FHFA house price index trend for a state. Perfect for: 'house price index for a state', 'home price appreciation in a state', 'HPI year-over-year for an area', 'state home price trend', 'how much have home prices risen in a state'. Returns the FRED-hosted FHFA all-transactions HPI for the state of a US point: latest index, year-over-year percent change, and units. State-level. Historical index, not a forecast. Key-gated (FRED); charge-free when unkeyed, on failure, or no data.