# Martin Stahl – Cal.com booking page

> Former Chief Product Officer and Organisational Consultant with a proven track record of over 15 years in Berlin's startup ecosystem.


I work at the intersection of product development, resilient organisations, and systemic change - helping ICs and leaders build the structures and habits that let them do their best work. EN/DE.

More info on Martin

Booking page: https://cal.eu/stahl

## Event types

- [30 Minuten Termin](https://cal.eu/stahl/30min): 30 min, confirmed instantly, event type id 223351. Details: https://cal.eu/stahl/30min.md
- [15 Minuten Termin](https://cal.eu/stahl/15min): 15 min, confirmed instantly, event type id 223350. Details: https://cal.eu/stahl/15min.md

## Check availability

```http
GET https://api.cal.eu/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.eu/v2/bookings` request (`cal-api-version: 2026-02-25`).

## More

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