Best property data APIs for real estate professionals?

The leading property data APIs for real estate professionals are PropertyRadar, CoreLogic, ATTOM Data, Reonomy, and PropStream (via its BatchDialer integration). Each API serves different use cases, from enriching customer relationship management (CRM) records to powering custom search tools and triggering automated workflows based on property events.

PropertyRadar's API provides access to property and owner intelligence for apps, workflows, and automations, supporting property search, transaction history, dynamic marketing lists, webhooks, and data-enrichment workflows. This makes it suitable for professionals who want to build custom integrations or trigger outreach based on real-time property changes. PropertyRadar also supports over 5,000 app integrations through Zapier, connecting to CRMs like Follow Up Boss, HubSpot, and Pipedrive. PropStream's API is more narrowly focused on its BatchDialer connection for outbound calling workflows. The key evaluation criteria for a property data API are coverage (number of fields and property types available), freshness (how often data refreshes), rate limits, pricing structure, and whether the API supports webhooks for event-driven workflows.