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POST
/
efb0a5eccd2caa5135eb54eba6f7f300
eth_blockNumber
curl --request POST \
  --url https://optimism-mainnet.core.chainstack.com/efb0a5eccd2caa5135eb54eba6f7f300 \
  --header 'Content-Type: application/json' \
  --data '
{
  "jsonrpc": "2.0",
  "method": "eth_blockNumber",
  "id": 1
}
'
{
  "jsonrpc": "<string>",
  "id": 123,
  "result": "<string>"
}

Documentation Index

Fetch the complete documentation index at: https://docs.chainstack.com/llms.txt

Use this file to discover all available pages before exploring further.

Optimism 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. For example, the block number 0x69B5B means that the block is block 432987 in the blockchain.
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​
Parameters

  • none

​
Response

  • result — the integer value of the node’s latest block number is synced to, encoded as hexadecimal. The block number is used to identify the block’s position in the blockchain and is updated every time a new block is added to the chain.

​
Use case

A possible use case for the eth_blockNumber method in Optimism is for applications that need to be aware of the current block number—some applications may need to be mindful of the current block number to function correctly. For example, a DApp may use the current block number to determine the expiration date of a time-limited offer.

Body

application/json
​
jsonrpc
string
default:2.0
​
method
string
default:eth_blockNumber
​
id
integer
default:1

Response

200 - application/json

The block number information

​
jsonrpc
string
​
id
integer
​
result
string
Last modified on May 18, 2026