How to Integrate Lovable with Realtor.com

Go to rapidapi.com and search for 'Realtor.com' or navigate directly to the Realtor.com API page (realtor-com4.p.rapidapi.com is the current version as of 2026). Click 'Subscribe to Test' to access the free tier, or choose a paid plan if you need higher request volumes. RapidAPI offers several Realtor.com API tiers. The free tier provides 100-500 requests per month — suitable for development and low-traffic apps. Paid tiers start at around $10-30/month for higher volumes. Review the available endpoints on the API page: property search, property details, autocomplete (for address input), neighborhood data, market statistics, and more. After subscribing, find your RapidAPI key on the developer dashboard at rapidapi.com/developer/dashboard. All RapidAPI keys start with a long alphanumeric string. This single key works for all APIs you subscribe to on RapidAPI — Realtor.com, Zillow, and any other RapidAPI-hosted real estate APIs you add later. Note the exact endpoint URLs and required headers from the Realtor.com API documentation page on RapidAPI. Every RapidAPI call requires two headers: X-RapidAPI-Key (your key) and X-RapidAPI-Host (the specific API host, e.g., realtor-com4.p.rapidapi.com).

In Lovable, click the '+' button next to the Preview panel to open the Cloud tab, then navigate to Secrets. Add these secrets: - RAPIDAPI_KEY: your RapidAPI developer key - REALTOR_API_HOST: the Realtor.com API host on RapidAPI (e.g., realtor-com4.p.rapidapi.com) Storing the API host as a separate secret is useful because RapidAPI periodically updates API versions — when a new version is released (e.g., realtor-com5.p.rapidapi.com), you update only the secret rather than the Edge Function code. Some developers already use RapidAPI for other services. If your RAPIDAPI_KEY is already in Cloud Secrets under a different name, reuse it — RapidAPI keys work across all subscribed APIs. You only need REALTOR_API_HOST as a Realtor.com-specific secret. Do not store these credentials in frontend code. RapidAPI keys have usage-based billing — an exposed key could result in unexpected charges from unauthorized use. Lovable's Cloud Secrets ensure the key stays server-side and is never included in the React bundle.

Create the Edge Function that proxies Realtor.com API requests. The function adds the RapidAPI authentication headers and forwards search requests from your Lovable frontend to Realtor.com's endpoints. Realtor.com's property search endpoint accepts query parameters for location (city and state, or zip code), price range (list_price_min, list_price_max), bedrooms (beds_min, beds_max), bathrooms (baths_min), square footage (sqft_min, sqft_max), property type (type: single_family, condo, townhomes, multi_family, land, mobile), and status (for_sale, for_rent, sold). The response includes a properties array with: property_id, permalink (Realtor.com URL), primary_photo (thumbnail URL), location (full address details), description (beds, baths, sqft, type), list_price, status, and open_houses if any. Some fields are nested objects — tell Lovable the structure explicitly so it generates correct field access code in the React components. For address autocomplete (useful for the search bar), Realtor.com has a /locations/search endpoint that returns city, state, zip, and neighborhood suggestions. Add this as a second operation in the Edge Function to support autocomplete in the property search UI.

1// supabase/functions/realtor-proxy/index.ts
2import { serve } from "https://deno.land/std@0.168.0/http/server.ts";
3
4const corsHeaders = {
5  "Access-Control-Allow-Origin": "*",
6  "Access-Control-Allow-Headers": "authorization, x-client-info, apikey, content-type",
7  "Access-Control-Allow-Methods": "POST, OPTIONS",
8};
9
10serve(async (req: Request) => {
11  if (req.method === "OPTIONS") {
12    return new Response("ok", { headers: corsHeaders });
13  }
14
15  try {
16    const apiKey = Deno.env.get("RAPIDAPI_KEY");
17    const apiHost = Deno.env.get("REALTOR_API_HOST");
18
19    const { operation, ...params } = await req.json();
20    const headers = {
21      "X-RapidAPI-Key": apiKey || "",
22      "X-RapidAPI-Host": apiHost || "",
23      "Accept": "application/json",
24    };
25
26    let url = `https://${apiHost}`;
27    let queryParams: Record<string, string> = {};
28
29    if (operation === "search") {
30      url += "/properties/search-with-filters";
31      if (params.city) queryParams.city = params.city;
32      if (params.state) queryParams.state_code = params.state;
33      if (params.zipCode) queryParams.postal_code = params.zipCode;
34      if (params.priceMin) queryParams.list_price_min = String(params.priceMin);
35      if (params.priceMax) queryParams.list_price_max = String(params.priceMax);
36      if (params.bedsMin) queryParams.beds_min = String(params.bedsMin);
37      if (params.propertyType) queryParams.type = params.propertyType;
38      if (params.status) queryParams.status = params.status;
39      queryParams.limit = String(params.limit || 20);
40      queryParams.offset = String(((params.page || 1) - 1) * (params.limit || 20));
41    } else if (operation === "getProperty") {
42      url += `/properties/${params.propertyId}`;
43    } else if (operation === "autocomplete") {
44      url += "/locations/search";
45      queryParams.query = params.query;
46    }
47
48    const fullUrl = Object.keys(queryParams).length
49      ? `${url}?${new URLSearchParams(queryParams)}`
50      : url;
51
52    const response = await fetch(fullUrl, { headers });
53    const data = await response.json();
54    return new Response(JSON.stringify(data), {
55      status: response.status,
56      headers: { ...corsHeaders, "Content-Type": "application/json" },
57    });
58  } catch (error) {
59    return new Response(JSON.stringify({ error: error.message }), {
60      status: 500, headers: { ...corsHeaders, "Content-Type": "application/json" },
61    });
62  }
63});

With the Edge Function working, open the Lovable chat and describe the property search interface. Provide the Realtor.com response field structure so Lovable generates correct data access code. Realtor.com's property objects have this general structure: { property_id, permalink (URL to Realtor.com listing), primary_photo: { href: photoUrl }, location: { address: { line, city, state_code, postal_code }, county }, description: { beds, baths_consolidated, sqft, type, year_built }, list_price, status }. The primary_photo.href is the thumbnail URL for the listing photo. For a residential property search UI, the standard components are: a location search bar with autocomplete (using the autocomplete operation), price range and bedroom filters, a results grid with property cards, and a side map showing properties as pins (which you can add with Mapbox or Google Maps, but describe this separately to avoid overcomplicating the initial build). Pagination uses an offset parameter — track the current page in React state and calculate the offset (page - 1) * pageSize. Realtor.com returns a total count in the response so you can display 'Showing 1-20 of 543 homes'.

After property search is working, extend the integration to show home values and market trends. These features add depth to the app and are particularly useful for mortgage tools, financial planning apps, or real estate investor dashboards. The Realtor.com API includes property value estimates and neighborhood statistics. When a user looks up a specific address, the response can include an estimate value, estimate range (low/high), and historical price data. For market trends, some endpoint tiers provide median list price, median days on market, and number of active listings by zip code or neighborhood. For a home value estimator flow: add an address search input that uses the autocomplete operation, then fetches the property by ID to get the estimate and last sold price. Display the current estimate prominently with a 'vs. last sold' comparison. A trend chart showing price over time adds significant value for users assessing whether to buy or sell. These data features add real value to your app and often differentiate it from a basic listing search. For complex real estate applications combining multiple data sources, Realtor.com valuations with CoStar market analytics, and custom investment calculators, RapidDev's team can help architect the full data layer.