# FHFA House Price Index Lookup

> FHFA House Price Index Lookup is a paid API for AI agents from api.agentstools.dev, paid per call via x402, $0.015/call, status unknown (last checked 2026-09-15).

Returns the FHFA House Price Index for a US geography including current level, YoY/QoQ/5-year growth rates, momentum flags, and recent history

## Facts

- Endpoint: GET https://api.agentstools.dev/realestate/prices
- Price: $0.015/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/fhfa-house-price-index-lookup-33f04f0b
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_vQCk0JWC-1NlGC56Gi3FO

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability fhfa-house-price-index-lookup-33f04f0b
```

Example prompt: What does the FHFA House Price Index show for the Austin metro area right now — give me the year-over-year and 5-year growth plus the last 8 quarters of history so I can see the trend.

## When to prefer this

Use this endpoint when you need official US government-backed house price index data (FHFA HPI) for states or metro CBSAs, including growth rates and trend history. Prefer this over proprietary alternatives when public domain, reproducible data is required. Note that county and ZIP resolution falls back to state-level data.

## Known failure modes

- Invalid or unrecognized geography string returns an error or empty result
- County FIPS or ZIP codes silently resolve to state-level index rather than granular data
- Non-US geographies are not supported
- Range values outside 1–40 are rejected by schema validation
- Ambiguous 5-digit input without type hint may be misinterpreted (ZIP vs CBSA)

## How this service works

The FHFA House Price Index for a geography: the current index level plus year over year, quarter over quarter and five year growth, with momentum flags and a short history. State and metro CBSA levels are covered directly; county and ZIP resolve to the state level index. Public domain, US only.

## Output

Returns the current FHFA HPI level for the requested geography along with year-over-year, quarter-over-quarter, and 5-year growth percentages, momentum flag indicators, and a short historical series of index observations. County and ZIP inputs resolve to state-level index data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET",
      "HEAD",
      "DELETE"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "geo"
     ],
     "properties": {
      "geo": {
       "type": "string",
       "description": "A state, metro CBSA code, county FIPS, ZIP, or address"
      },
      "type": {
       "enum": [
        "auto",
        "state",
        "county",
        "cbsa",
        "zip",
        "address"
       ],
       "type": "string",
       "description": "How to read geo (auto reads a 5-digit number as a ZIP)"
      },
      "range": {
       "type": "integer",
       "maximum": 40,
       "minimum": 1,
       "description": "Most recent N index observations of history"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string"
    },
    "example": {
     "type": "object"
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/fhfa-house-price-index-lookup-33f04f0b/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.agentstools.dev](https://www.zero.xyz/host/api.agentstools.dev/llms.txt)