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

# GET /head

> Returns the slot number and hash of the highest block available in the dataset, or null if no blocks are available. Takes real-time data into account. Useful for diagnotics.



## OpenAPI

````yaml /api-reference/openapi.yaml get /head
openapi: 3.1.0
info:
  title: SQD Network Portal API - Dataset Endpoints
  description: >-
    API endpoints for interacting with datasets under the SQD Network Portal,
    specifically for the solana-mainnet dataset.
  version: 1.0.0
servers:
  - url: https://portal.sqd.dev/datasets/solana-mainnet
security: []
paths:
  /head:
    get:
      description: >-
        Returns the slot number and hash of the highest block available in the
        dataset, or null if no blocks are available. Takes real-time data into
        account. Useful for diagnotics.
      responses:
        '200':
          description: Highest block information
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/BlockHead'
components:
  schemas:
    BlockHead:
      type: object
      properties:
        number:
          type: integer
          format: int64
          description: Slot number of the highest available block
        hash:
          type: string
      nullable: true

````