Response returned by the live Sei endpoint.

400Bad Request

Invalid request.

500Internal Server Error

Error

List block headers

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

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

const data = await response.json();

require 'net/http'
require 'json'

uri = URI('https://sei-tendermint.nownodes.io/blockchain')
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/blockchain')
data = response.json()

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

const data = await response.json();

const endpoint = "https://sei-tendermint.nownodes.io/blockchain";
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/blockchain', {
  method: 'GET',
});

const data = await response.json();

import requests

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

require 'net/http'
require 'json'

uri = URI('https://sei-tendermint.nownodes.io/blockchain')
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)

{
  "last_height": "233842503",
  "block_metas": [
    {
      "block_id": {
        "hash": "5C7A393701F191D58B78DF6C59614CEE6D57435F3811B5C94035CC9F3D71F591",
        "parts": {
          "total": 1,
          "hash": "475A71BBC2BC5C16701C629FDADD0C41E425D734E6CCF58A8771112E3C11A356"
        }
      },
      "block_size": "5683",
      "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"
      },
      "num_txs": "2"
    }
  ]
}

{
  "message": "Invalid request."
}

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