# 30-min Growth Call with Martin

> A focused call to discuss: • Your goals + targets • Current performance and growth blockers • Where we can help improve results Trusted by brands like Juicy Couture DELSEY bbhugme Lisa Yang derschutze Boxbollen Chihiros Aquatic Studio Awake Boards VEJRHØJ

- Host: Martin
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Madrid
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/martin-advicio/30min
- Event type id: 4616668

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4616668&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": 4616668,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "goal": "…",
    "Channel-focus": "…",
    "ad_spend": "…",
    "website_url": "…",
    "source": "…",
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address), `goal` (What are you trying to improve?), `Channel-focus` (Where are you running ads?), `ad_spend` (Monthly ad spend (approx.)), `website_url` (Website / store URL)
- Optional fields: `source` (Where did you hear about us?), `notes` (Additional notes), `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.