# Assess in 30 mins with Amber Coster

> A direct, no-pressure conversation about what's going on in your business to assess whether I'm the right person to help. Best for founders and CEOs of scaling B2B SaaS who've outgrown their operating model — you have to be everywhere, good ideas happen but rarely turn to outcomes, everything's feeling a bit... messy. We'll cover: what's holding things back, what "good" looks like, and the right next step. If I'm not the fit, I'll say so. No deck, no pitch. Bring the real problem.

- Host: Amber Coster
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/London
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/ambercoster/30min
- Event type id: 6321960

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6321960&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": 6321960,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "guests": [
    "guest@example.com"
  ],
  "bookingFieldsResponses": {
    "notes": "…"
  }
}
```

- Required fields: `name` (Your name), `email` (Email address)
- Optional fields: `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.