# XO Demo with Stelios Papadopoulos

> Choose a time that works best for you to explore what we’re building at XO—from product to vision to what’s coming next. Whether you’re curious, evaluating, or ready to collaborate, we’d love to connect.

- Host: Stelios Papadopoulos
- Duration: 30 min
- Location: Google Meet
- Host time zone: Asia/Nicosia
- Confirmation: The host confirms each booking; it stays pending until they accept it.
- Booking page: https://cal.com/steliospaps/xo-demo
- Event type id: 2291491

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=2291491&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": 2291491,
  "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)
- Optional fields: `title` (What is this meeting about?), `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.