Live & free — no keys: US Census geocoder · FEMA National Flood Hazard Layer · HUD FY2026 Fair Market Rents · county & state assessor layers · Photon address suggestions.
Paid providers (rent AVM, permits, skip trace, vision) run on fixtures until their env keys are set — the interface labels which is which, every time.
Every figure carries its source. “Not available” is a value, never an interpolation.