# 15min Free Intro Call with Alexander Estner

> What you can expect from our call: A brief discussion about your current situation and key challenges An overview of how I typically support SaaS founders The goal: Get to know each other and explore whether there’s a mutual fit to work together.

- Host: Alexander Estner
- Duration: 15 min
- Location: Google Meet
- Host time zone: Europe/Berlin
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/alexander-estner/15min-free-intro-call
- Event type id: 349020

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=349020&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": 349020,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "reason-for-meeting": "…",
    "company-website": "…",
    "current-revenue": "…",
    "challenges": "…",
    "Source": "…",
    "Preperation": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `reason-for-meeting` (What is the reason for the call?), `company-website` (What is the website of your company?), `current-revenue` (What is the current stage of your company?), `challenges` (What are your top 3 challenges right now (where you need help)?), `Source` (How did you hear about me?)
- Optional fields: `Preperation` (Please share anything that will help prepare for our meeting.), `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.