Applications & Technology

Developer Portal

Powerful data at your fingertips

The Developer Portal allows customers, technology solution providers (TSPs), and industry professionals to access Fannie Mae mortgage and housing data through application programming interfaces (APIs):  

Business Partner APIs

Access mortgage data and insights across the entire loan life cycle to move your business forward. View our catalog of Business Partner APIs

Public APIs

Leverage free housing and economic data to create solutions, strategies, and apps that drive business decisions and help expand access to affordable housing. The Developer Portal has everything you – and your development staff – need to access and use our APIs.

Developer Portal Availability

Every day, 24 hours a day, except from 1 a.m. to 5 a.m. ET the first and third Sundays each month due to maintenance. 

All Technology Application Availability

Looking to streamline your process?

Lenders say APIs have the greatest potential to streamline processes.

Learn More


  • Access to a full suite of APIs across the mortgage life cycle in one place
  • Getting Started section that provides step-by-step onboarding instructions for lenders and TSPs
  • Sample use cases that highlight practical, everyday applications for many of the APIs
  • Powerful data visualization tools that offer quick analysis and insights into housing data

API Benefits  

  • Deploy integrations faster and save time using common industry standards and documentation
  • Reduce costs and increase productivity through workflow automation
  • Improve efficiencies using end-to-end connections that communicate data in real time across multiple channels
  • Enhance both customer and partner experiences through data-driven innovations
  • Easily analyze housing data without deep technical expertise, including number crunching previously done by specialists