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CHECK24

Travelby CHECK24 GmbH
Launched May 21, 2026 on ChatGPT

Germany’s largest comparison portal is now on ChatGPT.

Compare hotels, package vacations, flights, rental cars, tires, mobile plans and insurance directly in the chat, and find the right offer. With just one click, you can view all details and conveniently complete your booking or purchase on CHECK24.

More comparisons coming soon—add the CHECK24 app and start saving today.

12ChatGPT Tools
CHECK24 GmbHDeveloper
TravelCategory

Available Tools

Chatgpt Tools-search Moto Tires

chatgpt_tools-search_moto_tires
Full Description

Search for motorcycle tires: either by tire size (e.g. 110/80 R16 or 3.50-12) or by motorcycle (brand, model, optionally cylinder capacity and production year). For bike-based search: only brand and model are required; ccm and Baujahr are optional and often implied or clarified via disambiguation (multiple bikes -> user chooses one, then pass bike_id on next call). Returns matching motorcycle tires.

Parameters (3 required)
Required
bike_id_paramsobject

Follow-up after disambiguation: pass bike_id from the previous result's disambiguation_options together with the tire_search_mode from the original search.

bike_paramsobject

Search by motorcycle (model required; brand, cylinder capacity and production year optional). Leave empty when searching by dimensions or by bike_id_params.

dimension_paramsobject

Search by tire dimensions (width, optional height, diameter). For mm (e.g. 110/80 R16) or inch (e.g. 3.50-12). Always returns single tires, not sets.

Chatgpt Tools-search Rims

chatgpt_tools-search_rims
Full Description

Nutze das Tool um nach Felgen zu suchen. Frage dafür nach den Fahrzeugdaten des Nutzers. Nutze das Tool auch, wenn bisher nur ein Teil der Parameter gegeben ist, die Tool Response hilft dann die weitere Auswahl von Fahrzeugen einzuschränken. Alternativ kann auch die Schlüsselnummer zur Suche (HSN, TSN, VSN) genutzt werden. Wenn das Fahrzeug des Kunden eindeutig identifiziert ist, werden dem Kunden garantiert passende Felgen für sein Auto angezeigt.

Parameters (4 required)
Required
rim_search_parametersobject

Optional filter parameters for rim search

vehicle_dataobject

Optional features of the car to identify it. If vehicle_key_number is not provided, manufacturer_name and car_body_model are required for model search. Otherwise, use to refine/filter results.

vehicle_id_paramsobject

Follow-up after disambiguation: user chose a specific vehicle from the previous result's disambiguation_options. Use this when the previous search returned disambiguation_options. Use this ONLY if the customer gave a uniquely identifying answer for one vehicle id

vehicle_key_numberobject

Search by vehicle key number (HSN, TSN, VSN). If not provided, vehicle_data with manufacturer_name and car_body_model is required for model search.

Chatgpt Tools-search Tires

chatgpt_tools-search_tires
Full Description

Reifensuche anhand von Größe, Saison und Filtern. Ergebnisse kommen im Reifen-Widget. Setze nur die Parameter, die der Benutzer explizit angegeben hat.

Parameters (18 required)
Required
diameterinteger

Tire diameter filter (e.g., 16, 17, 18)

euFuelEfficiencystring

EU fuel efficiency rating: 'A', 'B', 'C', 'D', 'E'. Always also shows better performing tires. Null for no filter.

euNoisestring

EU noise rating: 'A', 'B', 'C'. Always also shows better performing tires. Null for no filter.

euWetGripstring

EU wet grip rating: 'A', 'B', 'C', 'D', 'E'. Always also shows better performing tires. Null for no filter.

featuresarray

Tire features filter (rimProtection, reinforced, offroad, forElectricVehicle) & emergencyFeatures (runflat, seal)

gradeV2string

Minimum tire grade filter: 'okay', 'satisfactory', 'good', 'very_good', 'fabulous', 'outstanding', 'excellent'. Null for no filter.

heightinteger

Tire height/aspect ratio filter (e.g., 55, 60)

loadIndexinteger

Load index filter (e.g., 91, 95, 100)

maxPriceinteger

Maximum price filter in cents

minPriceinteger

Minimum price filter in cents

pageinteger

Page number for pagination (default: 1)

postalCodestring

Zip code for delivery location. Only needed if the user wants to book a fitting appointment, so we can search for fitting stations nearby.

seasonarray

Tire season filter (sommerreifen, winterreifen, ganzjahresreifen)

sortstring

Sort order: 'popularity' (default), 'priceAsc' for cheapest, 'grade' for best rated. Use 'priceAsc' ONLY when specifically requested ('cheaper than 90€' should be done with filter, not sort!)

