Real estate data via the RentCast API — rent estimates, property values, market statistics, and active rental listings. Requires a free or paid RentCast API key.

RentCast

Real-estate data via the RentCast API: rent estimates, property value estimates, market statistics, and active rental listings.

Tool ID

rentcast

Credential Required

Yes — type rentcast, one property:

Property	Secret	Description
`apiKey`	yes	Your RentCast API key. Get one at app.rentcast.io/app/api. Free tier = 50 calls/month.

Modes

The mode input selects which RentCast endpoint to call:

Mode	Endpoint	Use case
`rent-estimate`	`GET /v1/avm/rent/long-term`	"What would this house rent for?"
`value-estimate`	`GET /v1/avm/value`	"What's this house worth?"
`market`	`GET /v1/markets`	"What's the market like in zip 78244?"
`rental-listings`	`GET /v1/listings/rental/long-term`	"What rentals are currently available in this area?"

Input Properties

Not every mode uses every field. The tool picks out the relevant ones per mode.

Property	Used by	Description
`mode`	all	`rent-estimate` / `value-estimate` / `market` / `rental-listings`
`address`	rent/value/listings	Full address `"Street, City, State, Zip"`
`latitude`	rent/value/listings	Alternative to address
`longitude`	rent/value/listings	Alternative to address
`zipCode`	market (required), listings	5-digit zip
`city`, `state`	listings	Area search
`propertyType`	rent/value/listings	Single Family, Condo, Townhouse, Manufactured, Multi-Family, Apartment, Land
`bedrooms`	rent/value/listings	Number (0 for studio)
`bathrooms`	rent/value/listings	Supports fractions (1.5, 2.5)
`squareFootage`	rent/value	Living area
`radius`	listings	Miles (max 100)
`limit`	listings	1-500 (default 50)
`dataType`	market	`All` / `Sale` / `Rental` (default `All`)
`historyRange`	market	Months of history (default 6)

For rent-estimate and value-estimate you must supply either address or both latitude and longitude.

Published Outputs

Output	Description
`summary`	Human-readable text summary of the call's key numbers
`mode`	Echo of the mode that was called
`status`	HTTP status code
`response`	Full raw JSON response from RentCast as a string
`rent` / `rentRangeLow` / `rentRangeHigh`	only on `rent-estimate` success
`price` / `priceRangeLow` / `priceRangeHigh`	only on `value-estimate` success
`medianSalePrice` / `medianRent`	only on `market` success
`listingCount`	only on `rental-listings` success

Downstream tasks can pull {{call.rent}} or parse {{call.response}} as JSON for details.

Example 1 — Rent estimate

tool: rentcast
credential: my-rentcast
properties:
  mode: rent-estimate
  address: "1600 Amphitheatre Parkway, Mountain View, CA, 94043"
  bedrooms: "3"
  bathrooms: "2"
  squareFootage: "1800"

Typical summary:

RentCast rent estimate:
  estimate: $4,200/mo
  range:    $3,800 – $4,600/mo
  based on 15 comparable listings

Example 2 — Value estimate via lat/lon

tool: rentcast
credential: my-rentcast
properties:
  mode: value-estimate
  latitude: "37.4220"
  longitude: "-122.0841"
  propertyType: "Single Family"
  bedrooms: "3"

Example 3 — Market snapshot

tool: rentcast
credential: my-rentcast
properties:
  mode: market
  zipCode: "78244"
  historyRange: "12"

Typical summary:

RentCast market snapshot for 78244:
  Sale:   median $245,000, avg DoM 38
  Rental: median $1,750/mo, avg DoM 22

Example 4 — Rental listings in an area

tool: rentcast
credential: my-rentcast
properties:
  mode: rental-listings
  zipCode: "78244"
  bedrooms: "3"
  limit: "10"

Errors you'll see

"RentCast apiKey missing from credential" — credential isn't set up or is missing the apiKey field
"RentCast auth failed — check the apiKey in your credential (HTTP 401)" — key is wrong or revoked
"RentCast rate limited or monthly quota exhausted (HTTP 429)" — you've hit the plan limit (50/month on free tier)
"rent-estimate: need either 'address' OR both 'latitude' and 'longitude'" — input validation
"market: 'zipCode' is required" — input validation

Rate limits and cost

Free tier: 50 API calls/month, 20 requests/second burst.
Paid tiers: start around $49/month for 1,000 calls.
Each mode = 1 API call. So pulling a rent estimate + market snapshot = 2 calls.
Log runs to track usage if you're on the free tier.

Chaining Patterns

geocode → rentcast (rent-estimate) — user types an address, geocode it, fetch rent estimate for that lat/lon
rentcast (rental-listings) → dataframe → email — weekly "what's available in my zip under $2000" report
rentcast (market) → ai — "is now a good time to sell in zip X based on the market snapshot?"
rentcast (value-estimate + rent-estimate) → condition → slack — monthly check on a rental property: alert if rent/price ratio drops

What this tool deliberately does NOT do

Property records lookup (GET /v1/properties) — the RentCast "properties" endpoint returns county-record data (ownership, tax, sale history). Useful but a different modality; can be added as a 5th mode later.
Sale listings (GET /v1/listings/sale) — parallel to rental-listings but for homes on the market. Same story — add later if needed.
AVM comparable listings detail — rent-estimate and value-estimate responses include a comparables array; this tool returns a count in the summary and the full array in response, but doesn't format each comp. Use response + dataframe if you need them.