FEMA Flood Zone Lookup

Use this endpoint when you need authoritative FEMA flood zone data (zone codes like AE, VE, X), SFHA status, or base flood elevation for a specific US point — especially for real estate due diligence, flood insurance determination, or mortgage compliance. Prefer this over general hazard APIs when the specific FEMA zone classification or BFE is required rather than a generic flood risk score.

• Address outside the United States — service only covers US locations
• Ambiguous or unresolvable address — geocoding fails and no result is returned
• Coordinates out of valid range (lat outside [-90,90] or lon outside [-180,180])
• Location in an unmapped area — FEMA flood map data not available for that point
• Missing required query parameter — neither address nor lat+lon pair provided
• Payment failure or insufficient balance — x402 payment required before data is returned