# Book a demo with Nishkarsh

> HydraDB is the graph-native context infrastructure for AI. It is the data layer that gives agents the ability to remember, reason, and generate responses across millions of documents, conversations, and context from workplace apps. You can create company brains, enterprise ontologies, and your own memory layers using HydraDB. Currently it ranks #1 on LongMemEval, FinanceBench, and BEAM. At its core, it is a graph database built on object storage, making it 10x cheaper, extremely fast, and capable of handling millions of agent requests per second.

- Host: Nishkarsh
- Duration: 30 min
- Location: Zoom Video
- Host time zone: America/Los_Angeles
- Confirmation: The host confirms each booking; it stays pending until they accept it.
- Booking page: https://cal.com/nish-sri/book-a-demo
- Event type id: 5012683

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5012683&start=YYYY-MM-DD&end=YYYY-MM-DD&timeZone=<IANA time zone>
cal-api-version: 2024-09-04
```

The response is `{"data":{"YYYY-MM-DD":[{"start":"<ISO 8601 with offset>"}]}}`; no API key is needed.

## Book

```http
POST https://api.cal.com/v2/bookings
cal-api-version: 2026-02-25
Content-Type: application/json

{
  "eventTypeId": 5012683,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?)
- Optional fields: `guests` (Add guests)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- A successful response is a pending booking request.