speedIndexstring

Speed index filter (e.g., H, V, W, Y)

tireBrandarray

Tire brand filter as lowercase slug (e.g., michelin, continental)

tireBrandTypearray

Tire brand type filter (premium, brand, budget, budget_low)

widthinteger

Tire width filter (e.g., 205, 225)

Flight-mcpd-show Flight Offers

flight-mcpd-showFlightOffers
Full Description

Use this tool when the user wants to search for flight offers. The tool performs a flight search for one-way, round-trip and open-jaw searches. One-way: departure/arrival airport for trip 1, departure date, number of passengers. Round-trip: departure/arrival airport for trip 1, departure date for trip 1, departure date for trip 2 (returnDate), number of passengers. Open jaw: departure/arrival airport for trip 1 and 2, departure date for trip 1 and 2, number of passengers. The search can be filtered (by luggage, stopovers and/or airline) and ordered (by price, time or pdi). The tool returns available flight offers and displays them directly in an integrated slider view, including departure and arrival dates and times, airlines, stopovers, flight duration, brief baggage information and prices.

Parameters (13 required)
Required
adultsinteger

Number of adults (1-9). Required. Default: 1.

carrierstring

IATA code of the airline (e.g. LH, BA). Null = no filter.

childreninteger

Number of children (0-8). Default: 0.

departure_datestring

Departure date YYYY-MM-DD. Required.

destination_airportstring

IATA code for arrival airport (e.g. JFK, LHR). Required.

infantsinteger

Number of infants (0-8). Default: 0.

luggagestring

exclude: no luggage; inclusive: with luggage. Optional.

orderstring

Sort order: time, price or pdi. Default: pdi.

Options:timepricepdi
origin_airportstring

IATA code for departure airport (e.g. FRA, MUC). Required.

return_datestring

Return date YYYY-MM-DD. Null for one-way.

return_destination_airportstring

IATA code for return trip destination (open jaw). Null for one-way/round-trip.

return_origin_airportstring

IATA code for return trip origin (open jaw). Null for one-way/round-trip.

transfer_countstring

Filter by stops (e.g. 0 for direct). Null = no filter.

Hotel-get-hotel-description

hotel-get-hotel-description
Full Description

This tool returns extended hotel information to display in the fullscreen overlay.

Parameters (1 required)
Required
hotelIdnumber

Hotel-get-hotel-pois

hotel-get-hotel-pois
Full Description

This tool returns points of interest near the selected hotel.

Parameters (1 required)
Required
hotelIdnumber

Hotel-get-hotel-reviews

hotel-get-hotel-reviews
Full Description

This tool returns customer reviews and ratings for the selected hotel.

Parameters (1 required)
Required
hotelIdnumber

Hotel-search-hotels

hotel-search-hotels
Full Description

Use this tool when the user wants to search for and explore different types of accommodations for a trip. The tool performs an accommodation search for a specified location with geographic coordinates (latitude and longitude of the location must always be provided), future travel dates, and room occupancy (rooms, number of adults, children including ages). Optional parameters such as minimum and maximum price (minPrice, maxPrice) can be applied to restrict results to a specific budget range. Prices are in Euro. In addition, natural-language user preferences (e.g., “4 Sterne Hotel mit Frühstück” or “Günstiges Hotel in Zentrumsnähe”) are automatically matched against available search filters and applied accordingly. The tool returns available accommodation options and displays them directly in an integrated slider view, including prices, photos, and guest ratings. Use this tool for accommodation discovery, availability checks, budget filtering and visual exploration, where search and result presentation are combined in a single step.

Parameters (11 required)
Required
arrivalDatestring

Start date for the hotel search

departureDatestring

End date for the hotel search

hotelIdstring/null
hotelNamestring/null
latitudenumber/null

Latitude of the location to search hotels for

locationNamestring

Name of the location to search hotels for

longitudenumber/null

Longitude of the location to search hotels for

maxPricenumber/null
minPricenumber/null
roomConfigurationarray

List of rooms

userPreferencesstring/null

Pauschalreise-travel Search Packages

pauschalreise-travel_search_packages
Full Description

[travel] Search package holidays (flight + hotel) worldwide. Departures from Germany only.

Required: Destination, dates (min. tomorrow), duration, travelers. Optional: Budget, board type, rating, amenities, airport. Note: Departure min. tomorrow. Booking via Check24.

