> ## Documentation Index
> Fetch the complete documentation index at: https://docs.blockscout.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Get Latest Block Number (JSON-RPC Format)

> Mimics Ethereum JSON RPC's eth_blockNumber



## OpenAPI

````yaml /openapi-specs/jsonrpc-endpoints.yaml get /?module=block&action=eth_block_number
openapi: 3.1.0
info:
  title: Blockscout RPC API
  version: 1.0.0
  description: >
    Blockscout is an open-source blockchain explorer for Ethereum-based
    networks.


    This API is provided for developers transitioning applications from
    Etherscan to Blockscout 

    and applications requiring general API and data support. It supports GET and
    POST requests.


    ## Authentication


    **API keys are OPTIONAL** for all RPC endpoints. The API works without
    authentication but has different rate limits:


    - **Without API key:** 5 requests per second (shared pool across all users)

    - **With API key:** 10 requests per second per key (dedicated limit)

    - **Free tier:** Up to 3 API keys per account at no cost


    To use an API key, add `apikey=YOUR_API_KEY` to the query string:

    ```

    https://eth.blockscout.com/api?module=account&action=balance&address=0x123...&apikey=YOUR_API_KEY

    ```


    ## Base URL Format

    URLs vary by instance. With typical installations, access the API by adding
    `/api` to the end 

    of the instance URL.


    **Example:** `https://eth-sepolia.blockscout.com/api`


    ## Query Format


    ### RPC API (Module/Action format)

    An example query includes a module and action(s)/parameters:

    ```

    https://eth-sepolia.blockscout.com/api?module=account&action=balance&address=0x123...

    ```


    ### ETH RPC API (JSON-RPC format)

    Standard Ethereum JSON-RPC methods use POST requests to `/api/eth-rpc`:

    ```

    POST https://eth.blockscout.com/api/eth-rpc

    Content-Type: application/json


    {"jsonrpc":"2.0","method":"eth_blockNumber","params":[],"id":1}

    ```


    Note: API keys can also be used with ETH RPC endpoints by adding
    `?apikey=YOUR_API_KEY` to the URL.
  license:
    name: MIT
    url: https://opensource.org/licenses/MIT
  contact:
    name: Blockscout Community
    url: https://discord.gg/blockscout
servers:
  - url: https://eth.blockscout.com/api
    description: Ethereum Mainnet Explorer (RPC API)
  - url: https://eth-sepolia.blockscout.com/api
    description: Ethereum Sepolia Testnet Explorer (RPC API)
  - url: https://base.blockscout.com/api
    description: Base Mainnet Explorer (RPC API)
  - url: https://optimism.blockscout.com/api
    description: Optimism Mainnet Explorer (RPC API)
  - url: https://gnosis.blockscout.com/api
    description: Gnosis Chain Explorer (RPC API)
security:
  - {}
tags:
  - name: Account
    description: Account-related endpoints
  - name: Block
    description: Block-related endpoints
  - name: Contract
    description: Smart contract-related endpoints
  - name: Logs
    description: Event logs endpoints
  - name: Stats
    description: Network statistics endpoints
  - name: Token
    description: Token-related endpoints
  - name: Transaction
    description: Transaction-related endpoints
  - name: ETH RPC
    description: Ethereum JSON-RPC compatible endpoints
externalDocs:
  url: https://docs.blockscout.com/devs/apis/rpc
paths:
  /?module=block&action=eth_block_number:
    get:
      tags:
        - Block
      summary: Get Latest Block Number (JSON-RPC Format)
      description: Mimics Ethereum JSON RPC's eth_blockNumber
      operationId: eth-block-number
      parameters:
        - $ref: '#/components/parameters/module_block'
        - $ref: '#/components/parameters/action_eth_block_number'
      responses:
        '200':
          description: Latest block number retrieved successfully
          content:
            application/json:
              schema:
                type: object
                properties:
                  jsonrpc:
                    type: string
                    example: '2.0'
                  result:
                    type: string
                    description: Block number in hex format
                    example: '0x103538a'
                  id:
                    type: integer
                    example: 1
      externalDocs:
        url: https://docs.blockscout.com/devs/apis/rpc/block
components:
  parameters:
    module_block:
      name: module
      in: query
      required: true
      schema:
        type: string
        enum:
          - block
      description: Module name (must be 'block')
    action_eth_block_number:
      name: action
      in: query
      required: true
      schema:
        type: string
        enum:
          - eth_block_number

````