# Onboarding Call with Vast Studios

> Let's discuss your project and explore how we can help bring your vision to life. This 30-minute call is an opportunity for us to understand your needs, answer your questions, and determine if we're the right fit for your project. We'll cover your goals, timeline, budget, and how our team can support you. Your input is extremely valuable and helps us tailor our approach to best serve you.

- Host: Vast Studios
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/vaststudios/30min
- Event type id: 4121539

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4121539&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": 4121539,
  "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.