# Startup Universe with George Krachtopoulos

> Let me introduce you to Startup Universe! Startup Universe is a non-profit initiative connecting early-stage startups worldwide - especially in developing economies - with the best minds of the global tech community. We are proud to support and connect 600+ early-stage startups with the brightest minds of the diaspora, late-stage founders, angel investors, corporates, and experts through our 14 National Programs.

- Host: George Krachtopoulos
- Duration: 20 min
- Location: Mountain Plaza Hotel - Lobby(formerly Sunstar)
- Host time zone: Europe/Athens
- Confirmation: The host confirms each booking; it stays pending until they accept it.
- Booking page: https://cal.com/georgekrax/startup-universe
- Event type id: 291402

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=291402&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": 291402,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `notes` (Additional notes), `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.