Property Data APIs: What Investors Need to Know

The data infrastructure powering modern real estate investing. A guide to the major providers and what they offer.

Property data APIs are the backbone of modern real estate technology. They provide programmatic access to property records, transaction history, ownership information, and market data that would otherwise require hours of manual research at county offices and MLS terminals.

The major providers serve different niches:

CoreLogic offers the most comprehensive property database in the US, covering over 99% of residential properties. Their data includes property characteristics, transaction history, mortgage information, and automated valuations.

ATTOM Data Solutions specializes in investor-relevant data: foreclosure filings, tax liens, owner demographics, and neighborhood analytics. Their bulk data feeds power many of the tools investors use daily.

First American provides title and ownership data, including chain of title, lien information, and document images. Essential for due diligence workflows.

Black Knight (now ICE Mortgage Technology) offers MLS data, mortgage performance data, and property analytics. Their data is widely used in mortgage and lending applications.

For investors building their own analysis tools or integrating data into their workflows, choosing the right API depends on your use case. Deal screening requires broad coverage and fast lookups. Due diligence requires depth — liens, title, environmental. Portfolio monitoring requires time-series data and market trends.

Platforms like Vortonic aggregate data from multiple providers to create a unified view, eliminating the complexity of managing multiple API integrations.