> ## Documentation Index
> Fetch the complete documentation index at: https://docs.propx402.xyz/llms.txt
> Use this file to discover all available pages before exploring further.

# Data Sources

> All 14 public and government APIs powering PropX402

PropX402 queries **14 public and government APIs** in parallel. No private brokers — all sources are official databases, open registries, or free-tier APIs.

<CardGroup cols={2}>
  <Card title="OpenStreetMap" icon="map-pin">
    Geocoding — converts address to lat/lon + normalized string. Zero cost, global coverage.
  </Card>

  <Card title="RentCast" icon="house">
    140M+ properties — AVM, rent estimates, property details, comparables. Free-tier API key.
  </Card>

  <Card title="FEMA Flood Map" icon="water">
    NFHL flood zone classification at property coordinates. Fully free, no key.
  </Card>

  <Card title="OSM Overpass" icon="person-walking">
    Real amenity-based walkability — POI count within 800m radius. Fully free.
  </Card>

  <Card title="US Census ACS" icon="users">
    5-year survey — income, home values, vacancy, demographics. Fully free.
  </Card>

  <Card title="EPA EJSCREEN" icon="leaf">
    Environmental justice — air quality percentile, superfund proximity. Fully free.
  </Card>

  <Card title="USGS NEHRP 2020" icon="mountain">
    Earthquake hazard — peak ground acceleration at address coordinates. Fully free.
  </Card>

  <Card title="NOAA Severe Weather" icon="cloud-bolt">
    Tornado and hail risk by state — feeds insurance estimates. Fully free.
  </Card>

  <Card title="FCC Broadband Map" icon="wifi">
    Internet availability — gigabit access, fiber, max speeds, provider count. Fully free.
  </Card>

  <Card title="HUD Opportunity Zones" icon="star">
    Federal OZ designation — capital gains tax advantage flag. Fully free.
  </Card>

  <Card title="HUD Fair Market Rent" icon="dollar-sign">
    County FMR benchmarks — studio through 4BR. Fully free.
  </Card>

  <Card title="FRED (St. Louis Fed)" icon="chart-line">
    State housing price index — YoY appreciation trend. Free API key.
  </Card>

  <Card title="BLS" icon="briefcase">
    State unemployment rate and trend — rental demand signal. Fully free.
  </Card>

  <Card title="OpenFEMA" icon="triangle-exclamation">
    Federal disaster history by county — floods, storms, declarations. Fully free.
  </Card>
</CardGroup>

<Info>
  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.
</Info>