# 20-min BuildBox Demo with Brenden Melanson

> 20-min BuildBox Demo

- Host: Brenden Melanson
- Duration: 20 min
- Location: Google Meet
- Host time zone: America/Vancouver
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/buildbox/20-min-buildbox-demo
- Event type id: 5153137

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=5153137&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": 5153137,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "company": "…",
    "lead_source": "…",
    "attendeePhoneNumber": "…",
    "role": "…",
    "team_size": "…",
    "scope_of_work": "…",
    "pain_points": "…",
    "other_details": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `company` (Company name), `lead_source` (How did you hear about us?)
- Optional fields: `attendeePhoneNumber` (Phone number), `role` (What's your role?), `team_size` (How big is your team?), `scope_of_work` (What trade are you in?), `pain_points` (What's your biggest headache right now?), `other_details` (If you picked Other, tell us more), `notes` (Anything you want me to know before the call?)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.