# Chat with Mehdi @kuartz with kuartz Studio

> One click away from the best design among your competitors. Clients include: ClickUP $4B+ Whop $300M+ Framer $162M+

- Host: kuartz Studio
- Duration: 15, 30, 60 min
- Location: Google Meet
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/kuartz/15min
- Event type id: 3091092

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=3091092&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": 3091092,
  "start": "<UTC ISO 8601 start from the slots response>",
  "lengthInMinutes": 30,
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "attendeePhoneNumber": "…",
    "website": "…",
    "services": "…",
    "budget": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email)
- Optional fields: `attendeePhoneNumber` (Phone / Whatsapp?), `guests` (Add guests), `website` (Current website?), `services` (What kind of services are you interested in?), `budget` (Do you already have a budget range in mind?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.
- `lengthInMinutes` picks one of 15, 30, 60; pass the same value to the slots request as `duration`.