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POST
eth_blockNumber
curl --request POST \
  --url https://tempo-moderato.core.chainstack.com/a25a421add2280d53fdbc23417055501/ \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_blockNumber",
  "params": [],
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}
Tempo API method that returns the latest block number of the blockchain. A block number is a hexadecimal number representing the block’s position in the blockchain.
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Tempo produces blocks approximately every 0.5 seconds with sub-second finality using Simplex Consensus.

​
Parameters

  • none

​
Response

  • result — the integer value of the node’s latest block number encoded as hexadecimal.

​
eth_blockNumber code examples

const Web3 = require("web3");
const NODE_URL = "CHAINSTACK_NODE_URL";
const web3 = new Web3(NODE_URL);

async function getLatestBlockNumber() {
  const block = await web3.eth.getBlockNumber();
  console.log(`Latest block: ${block}`);
}

getLatestBlockNumber()

​
Use case

Tempo has sub-second block times (~0.5 seconds), making it ideal for applications that need to track real-time payment status. A DApp can use the current block number to determine when a payment transaction has been finalized.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_blockNumber
​
params
any[]
​
id
integer
default:1

Response

200 - application/json

The block number information

​
jsonrpc
string
​
id
integer
​
result
string

The latest block number encoded as hexadecimal

Last modified on January 23, 2026