# Discovery Call — Atrum Point with Dmytro Hotsul

> A 30-minute conversation with Dmytro Hotsul, founder and lead analyst at Atrum Point. By the end of the call you'll know which kind of report can answer your question, how long it takes, and what it costs. We'll confirm the scope before anything starts.

- Host: Dmytro Hotsul
- Duration: 30 min
- Location: Cal Video
- Host time zone: Europe/Kyiv
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/dmytro-hotsul/30min
- Event type id: 6614535

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6614535&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": 6614535,
  "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.