# 30 min consultation & feedback with Alex Oppenheimer

> Why this costs money I got into investing on the back of something simpler: I like spending time with founders. Working through the problem, helping them figure out how to say what they're doing in terms the business world actually cares about. The investing came after that, not before it. People reach out for that all the time, and I want to make it available — but I also need to make it worth my time. So this is what it is. This is not a pitch meeting. I'm not charging you to pitch me. If it turns into an investment down the road, great — and I'll refund you. If you don't feel I was helpful, I'll refund you. And if I don't feel I gave you the full force of it, I'll refund you (or we can reschedule). What I can help with. Company positioning, product feedback, business model review, financial concepts deep dive, metrics analysis, investor targeting (not intros), fundraising strategy, pricing. What I can’t help with. Homework - I am not doing work outside our meeting time. I will not make investor or customer intros as a service. (I’m sure there’s more - I’ll add it here as it comes up).

- Host: Alex Oppenheimer
- Duration: 30 min
- Location: Zoom Video
- Host time zone: Asia/Jerusalem
- Confirmation: Bookings are confirmed instantly.
- Payment: required, and collected on the booking page.
- Booking page: https://cal.com/alexopp/30min
- Event type id: 6748579

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6748579&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": 6748579,
  "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` (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.