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Learn how to access market-level housing data across the US. This guide will help you retrieve your API key, search markets, and start analyzing housing trends using the API.

Looking for property-level data instead? Check out our Property API Quickstart.

Experienced developer? Jump straight to our API Reference.


Get Up and Running

In this guide, you'll learn how to:

  1. Create your Parcl Labs account and get an API key
  2. Make your first API call
  3. Search markets and understand parcl_ids
  4. Track your API usage
  5. Start building with real examples

1. Set Up Your API account

Create your Parcl Labs account to get started:

  1. Register for a free account at here (or sign in if you have one)

  2. Navigate to the dashboard and copy your API key

  1. Store your key securely - you'll need it for all API requests

2. Make Your First Request

Let's make your first API call! We'll retrieve the latest housing market activity for Chicago, including sales, new listings, and rental activity. You can copy and paste this cURL command (a widely used command-line tool for making API requests) into your terminal:

curl -X GET "https://api.parcllabs.com/v1/market_metrics/2899845/housing_event_counts?limit=1&offset=0" \
  -H "Accept: application/json" \
  -H "Authorization: {API_KEY}"

📘

Before running the command:

  • Replace {API_KEY} with your actual API key

What happens when you run this command:

  1. The API validates your API key.
  2. Looks up the latest housing activity for parcl_id 2899845 (Chicago).
  3. Returns one month of data (limit=1) starting from the most recent month (offset=0) for all property types in the selected market.
  4. Displays the results in your terminal.

You'll get back a response like this:

{
  "parcl_id": 2899845,
  "property_type": "ALL_PROPERTIES",
  "items": [
    {
      "date": "2024-11-01",
      "sales": 13236,
      "new_listings_for_sale": 8478,
      "new_rental_listings": 17481,
      "transfers": 21544
    }
  ],
  "total": 71,
  "limit": 1,
  "offset": 0,
  "links": {
    "first": "https://api.parcllabs.com/v1/market_metrics/2899845/housing_event_counts?limit=1&offset=0",
    "last": "https://api.parcllabs.com/v1/market_metrics/2899845/housing_event_counts?limit=1&offset=70",
    "self": "https://api.parcllabs.com/v1/market_metrics/2899845/housing_event_counts?limit=1",
    "next": "https://api.parcllabs.com/v1/market_metrics/2899845/housing_event_counts?limit=1&offset=1",
    "prev": null
  }
}

Understanding the response:

  • sales: Completed home sales in the market
  • new_listings_for_sale: New properties that came on the market
  • new_rental_listings: New rental properties available
  • transfers: Total ownership transfers (includes non-sale transfers)
  • links: Navigation links for retrieving additional months of data
  • total: Total number of datapoints available

3. Search a Market

Following your first request, the next step is to explore the markets available through the Parcl Labs API. The API covers every market in the US at any geographic level, including zip code, city, town, county, and Metropolitan Statistical Area (MSA) levels.

The Search Markets endpoint allows you to retrieve the parcl_id - the unique identifier for each market. This parcl_id is your gateway to the API - you'll need it as a required parameter in most other endpoints to access data about your selected market.

Calls to the search endpoint do not count against your credit limit. We want you to easily find the markets you need to kickstart your analysis without impacting your available credits.

Below, we explore two primary methods for using the search endpoint: by entering a specific text-based query, such as "New York City," or by applying geographic parameters to retrieve all parcl_ids that meet specific location criteria, like all cities within California.

A. Search Using a Query Term

The search query is the most straightforward method to discover markets using the Parcl Labs API. Here’s how you can craft and execute a search query effectively:

  1. Craft your query: Input a specific name or term associated with the geographic area you are interested in. This could be a city name (or equivalent), a county, or even a zip code.
  2. Executing the query-based search: Use the following cURL command to perform the search:
curl -X GET "https://api.parcllabs.com/v1/search/markets?query={QUERY}" \
  -H "Accept: application/json" \
  -H "Authorization: {API_KEY}"

📘

Before running the command:

  • Replace {API_KEY} with your actual API key
  • Replace {QUERY} with your market of interest, ensuring that spaces in the query are URL-encoded (e.g., "New York City" becomes "New%20York%20City")

This command will return results for the query term (e.g., "New York City"), fetching the parcl_id(s) associated with this term.

You'll get back a response like this:

