# 15 min Intro call with Daniel Brett

> I've spent 15+ years in construction and design-build. I started The Level Head because I kept seeing homeowners get burned by bids they didn't fully understand — and that's a problem I can actually fix. This call is simple: tell me about your project, I'll tell you if and how I can help. No pitch, no pressure.

- Host: Daniel Brett
- Duration: 15 min
- Location: Google Meet
- Host time zone: America/Los_Angeles
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/thelevelhead/15min
- Event type id: 5033725

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5033725&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": 5033725,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…",
    "heard_about_us": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `notes` (Please tell me about your project), `heard_about_us` (How did you find me?)
- Optional fields: `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.