# Free 30-minute Growth Diagnostic with Jan Nafta

> A free 30-minute call about your paid acquisition. Before the call I go through what's public (your site, your app store listing if you have one, the ad libraries and your tracking tags) and prepare a short pre-read as a PDF or video. On the call I walk you through the three biggest opportunities I see and the next step I would take. Most teams I work with spend $10K or more a month on ads, but anyone can book.

- Host: Jan Nafta
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Madrid
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/jannafta/growth-diagnosis
- Event type id: 7333490

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7333490&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": 7333490,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "website": "…",
    "monthly_ad_spend": "…",
    "channels": "…",
    "goal": "…",
    "notes": "…",
    "referral": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `website` (Company website), `monthly_ad_spend` (Monthly ad spend), `channels` (Channels you run today), `goal` (Main goal for the next 90 days)
- Optional fields: `notes` (Additional notes), `guests` (Add guests), `referral` (How did you find me?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.