# 30 Min Discovery Call with Dominik Mészáros

> Let's chat about how we can help you. 👉 Say hello 👉 Discuss your goals 👉 Answer any questions 👉 Set next steps

- Host: Dominik Mészáros
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Bratislava
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/fackt/30min
- Event type id: 818759

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=818759&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": 818759,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "title": "…",
    "What-can-we-help-with": "…",
    "notes": "…",
    "budget": "…",
    "Where-did-you-find-us": "…",
    "smsReminderNumber": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `title` (Website/app link (If applicable)*), `What-can-we-help-with` (What can we help with?), `notes` (What business challenge are you looking to solve?), `budget` (What type of budget have you allocated for this project?), `Where-did-you-find-us` (Where did you find us?), `smsReminderNumber` (Phone number (Text notifications))
- 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.