---
title: "State house price index (FHFA via FRED)"
method: POST
path: "/api/locus_house_price_index"
tags: ["investors", "house-price-index", "trend", "read-only", "free", "free"]
---

# State house price index (FHFA via FRED)

`POST /api/locus_house_price_index`

## Request

- Base URL: `https://api.locus.report`
- URL: `https://api.locus.report/api/locus_house_price_index`
- Auth: none required

Latest state FHFA All-Transactions House Price Index and its year-over-year change for an address, for agents, from FHFA via FRED. Use before a state index check. Index data only; never an appraisal, dollar value, or hot/cold market verdict. Needs a FRED API key and fails closed when unset. Carries FRED attribution. National.
Use this when you can call Locus free tools (REST tools/call or MCP).
Use locus-house-price-index instead when your client can only call paid x402 routes; it returns the same records. Direct flat-body route for this one free resource; no API key, payment, or catalog wrapper. Return only the cited bounded evidence described here; this route never produces a paid brief or full report.

## Request body

- object
  - `address` string: Optional US street address or place; NC uses AddressNC first, other areas use the national geocoder fallback when latitude/longitude are not provided.
  - `latitude` number: Optional decimal latitude; provide with longitude to skip address geocoding.
  - `longitude` number: Optional decimal longitude; provide with latitude to skip address geocoding.

## Response `200`

Free cited evidence response.

- object

## Other responses

- `400`: Invalid request body.
- `429`: Rate limited.

---

[API](https://skmtc.dev/locus/apis/locus-api.md) · [All operations](https://skmtc.dev/locus/apis/locus-api/llms.txt) · [OpenAPI document](https://skmtc.dev/locus/apis/locus-api/revisions/ba7786b74adb?raw)