# Free Infrastructure Assessment — TrySelfHost with TrySelfHost

> A free 30-minute call to look at your current SaaS stack and work out whether self-hosted infrastructure makes sense for your situation. We'll cover: — What you're currently paying and what's replaceable — What the migration would involve for your specific setup — Realistic costs, timeline, and what ongoing operations looks like No pitch. No obligation. Just a direct technical conversation with an actual answer at the end. If it's not a good fit, we'll tell you that too.

- Host: TrySelfHost
- Duration: 30 min
- Location: TrySelfHost Strategy Call
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/tryselfhost/strategy-call
- Event type id: 4307933

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=4307933&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": 4307933,
  "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.