7 Real Estate APIs: What Housing Crisis?

John Musser, April 16th, 2008

Despite the headlines about the ongoing housing crisis, there’s no shortage of new real estate-related APIs coming to market. We now have 7 real estate APIs in our directory, covering a range of services from real estate search, pricing, mortgage quotation services, and agent ratings. Here’s an overview of the APIs in this space:

  • Zillow: Perhaps the most well known real estate API, it exposes their popular services like “zestimates”, a form of algorithmic home estimates. It’s been used in a variety of mashups, 15 at last count. One of the early challenges Zillow had was an claim filed with the FTC about potentially misleading consumers with their valuations (a claim that ultimately wasn’t substantiated).
  • Rentometer: A real estate pricing service for rentals where “you can request information such as low, median, and high rental rates and comparable market data for a specific property or area.”
  • Trulia: This useful real estate search engine offers an API that’s been used to create at least 7 interesting mashups. The Trulia service itself offers lots of interesting real estate-related data and metrics.
  • Mortgage Marvel: A mortgage rates quote service that “enables your users to get the same mortgage rate comparisons available on Mortgage Marvel right on your site. Our API allows you to collect rate search parameters and present real-time, mortgage rate and fee quotes from multiple lenders.”
  • Nestoria: Nestoria is a vertical search engine for property in the UK and Spain. The site offers an API to their database of geocoded properties. Earlier we did a mashup case study with Nestoria founder Ed Freyfogle.
  • AgentRank API: Access to real estate agent sales, forecasts, and reviews from AgentRank.com system for ranking Realtors based on professional experience, recent home sales, endorsements from past clients, and other variables.” The API supports both SOAP and REST, although data in the database seems a little sparse at the moment.
  • Planning Alerts: A local UK service that “searches as many local authority planning websites as it can find and emails you details of applications near you. The aim of this to enable shared scrutiny of what is being built (and knocked down) in peoples communities.”

Certainly real estate mashups have been popular, there are 167 now, and last year we profiled the best of 78.

One of our most visited mashup profiles in this market is for PlotOrNot that uses the Trulia API to give you graphical answers to lots of interesting questions based on real estate pricing data.

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16 Responses to “7 Real Estate APIs: What Housing Crisis?”

April 16th, 2008
at 12:16 pm
Comment by: Rob

Hi John – thanks for including us. Probably the most interesting Trulia data for developers are our historical home price trends nationwide. Your link above highlights some cool Trulia powered apps – if anyone builds another, definitely drop me a line about it at rcross at trulia dot com.

April 16th, 2008
at 1:19 pm
Comment by: Mike


I work for Nestoria. Just wanted to note that our API can also supply monthly and quarterly data about average asking prices (for sales and rental) since October of 2007.

Thanks for including us in your roundup,


April 16th, 2008
at 4:14 pm
Comment by: Drew Meyers from Zillow

Thank you for featuring the Zillow API along with these other real estate APIs. I wanted to post a few updated numbers regarding users of our API — currently, over 4,200 sites have API “keys”, with roughly 250 live implementations.

Another thing to note is that other sites can now access local real estate information such as affordability statistics and demographic information at the city and neighborhood level using our GetDemographics call.

We have a couple of exciting additions to the Zillow API coming later this year. I think it’s safe to say there will be some further innovation relating to mashing up real estate API’s in 2008.

April 17th, 2008
at 12:22 am
Comment by: John Musser

@Rob, Mike and Drew: Thanks for the additional details on your APIs. It’s great to see the advances you guys are making in turning the real estate market into a programmable platform.

April 18th, 2008
at 6:58 am
Comment by: Yannick from Properazzi

Properazzi have a terrific API that we’ve used to facilitate projects with various partners in the past year.

But we’re hoping to make the Properazzi API openly available to all developers later this year.

Great list, John. It’s great to see companies really pushing the technology envelope in our industry.

April 22nd, 2008
at 6:29 pm
Comment by: Fairfax Housing Prices - Late April 2008 - Stock Market Analysis at DeepMarket

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August 8th, 2008
at 4:05 pm
Comment by: Mortgage Rates from Mortgage Marvel

Thanks for including our Mortgage Rate API in the list. We look forwarding to seeing how innovative programmers integrate our data into their websites.

September 21st, 2008
at 3:12 am
Comment by: Nishu

See it is great way to do real state business throw API . IF a simple person like me wants to make real estate website throw API then he will solve a lots problem of DATA push of real estate etc…

API benefits to both companies who have data and who don’t have data for example http://www.kayak.com/ which will search more then 140 site throw API which give perfect price to client …similar thing in Real Eestat throw API of Real Estate the client get perfect price and the website owner get more hits and the API of Real estate provider get more sales which slove a lots problem of ALL the web …i appreciate the program who devlope this type of things and appreciate those companies like Mortage or etc …

Thanks a lot .

Nishu Jambudi
API implementor & Devloper

May 12th, 2009
at 1:54 pm
Comment by: See the Price of That House You’re Driving by with Zillow on iPhone « Openr Blog

[...] estate APIs are a popular category with developers. Last year we profiled this category in 7 Real Estate APIs: What Housing Crisis?. Since then more have been released, with 11 real estate APIs now available including the New York [...]

June 3rd, 2009
at 6:23 am
Comment by: Top Twenty Open APIs and Mashup Resources for Web Developers « Compassion in Politics: Christian Social Entrepreneurship, Social Innovation, & Base of the Pyramid/BOP Solutions

[...] web developers are using these apis. The Zillow api is probably the most popular of these. –real estate APIs –78 real estate mashups Part II: More Open APIs and Mashup Resources 1) Flickr API and you [...]

November 2nd, 2009
at 2:23 am
Comment by: A Sign Of The Times: The First Foreclosure API

[...] niche of APIs and topic we looked at last year back when there were 7 real estate APIs in our post: What Housing Crisis?. Related ProgrammableWeb Resources ForeclosureListings.com [...]

April 4th, 2010
at 3:20 am
Comment by: Real Estate Flyer

Great list. But I prefer zillow much.

December 13th, 2010
at 11:31 pm
Comment by: Sunshine Coast real estate

Thanks for including our Mortgage Rate API in the list. We look forwarding to seeing how innovative programmers integrate our data into their websites.

May 4th, 2011
at 4:31 am
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John Musser
Founder, ProgrammableWeb

Adam DuVander
Executive Editor, ProgrammableWeb. Author, Map Scripting 101. Lover, APIs.