# TOLVYN – Cal.com booking page

> Founder of TOLVYN — financial infrastructure for AI API spend.

I do 15-minute live demos: sign up → add your OpenAI key →
make a real request → watch costs appear in real time.
No slides. No pitch. Just the product working.

If your team is spending on AI APIs and you don't know
where it's going, this is for you.

tolvyn.io

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

## Event types

- [15 min meeting](https://cal.com/tolvyn/15min): 15 min, confirmed instantly, event type id 5149540. Details: https://cal.com/tolvyn/15min.md
- [30 min meeting](https://cal.com/tolvyn/30min): 30 min, confirmed instantly, event type id 5149541. Details: https://cal.com/tolvyn/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