# Échange Osmosia with Osmosia

> Un échange pour comprendre votre gestion des leads et vous montrer concrètement ce qu'Osmosia change. On regarde vos délais de réponse actuels et ce qu'ils vous coûtent, puis vous voyez la solution en fonctionnement. Pas de présentation commerciale, pas d'engagement.

- Host: Osmosia
- Duration: 30 min
- Location: Google Meet
- Host time zone: Europe/Paris
- Confirmation: Bookings are confirmed instantly.
- Booking page: https://cal.com/pierre-osmont/echange-osmosia
- Event type id: 6251801

## Check availability

```http
GET https://api.cal.com/v2/slots?eventTypeId=6251801&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": 6251801,
  "start": "<UTC ISO 8601 start from the slots response>",
  "attendee": {
    "name": "…",
    "email": "…",
    "timeZone": "<IANA time zone>"
  },
  "bookingFieldsResponses": {
    "Boutique-leboncoin": "…"
  }
}
```

- Required fields: `email` (Email address), `name` (Your name)
- Optional fields: `Boutique-leboncoin` (Boutique leboncoin)
- `name` and `email` go in `attendee` and `guests` is a list of emails; every other field goes in `bookingFieldsResponses` under its name.