Golden Prompt Examples (USE THIS TOOL FOR):

  • "Finde Pauschalreisen nach Mallorca im Juli 2025"
  • "Günstige Pauschalreisen nach Türkei unter 800€ All-Inclusive"
  • "Familienurlaub nach Italien für 2 Erwachsene und 2 Kinder (8, 10 Jahre)"
  • "Warme Pauschalreisen im Winter am Meer"
  • "Urlaub nach Griechenland mit Flug und Hotel"
  • "All-Inclusive nach Ägypten im Sommer"
  • "Familienurlaub nach Spanien"
  • "Pauschalreise nach Thailand ab München"

Negative Examples (DO NOT use this tool for):

  • "Finde Hotels in Berlin ohne Flug"
  • "Suche Flüge nach Mallorca"
  • "Was gibt es in Barcelona zu sehen?"
  • "Ferienhaus mieten auf Mallorca"
  • "Pauschalreisen ab New York nach Cancun"
  • "Package holidays from London to Spain"
Parameters (1 required)
Required
querystring

Natural language package holiday search query (flight + hotel) based on user wording; keep intent and constraints, avoid inventing specific dates or constraints.

Production-get Insurance Advice

Production-get_insurance_advice
Full Description

Use this tool when a user wants to get general insurance advice. The tool performs a search for insurance recommendations for the user based on their individual life situation, which relies on three infos that must always be provided: the users martial status, their type of health insurance and whether they own residential property or not. Optional parameters are which insurance products the user already has to restrict recommendation results to only missing insurances. The tool will return insurance recommendations matching the users values and displays them in an integrated slider view, with a photo, insurance description, price range and links to product comparison landing pages. Use it to provide an easily comprehensible insurance recommendation overview to the user.

Parameters (4 required)
Required
familyStatusstring

Family status of the user. Family means the user has kids

Options:SinglePartnerschaftFamilie
healthInsurancestring

Type of users health insurance

Options:gesetzlichprivat
productsarray

List that defines all insurances owned by the customer, should be an empty Array if customer does not have insurance

propertystring

User owns property or not

Options:janein

Rentalcar-gpt-search-rentalcar

rentalcar-gpt-search-rentalcar
Full Description

*Purpose:* Use this tool when a customer wants to search, rent, or book a rental car. It can start a new search, adjust an existing search, sort offers, and apply filters.

*Capabilities:*

  • Start a new rental-car search.
  • Adjust an existing search (e.g., change dates, locations, car class).
  • Sort offers by one of: price, rating, renter_rating, popularity.
  • Apply filters via the filter parameter.

*Filter parameter (guidelines):*

  • Provide a short, plain-language summary of all desired criteria in the filter field.
  • Be concise; separate criteria with commas.

*Notes:*

  • If no specific filters are requested, leave filter empty.
  • Sorting options accepted exactly as: price, rating, renter_rating, popularity.
Parameters (10 required)
Required
agenumber

The age of the main driver of the rentalcar.

dropoff_datestring

The dropoff date of the rentalcar.

dropoff_locationstring

The dropoff location of the rentalcar.

dropoff_timestring

The dropoff time of the rentalcar - if no time is specified by the customer set to 10:00

filterstring

A text which includes all the criteria the customer wants so filter for in their rentalcar search.

pickup_datestring

The pickup date of the rentalcar.

pickup_locationstring

The pickup location of the rentalcar.

pickup_timestring

The pickup time of the rentalcar - if no time is specified by the customer set to 12:00

search_identifierstring

The search_identifier. Only present, when adjusting an existing search.

sort_keystring

The sorting of the offers - default sort_key ist 'popularity'

Sim-only-bot-search Result List Chat Gpt V3

sim-only-bot-searchResultListChatGptV3
Full Description

Use this tool when a customer is looking for specific mobile tariffs, e.g., "günstige Tarife mit viel Datenvolumen" or "5G Tarife unter 30 Euro".

Parameters (5 required)
Required
contextstring

Der Kontext der Tarifsuche. Standard: "sim". Mögliche Werte: "sim" für Vertragstarife oder "prepaid" für Prepaid-Tarife.

currentCompareLeadIdnumber/null

Die ID des aktuellen Vergleichs-Leads. Optional. Wird verwendet, um profitable comparison zu aktivieren.

profitableComparisonTokenstring/null

Das Token für profitable comparison. Optional. Wird für anonyme Benutzer benötigt, um Zugriff auf das Vergleichs-Lead zu validieren.

sharedIdentifierstring/null

Die gemeinsame Identifikationsnummer für anonyme Benutzer. Optional. Dieser Wert sollte aus dem pageContext abgerufen werden. Wird verwendet, um Anfragen von anonymen Benutzern zu identifizieren. Format: UUID. Beispiel: "b12702fa-352a-474a-97cd-4181eb5e7fe0"

smartQuerystring

Die natürliche Sprachanfrage zur Tarifsuche. Pflichtfeld. Beispiel: "günstige Tarife mit viel Datenvolumen" oder "5G Tarife unter 30 Euro"