# Erfan Hassanzadeh – Cal.com booking page

> Distribution & marketing for founders who built a product but can't get users.


Booking page: https://cal.com/erfandigital

## Event types

- [Intro Call](https://cal.com/erfandigital/15min): 15 min, confirmed instantly, event type id 6739612. A 15-minute call to understand what you're building and where you're stuck with growth or distribution. No pitch, just a quick look at your product and one or two concrete next steps. Details: https://cal.com/erfandigital/15min.md
- [Strategy Call](https://cal.com/erfandigital/30min): 30 min, confirmed instantly, event type id 6739610. A 30-minute deeper strategy session to go through your growth plan, marketing decisions, or a specific bottleneck in getting users. Details: https://cal.com/erfandigital/30min.md

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=<event type id>&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

Each event type's `.md` document lists its required booking fields and the `POST https://api.cal.com/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

- API docs: https://cal.com/docs/api-reference/v2/introduction