# RentCast AVM Value Estimate

> RentCast AVM Value Estimate is a paid API for AI agents from rentcast.x402.paysponge.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-09-15).

Returns an automated valuation model (AVM) estimate of a property's current market value using RentCast data via Sponge x402 payment proxy

## Facts

- Endpoint: GET https://rentcast.x402.paysponge.com/avm/value
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-15
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/sponge-6ec21eba
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_t-hmdDw4KLRNxLU9Juypl

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 sponge-6ec21eba
```

Example prompt: What's the current estimated market value of 123 Main Street, Austin, TX 78701? I need an AVM property value estimate.

## When to prefer this

Use this endpoint when you need a quick automated valuation estimate for a US residential property and want to pay per-call with no subscription via the x402 micropayment protocol. Prefer this over manual appraisal lookups when building real estate analysis workflows, comparing property values, or enriching property records with current market estimates.

## Known failure modes

- Property not found in RentCast database — returns error or empty result
- Invalid or unrecognized address format — validation error
- Payment failure via x402 — 402 Payment Required if funds insufficient
- Rate limiting or quota exceeded on the proxy gateway
- Property in unsupported region or market — limited data availability

## How this service works

Value Estimate

## Output

Returns a JSON object containing the estimated current market value of the property, likely including a value estimate, high/low confidence range, and supporting comparable data from RentCast's AVM model.

## Example request

```json
{
 "address": "5500 Grand Lake Dr, San Antonio, TX, 78244",
 "daysOld": 90,
 "bedrooms": 3,
 "bathrooms": 2,
 "compCount": 10,
 "propertyType": "Single Family",
 "squareFootage": 1500
}
```

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "address": {
   "type": "string",
   "default": "5500 Grand Lake Dr, San Antonio, TX, 78244",
   "description": "The **full address** of the property, in the format `Street, City, State, Zip`. You need to provide either the `address` or the `latitude`/`longitude` parameters"
  },
  "daysOld": {
   "type": "integer",
   "format": "int32",
   "description": "The maximum number of days since comparable listings were last seen on the market, with a minimum of 1"
  },
  "bedrooms": {
   "type": "number",
   "format": "float",
   "default": "",
   "description": "The number of bedrooms in the property. Use `0` to indicate a studio layout"
  },
  "latitude": {
   "type": "number",
   "format": "float",
   "description": "The latitude of the property. The `latitude`/`longitude` can be provided instead of the `address` parameter"
  },
  "bathrooms": {
   "type": "number",
   "format": "float",
   "default": "",
   "description": "The number of bathrooms in the property. Supports fractions to indicate partial bathrooms"
  },
  "compCount": {
   "type": "integer",
   "format": "int32",
   "default": 5,
   "description": "The number of comparable listings to use when calculating the value estimate, between 5 and 25. Defaults to `15` if not provided"
  },
  "longitude": {
   "type": "number",
   "format": "float",
   "description": "The longitude of the property. The `latitude`/`longitude` can be provided instead of the `address` parameter"
  },
  "maxRadius": {
   "type": "number",
   "format": "float",
   "description": "The maximum distance between comparable listings and the subject property, in miles"
  },
  "propertyType": {
   "enum": [
    "Single Family",
    "Condo",
    "Townhouse",
    "Manufactured",
    "Multi-Family",
    "Apartment",
    "Land"
   ],
   "type": "string",
   "default": "",
   "description": "The type of the property. See [explanation of property types](https://developers.rentcast.io/reference/property-types)"
  },
  "squareFootage": {
   "type": "number",
   "format": "float",
   "default": "",
   "description": "The total living area size of the property, in square feet"
  },
  "lookupSubjectAttributes": {
   "type": "boolean",
   "default": "",
   "description": "When enabled, will attempt to look up subject property attributes to find more relevant comps. Defaults to `true` if not provided. [Learn more](https://developers.rentcast.io/reference/property-valuation#subject-property-attribute-lookup
… (truncated)
```

## Response schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "price": {
   "type": "integer",
   "default": 0,
   "example": 221000
  },
  "latitude": {
   "type": "number",
   "default": 0,
   "example": 29.475962
  },
  "longitude": {
   "type": "number",
   "default": 0,
   "example": -98.351442
  },
  "comparables": {
   "type": "array",
   "items": {
    "type": "object",
    "properties": {
     "id": {
      "type": "string",
      "example": "5014-Fern-Lk,-San-Antonio,-TX-78244"
     },
     "city": {
      "type": "string",
      "example": "San Antonio"
     },
     "price": {
      "type": "integer",
      "default": 0,
      "example": 229900
     },
     "state": {
      "type": "string",
      "example": "TX"
     },
     "county": {
      "type": "string",
      "example": "Bexar"
     },
     "daysOld": {
      "type": "integer",
      "default": 0,
      "example": 127
     },
     "lotSize": {
      "type": "integer",
      "default": 0,
      "example": 6316
     },
     "zipCode": {
      "type": "string",
      "example": "78244"
     },
     "bedrooms": {
      "type": "integer",
      "default": 0,
      "example": 4
     },
     "distance": {
      "type": "number",
      "default": 0,
      "example": 0.2994
     },
     "latitude": {
      "type": "number",
      "default": 0,
      "example": 29.471777
     },
     "bathrooms": {
      "type": "integer",
      "default": 0,
      "example": 2
     },
     "longitude": {
      "type": "number",
      "default": 0,
      "example": -98.350172
     },
     "yearBuilt": {
      "type": "integer",
      "default": 0,
      "example": 1986
     },
     "listedDate": {
      "type": "string",
      "example": "2024-04-03T00:00:00.000Z"
     },
     "correlation": {
      "type": "number",
      "default": 0,
      "example": 0.9822
     },
     "listingType": {
      "type": "string",
      "example": "Standard"
     },
     "removedDate": {
      "type": "string",
      "example": "2024-05-26T00:00:00.000Z"
     },
     "addressLine1": {
      "type": "string",
      "example": "5014 Fern Lk"
     },
     "addressLine2": {},
     "daysOnMarket": {
      "type": "integer",
      "default": 0,
      "example": 53
     },
     "lastSeenDate": {
      "type": "string",
      "example": "2024-05-25T13:11:55.018Z"
     },
     "propertyType": {
      "type": "string",
      "example": "Single Family"
     },
     "squareFootage": {
      "type": "integer",
      "default": 0,
      "example": 1747
     },
     "
… (truncated)
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/sponge-6ec21eba/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from rentcast.x402.paysponge.com](https://www.zero.xyz/host/rentcast.x402.paysponge.com/llms.txt)