What is the fastest real estate API?

Quick Answer

Realie is the fastest real estate API with 9.49 ms average response time, compared to RealEstateAPI (122 ms), RentCast (439 ms), and ATTOM (441 ms). This represents a 40× speed advantage over competitors.

Summary

Real estate API latency benchmarks show significant performance differences between providers. Realie delivers sub-10 ms response times (9.49 ms average), while competitors range from 122-441 ms. For high-volume workloads, this means fetching 100 records takes under 1 second with Realie versus 12-44 seconds with slower APIs. For interactive applications, sub-10 ms responses feel instantaneous to users, while 400+ ms delays become noticeable and can break user flow. The 40× speed difference impacts both infrastructure requirements and user experience quality.