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Use the expand query parameter to embed related data inline in the response instead of fetching it with a second request. Depending on the endpoint this is either a referenced object (a room type’s hotel, expanded from its hotelId) or a related collection (a hotel’s roomTypes). Nothing is expanded by default. 
# Embed each hotel's room types
GET /api/v2/hotels?expand=roomTypes

# Embed each room type's hotel
GET /api/v2/room-types?expand=hotel

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With and without expand

A hotel does not include its room types by default. Without expand you get the hotel on its own; with expand=roomTypes the full roomTypes array is embedded inline — no second request needed. The only difference between the two responses is the added roomTypes block. 
{
  "id": "66f16191f739705faa020001",
  "name": { "cs-CZ": "Pawlik", "de": "Pawlik-Aquaforum" },
  "stars": 4,
  "address": {
    "addressLine": "Americká 384/26",
    "city": "Františkovy Lázně",
    "postalCode": "351 01",
    "countryCode": "CZ"
  },
  "phoneNumber": "+420 354 401 111",
  "description": { "cs-CZ": "Lázeňský hotel u pramene.", "de": "Kurhotel an der Quelle." },
  "commercialSlogan": { "cs-CZ": "Wellness pobyt.", "de": "Wellnessaufenthalt." },
  "equipment": { "cs-CZ": "Sauna, vnitřní bazén.", "de": "Sauna, Innenpool." },
  "services": { "cs-CZ": "Lázeňské procedury.", "de": "Kuranwendungen." },
  "images": [
    { "url": "https://files.example/pawlik.jpg", "thumbnailUrl": "https://files.example/pawlik-thumb.webp" }
  ],
  "priceFrom": {
    "CZK": {
      "perNight": { "amountMinor": 200000, "currency": "CZK", "currencyExponent": 2 },
      "perNightOriginal": { "amountMinor": 250000, "currency": "CZK", "currencyExponent": 2 },
      "minimumStay": { "amountMinor": 400000, "currency": "CZK", "currencyExponent": 2 },
      "minimumStayOriginal": { "amountMinor": 500000, "currency": "CZK", "currencyExponent": 2 },
      "guests": 2,
      "minimumNights": 2
    },
    "EUR": {
      "perNight": { "amountMinor": 8000, "currency": "EUR", "currencyExponent": 2 },
      "perNightOriginal": null,
      "minimumStay": { "amountMinor": 16000, "currency": "EUR", "currencyExponent": 2 },
      "minimumStayOriginal": null,
      "guests": 2,
      "minimumNights": 2
    }
  }
}
The same pattern applies in the other direction: GET /api/v2/room-types?expand=hotel embeds each room type’s hotel. For a paginated, filterable list of a single hotel’s room types, use GET /api/v2/room-types?hotelId=<id> instead of expanding. Each endpoint lists the expand values it supports and what each adds.