Data now plays a key role in the real estate industry. From fast home valuations to virtual tours and AI-driven investment tools, almost every new feature in real estate apps depends on large amounts of reliable data. But how does this data move from massive databases to the easy-to-use apps we see on our screens? The answer is in something behind the scenes: the Application Programming Interface, or API.

An API, for those unfamiliar with the term, acts like a secure and standardized messenger. It’s a set of rules that lets different software systems share and exchange information. In real estate, this allows developers to get specific data—such as a property’s history, tax records, or market trends—without needing to build their own database. Instead, they send a request to a trusted source through an API and receive clean, organized data they can use in their apps.

APIs are especially valuable because they help developers focus on making useful features and tools, instead of spending time gathering and updating data. They improve speed, efficiency, and allow even small businesses to work with the same level of data quality as larger companies. Picking the right API is a major step when building any real estate platform because it affects how complete, reliable, and useful the service will be.

Here are ten of the top real estate APIs helping to power the next wave of tools and apps in property technology.

Top 10 Real Estate APIs Supporting Property Tech in 2025

1. ATTOM Data Solutions API
   ATTOM is known for its wide-ranging real estate data, covering more than 155 million properties in the U.S. Its API gives access to deep layers of data, including foreclosure records, past mortgages, sales history, property taxes, and even environmental risks. This makes it ideal for developers creating tools for in-depth research, risk checks, or complex analytics.
2. CoreLogic API
   CoreLogic is a trusted name in real estate data, often used by banks and mortgage companies. Its Trestle™ API provides secure, standard access to Multiple Listing Service (MLS) data. Developers who need clean and reliable property listings will find this API helpful, especially when working in areas where following data rules is critical.
3. Reonomy API
   Reonomy focuses on commercial real estate. Its API uses AI to connect pieces of data that may not be clearly linked, offering rich insights about property owners, past sales, loans, and even tenants. This makes it a strong choice for professionals in commercial real estate, such as brokers or investors.
4. Mashvisor API
   Mashvisor is built with real estate investors in mind. Its API offers property data along with tools to help with investment decisions. It includes estimates for rental income (both for long-term and short-term rentals like Airbnb), cash returns, and expected occupancy rates. Developers building tools for investors will find this API very useful.
5. RentCast API
   Previously called Realty Mole, RentCast specializes in rental data. Its API provides current rental estimates, property details, rent comparisons, and local trends. It’s a strong choice for apps aimed at landlords, property managers, or rental investors who want clear and current rental information.
6. HouseCanary API
   HouseCanary stands out for its smart property valuation tools. Its API provides automatic valuation models (AVMs) and future forecasts trusted by lenders and large investors. These tools look at thousands of data points to offer up-to-date and future value estimates, which are great for loan and investment apps.
7. Local Logic API
   This API focuses on the neighborhood, not just the house. It gives local details like noise levels, nearby parks, services, and school quality. This helps developers create apps that give users a clearer picture of what it’s like to live in a specific area—not just what the house looks like.
8. Walk Score API
   A well-known option, the Walk Score API gives a quick rating on how easy it is to get around an area on foot, by bike, or public transit. It’s a useful way to help users judge how connected or car-dependent a neighborhood is when searching for a new home.
9. LightBox API
   LightBox offers tools that combine property data with location and risk details. Its API includes information like exact property boundaries, zoning rules, flood zones, and environmental risks. It’s a great fit for apps focused on property research, planning, or development.
10. Plaid API
    Plaid isn’t a real estate data provider in the usual sense, but it’s important in today’s tech-driven real estate world. Its API lets apps securely link to users’ bank accounts to check income, verify funds, or handle rent payments. Any app dealing with the financial side of real estate—like mortgage or rent tools—can benefit from using Plaid.

Conclusion
The real estate world is shifting to a digital foundation, and APIs are at the core of that change. They help developers build smart, helpful, and user-friendly tools by giving easy access to important data. For businesses, using the right API can mean better services and more growth. For users, it leads to better tools and clearer choices. As data becomes even more detailed and up-to-date, APIs will continue to shape how we buy, sell, and understand property.