# Free 30-minute trial lesson with FocusMath

> A free 30-minute one-on-one math session. We'll find out where your child actually is with math and work on something real. You're welcome to sit in for the whole session. Have their math textbook or notebook nearby — nothing else needed.

- Host: FocusMath
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Chisinau
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/focusmath/free-trial
- Event type id: 7499762

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=7499762&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": 7499762,
  "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.