RentCast

RentCast provides a real estate data API with instant access to over 140 million property records, automated valuation models (AVM) for home value and rent estimates, active and historical sale and rental listings, and aggregate real estate market statistics for US zip codes. The API enables real estate investors, property managers, landlords, and proptech applications to programmatically access comprehensive residential and commercial property data across all 50 US states.

RentCast publishes 4 API contracts indexed on the APIs.io network, including Avm API, Listings API, Markets API, and 1 more. Tagged areas include Real Estate, Property Data, Valuation, Rental Market, and AVM.

The RentCast catalog on APIs.io includes 1 JSON-LD context and 2 Spectral governance rulesets.

RentCast’s developer surface includes authentication, developer portal, documentation, support, engineering blog, and 10 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

37.0/100 thin ▬ flat Agent 31/100 agent ready Front door AI 1/6 silent Heartbeat 32/100 slowing Full breakdown ↓
scored 2026-11-13 · rubric v0.28.0 · Show this score on your site →

AccessFreemiumSelf serve⚡ Free to try

1 published contract

Real Estate Property Data ValuationRental MarketAVM

What this lets a business do 2

Business capabilities this provider's published APIs can perform, derived from its own contracts. Browse all capabilities →

Real Estate Valuation & Appraisal Management

BC-4970

Avm

GET /avm/value GET /avm/rent/long-term

Real Estate Brokerage Management

BC-4960

Listings

GET /listings/sale GET /listings/rental/long-term

Kin Score

Kin Score How this is scored →
scored 2026-11-13 · rubric v0.28.0

Composite quality — 37.0/100 · thin

Contract Quality 14.1 / 21

Developer Ergonomics 6.5 / 17

Access Clarity 1.1 / 17

Operational Transparency 1.3 / 11

Contract Governance 2.8 / 10

Discoverability 6.2 / 9

Regulatory Posture 1.6 / 15

Agent readiness — 31/100 · agent ready

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 6 / 6

MCP Server 0 / 12

Machine-Readable Auth 10 / 10

Idempotency 9 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 4 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

Create-or-Update Ergonomics does not apply to this provider. The published contracts declare no write operations, and a read-only API cannot create-or-update. The facet is excluded from this provider's denominator entirely — not scored zero. A reference or data API is not deficient for being unable to upsert.

The six quality facets above are damped to 85 points between them, because the conditional facet above carries the other 15. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 85% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship Ask about this →
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes Ask about this →
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0 Ask about this →
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document Ask about this →
Delegated User Identity +6 pts — a served discovery document listing authorization_code in grant_types_supported (served), else an oauth2 authorizationCode flow or openIdConnect declared in an OpenAPI (documented) Ask about this →
Typed Event Surface +6 pts — AsyncAPI document, OR webhooks/callbacks objects in the as-published OpenAPI, OR common[].type includes Webhooks Ask about this →

5 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 6.4 — up to +18.7 composite points Ask about this →
Developer Ergonomics scores 38.1 — up to +12.4 composite points Ask about this →
Operational Transparency scores 11.9 — up to +11.5 composite points Ask about this →

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from the provider profile at artifacts.apis.io/rentcast/apis.yml: open an issue on github.com/api-evangelist/rentcast to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Real Estate and Proptech	long-tail	5.9	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

APIs 4

Individual APIs this provider publishes, each with its own machine-readable definition.

RentCast Avm API

The Avm API from RentCast — 2 operation(s) for avm.

RentCast Listings API

The Listings API from RentCast — 4 operation(s) for listings.

RentCast Markets API

The Markets API from RentCast — 1 operation(s) for markets.

RentCast Properties API

The Properties API from RentCast — 3 operation(s) for properties.

Open Collections 5

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

RentCast Avm API

OPEN COLLECTION

RentCast Avm Listings API

OPEN COLLECTION

RentCast Avm Markets API

OPEN COLLECTION

RentCast Avm Properties API

OPEN COLLECTION

RentCast API

OPEN COLLECTION

RentCast API pricing

Not yet checked against RentCast's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against RentCast's documentation. All 5 limits →

Pricing Plans 1

Published pricing tiers and plan structures.

RentCast Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

RentCast Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

RentCast Finops

FINOPS

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Rentcast Context

22 classes · 9 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs. Counts are the severity each rule declares, not results of running them.

RentCast — jsonschema rules

5 rules · 3 warn-severity 2 info-severity

SPECTRAL

RentCast API Rules

7 rules · 2 error-severity 3 warn-severity

SPECTRAL

JSON Schema 2

Standalone JSON Schema definitions for this provider's data models.

RentCast Property Estimate

6 properties

JSON SCHEMA

RentCast Property Record

21 properties

JSON SCHEMA

JSON Structure 1

JSON Structure definitions describing this provider's data shapes.

RentCast Property Structure

0 properties

JSON STRUCTURE

Examples 2

Example request and response payloads for these APIs.

RentCast Property Search Example

4 fields

EXAMPLE

RentCast Rent Estimate Example

4 fields

EXAMPLE

Security Posture 2

Authentication, domain security, vulnerability disclosure, and trust-center signals.

RentCast Authentication

apiKey · 1 scheme

SECURITY

RentCast Domain Security

TLSv1.3 · HSTS · DMARC

SECURITY

Agentic Access (API Evangelist recommendations) 1

Recommended x-agentic-access execution contracts for AI agents.

