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

# API Health Check

> Returns the current server timestamp.<br/><br/>Available from&#58; <Badge color="gray">Sandbox</Badge><br/>Cost&#58; <Badge color="surface">Free</Badge>

<Note>
  No API key required.
</Note>

<Tip>
  Use it to verify the API is reachable and to measure response latency before sending production requests.
</Tip>


## OpenAPI

````yaml https://api.cryptorank.io/v3/documentation-json get /v3/ping
openapi: 3.0.0
info:
  title: Cryptorank API V3
  description: >
    # Overview


    Cryptorank Public API v3 — comprehensive cryptocurrency data for B2B clients
    and partners.


    Useful Links:

    - [API Plans](https://cryptorank.io/public-api)

    - [Dashboard](https://cryptorank.io/public-api/dashboard)


    # Getting Started


    Primary Server URL:
    [https://api.cryptorank.io/v3/](https://api.cryptorank.io/v3/)


    **Authentication**


    Generate an API key in the
    [dashboard](https://cryptorank.io/public-api/dashboard) and pass it in the
    `X-Api-Key` header.


    Keep your keys secret — never commit them to public repositories or expose
    them in client-side code.
  version: 3.0.0
  contact:
    name: Cryptorank Team
    url: https://cryptorank.io
    email: info@cryptorank.io
servers:
  - url: https://api.cryptorank.io
security: []
tags: []
paths:
  /v3/ping:
    get:
      tags:
        - System
      summary: API Health Check
      description: >-
        **Description**


        Returns the current server timestamp.


        > **Note:** No API key required.


        > **Tip:** Use it to verify the API is reachable and to measure response
        latency before sending production requests.


        **Access**

        - Available from: **Sandbox**

        - Cost: Free
      operationId: SystemController_ping
      parameters: []
      responses:
        '200':
          description: ''
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PingResponseDto'
components:
  schemas:
    PingResponseDto:
      type: object
      properties:
        serverTime:
          type: number
          description: Current server time. Unix timestamp in milliseconds
          example: 1780000000000
      required:
        - serverTime

````