# 30 min discovery call with KastleBlack Studio

> Discovery Call with KastleBlack A 30-minute conversation to find out more about who we are, what we do and whether we might be the right fit for your project. Come as you are. No preparation needed. To help us continuously improve and to give you the option to revisit our conversation, this call may be recorded. By completing this booking you confirm your consent to being recorded. All recordings are stored securely and kept strictly confidential. You can withdraw consent at any time before or at the start of the call by letting us know. For more information, see our Privacy Policy: https://www.kastleblack.com/privacy

- Host: KastleBlack Studio
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Sofia
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/kastleblack/discovery
- Event type id: 4951351

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4951351&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": 4951351,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (What is this meeting about?)
- 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.