{
  "items": [
    {
      "parcl_id": 2900187,
      "country": "USA",
      "geoid": "35620",
      "state_fips_code": null,
      "name": "New York-Newark-Jersey City, Ny-Nj-Pa",
      "state_abbreviation": null,
      "region": null,
      "location_type": "CBSA",
      "total_population": 19908595,
      "median_income": 93610,
      "parcl_exchange_market": 0,
      "pricefeed_market": 1,
      "case_shiller_10_market": 1,
      "case_shiller_20_market": 1
    },
    {
      "parcl_id": 5372594,
      "country": "USA",
      "geoid": "3651000",
      "state_fips_code": "36",
      "name": "New York City",
      "state_abbreviation": "NY",
      "region": "MIDDLE_ATLANTIC",
      "location_type": "CITY",
      "total_population": 8622467,
      "median_income": 76607,
      "parcl_exchange_market": 1,
      "pricefeed_market": 1,
      "case_shiller_10_market": 0,
      "case_shiller_20_market": 0
    },
    {
      "parcl_id": 5822484,
      "country": "USA",
      "geoid": "36061",
      "state_fips_code": "36",
      "name": "New York County",
      "state_abbreviation": "NY",
      "region": "MIDDLE_ATLANTIC",
      "location_type": "COUNTY",
      "total_population": 1645867,
      "median_income": 99880,
      "parcl_exchange_market": 0,
      "pricefeed_market": 1,
      "case_shiller_10_market": 0,
      "case_shiller_20_market": 0
    },
    {
      "parcl_id": 5307989,
      "country": "USA",
      "geoid": "3479610",
      "state_fips_code": "34",
      "name": "West New York Town",
      "state_abbreviation": "NJ",
      "region": "MIDDLE_ATLANTIC",
      "location_type": "TOWN",
      "total_population": 52438,
      "median_income": 70141,
      "parcl_exchange_market": 0,
      "pricefeed_market": 0,
      "case_shiller_10_market": 0,
      "case_shiller_20_market": 0
    },
    {
      "parcl_id": 5372782,
      "country": "USA",
      "geoid": "3651011",
      "state_fips_code": "36",
      "name": "New York Mills Village",
      "state_abbreviation": "NY",
      "region": "MIDDLE_ATLANTIC",
      "location_type": "VILLAGE",
      "total_population": 3084,
      "median_income": 55000,
      "parcl_exchange_market": 0,
      "pricefeed_market": 0,
      "case_shiller_10_market": 0,
      "case_shiller_20_market": 0
    },
    {
      "parcl_id": 5504094,
      "country": "USA",
      "geoid": "2746060",
      "state_fips_code": "27",
      "name": "New York Mills City",
      "state_abbreviation": "MN",
      "region": "WEST_NORTH_CENTRAL",
      "location_type": "CITY",
      "total_population": 1166,
      "median_income": 46458,
      "parcl_exchange_market": 0,
      "pricefeed_market": 0,
      "case_shiller_10_market": 0,
      "case_shiller_20_market": 0
    }
  ],
  "total": 6,
  "limit": 12,
  "offset": 0,
  "links": {
    "first": "https://api.parcllabs.com/v1/search/markets?query=New+York&offset=0",
    "last": "https://api.parcllabs.com/v1/search/markets?query=New+York&offset=0",
    "self": "https://api.parcllabs.com/v1/search/markets?query=New%20York",
    "next": null,
    "prev": null
  }
}

Each search term may return multiple unique markets, and each unique market has its own distinct parcl_id.


B. Search Using Market Parameters

In addition to basic search term queries, the Parcl Labs API allows you to refine your search using specific geographic parameters. These parameters help narrow down the search results to more closely match your needs:

  1. Geographic scope:
    • You can specify the type of geographic boundary for your search, such as CITY, COUNTY, ZIP5, or CBSA. This helps in pinpointing the exact level of data granularity you need.
  2. Regional filtering:
    • The API allows filtering by region or state, facilitating searches that are constrained to specific areas of interest. For example, you can focus your search within a particular state or a broader federal region.
  3. Executing the parameter-based search: Use the following cURL command to perform the search for markets in a specific state (CA) and location type (CITY):
curl -X GET "https://api.parcllabs.com/v1/search/markets?state_abbreviation=CA&location_type=CITY" \
  -H "Accept: application/json" \
  -H "Authorization: {API_KEY}"

📘

Before running the command:

Replace {API_KEY} with your actual API key

This command will return results for all cities within the state of California, fetching all the parcl_ids associated with these cities.

Want to explore more search options? Check out our Search Quickstart Notebook for advanced examples and real-world use cases.


C. Using parcl_id To Retrieve Market Metrics

Once you have the parcl_id for a specific market from your search results, you can use this identifier to request metrics about that market directly from the Parcl Labs API.

How to Use the parcl_id:

  • Insert the parcl_id into the API request path: Use the parcl_id as an API path parameter to access specific data endpoints, such as housing stock, market prices, rental yields, or investor metrics.

Example Command to Retrieve Metrics:

To get information about the housing stock for a particular market, you can use the following command:

curl -X GET "https://api.parcllabs.com/v1/market_metrics/{parcl_id}/housing_stock" \
  -H "Accept: application/json" \
  -H "Authorization: {API_KEY}"

📘

Before running the command:

  • Replace {API_KEY} with your actual API key
  • Replace {parcl_id} with the actual parcl_id obtained from your search

Using the parcl_id, this command retrieves data on the market's housing stock, including counts of single-family homes, condos, and townhouses.

Congrats! You've successfully navigated key functionalities of the API: you've performed market searches to identify parcl_ids and accessed core housing market metrics, such as housing stock and investor purchase-to-sale ratios.


4. Check Your Usage

Keep track of your API usage in real-time by visiting the Parcl Labs dashboard. Credits are simple: 1 data point = 1 credit.

Here's what you'll find in your dashboard:

  • Credits used this cycle
  • Remaining credits
  • When your credits reset

Learn more about credits, how to manage your usage, and explore upgrade options in our Credits Guide.


5. Start Building

Here are your next steps to continue learning about and building with our API:


Need help getting started? Join our developer community or email us at [email protected].

Updated 9 days ago