# Validation Deep Dive with Dmitry Trofimets

> A 2-hour intensive session to build your 60-day action plan to first sales. This is a focused, hands-on working session designed to eliminate defocus and create a clear, actionable roadmap to validate your startup idea. What you will get: A pre-session checklist to organize your existing research and assumptions. A live, 2-hour collaborative workshop to diagnose your core risks and opportunities. A concrete, one-page Action Plan outlining the specific validation steps for the next 60 days. The clarity and confidence to stop wasting time and focus on what will actually drive revenue. This session is designed to be the highest-ROI investment you can make at this stage. It is a small price to pay to avoid the #1 mistake that kills 42% of startups: spending months and thousands of dollars building a product nobody wants. P.S. If you decide to continue with my monthly tracking program after our session, the full $500 fee will be credited towards your first month.

- Host: Dmitry Trofimets
- Duration: 120 min
- Location: Google Meet
- Host time zone: Europe/Belgrade
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/dowhatmatter/deep-dive
- Event type id: 394058

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=394058&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": 394058,
  "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` (What do I need to know before a session?), `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.