OpenStreetMap
Geocoding — converts address to lat/lon + normalized string. Zero cost, global coverage.
RentCast
140M+ properties — AVM, rent estimates, property details, comparables. Free-tier API key.
FEMA Flood Map
NFHL flood zone classification at property coordinates. Fully free, no key.
OSM Overpass
Real amenity-based walkability — POI count within 800m radius. Fully free.
US Census ACS
5-year survey — income, home values, vacancy, demographics. Fully free.
EPA EJSCREEN
Environmental justice — air quality percentile, superfund proximity. Fully free.
USGS NEHRP 2020
Earthquake hazard — peak ground acceleration at address coordinates. Fully free.
NOAA Severe Weather
Tornado and hail risk by state — feeds insurance estimates. Fully free.
FCC Broadband Map
Internet availability — gigabit access, fiber, max speeds, provider count. Fully free.
HUD Opportunity Zones
Federal OZ designation — capital gains tax advantage flag. Fully free.
HUD Fair Market Rent
County FMR benchmarks — studio through 4BR. Fully free.
FRED (St. Louis Fed)
State housing price index — YoY appreciation trend. Free API key.
BLS
State unemployment rate and trend — rental demand signal. Fully free.
OpenFEMA
Federal disaster history by county — floods, storms, declarations. Fully free.
All sources are queried in parallel. If an individual source fails, that field returns a
note key instead of data. Only a geocoding failure (OpenStreetMap) returns a 500 error.