RentCast Agentic Access

10 operations

10 operations · 0 acting

AGENTIC

Resources

Get Started 2

Portal, sign-up, and the first successful call

Portal

Portal

Portal

Portal

Documentation 1

Reference material describing how the API behaves

Documentation

Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

LlmsText

LlmsText

Build 1

SDKs, sample code, and the tooling you integrate with

GitHubOrganization

GitHubOrganization

Access & Security 2

Authentication, authorization, and security posture

DomainSecurity

DomainSecurity

Authentication

Authentication

Operate 2

Status, limits, changes, and where to get help

RateLimits

RateLimits

Support

Support

Commercial 2

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

Company 2

The organization behind the API

Website

Website

Blog

Blog

Other 1

Properties that don't map to a standard resource type

CapabilityMap

CapabilityMap

Source (apis.yml)

aid: rentcast
name: RentCast
description: RentCast provides a real estate data API with instant access to over 140 million property records, automated
  valuation models (AVM) for home value and rent estimates, active and historical sale and rental listings, and aggregate
  real estate market statistics for US zip codes. The API enables real estate investors, property managers, landlords, and
  proptech applications to programmatically access comprehensive residential and commercial property data across all 50 US
  states.
type: Index
deliveryModel:
  model: unknown
  open_source: false
  commercial: false
  callable_host: true
  label: Delivery model not determined — needs a product licence on record
  confidence: low
  source:
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: self-serve
  trial: false
  try_now: true
  public: false
  gated: none
  gated_source:
  - onboarding
  label: Freemium · Self-serve signup
  confidence: medium
  source:
  - plans
  - authentication
  - security
  generated: '2026-11-13'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/rentcast.png
x-docs-platform: readme
x-docs-platform-confidence: high
x-docs-platform-checked: 2026-10-04
tags:
- Real Estate
- Property Data
- Valuation
- Rental Market
- AVM
tags_raw:
- Real Estate
- Property Data
- Valuation
- Rental Market
- AVM
- Real-Estate
url: https://raw.githubusercontent.com/api-evangelist/rentcast/refs/heads/main/apis.yml
created: '2025-03-01'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: rentcast:rentcast-avm-api
  name: RentCast Avm API
  description: The Avm API from RentCast — 2 operation(s) for avm.
  humanURL: https://www.rentcast.io/api
  baseURL: https://api.rentcast.io/v1
  tags:
  - AVM
  tags_raw:
  - Avm
  properties:
  - type: OpenAPI
    url: openapi/rentcast-avm-api-openapi.yml
  - type: Documentation
    url: https://developers.rentcast.io/reference/introduction
  - type: PostmanCollection
    url: https://www.postman.com/rentcast/rentcast-api/documentation/ca4yudw/rentcast-api-endpoints
  - type: GitHubOrganization
    url: https://github.com/RentCast
  - type: Rules
    url: rules/rentcast-rules.yml
  - type: JSONSchema
    url: json-schema/rentcast-property-schema.json
  - type: JSONStructure
    url: json-structure/rentcast-property-structure.json
  - type: JSONLD
    url: json-ld/rentcast-context.jsonld
  - type: Vocabulary
    url: vocabulary/rentcast-vocabulary.yml
- aid: rentcast:rentcast-listings-api
  name: RentCast Listings API
  description: The Listings API from RentCast — 4 operation(s) for listings.
  humanURL: https://www.rentcast.io/api
  baseURL: https://api.rentcast.io/v1
  tags:
  - Listings
  properties:
  - type: OpenAPI
    url: openapi/rentcast-listings-api-openapi.yml
  - type: Documentation
    url: https://developers.rentcast.io/reference/introduction
  - type: PostmanCollection
    url: https://www.postman.com/rentcast/rentcast-api/documentation/ca4yudw/rentcast-api-endpoints
  - type: GitHubOrganization
    url: https://github.com/RentCast
  - type: Rules
    url: rules/rentcast-rules.yml
  - type: JSONSchema
    url: json-schema/rentcast-property-schema.json
  - type: JSONStructure
    url: json-structure/rentcast-property-structure.json
  - type: JSONLD
    url: json-ld/rentcast-context.jsonld
  - type: Vocabulary
    url: vocabulary/rentcast-vocabulary.yml
- aid: rentcast:rentcast-markets-api
  name: RentCast Markets API
  description: The Markets API from RentCast — 1 operation(s) for markets.
  humanURL: https://www.rentcast.io/api
  baseURL: https://api.rentcast.io/v1
  tags:
  - Markets
  properties:
  - type: OpenAPI
    url: openapi/rentcast-markets-api-openapi.yml
  - type: Documentation
    url: https://developers.rentcast.io/reference/introduction
  - type: PostmanCollection
    url: https://www.postman.com/rentcast/rentcast-api/documentation/ca4yudw/rentcast-api-endpoints
  - type: GitHubOrganization
    url: https://github.com/RentCast
  - type: Rules
    url: rules/rentcast-rules.yml
  - type: JSONSchema
    url: json-schema/rentcast-property-schema.json
  - type: JSONStructure
    url: json-structure/rentcast-property-structure.json
  - type: JSONLD
    url: json-ld/rentcast-context.jsonld
  - type: Vocabulary
    url: vocabulary/rentcast-vocabulary.yml
- aid: rentcast:rentcast-properties-api
  name: RentCast Properties API
  description: The Properties API from RentCast — 3 operation(s) for properties.
  humanURL: https://www.rentcast.io/api
  baseURL: https://api.rentcast.io/v1
  tags:
  - Properties
  properties:
  - type: OpenAPI
    url: openapi/rentcast-properties-api-openapi.yml
  - type: Documentation
    url: https://developers.rentcast.io/reference/introduction
  - type: PostmanCollection
    url: https://www.postman.com/rentcast/rentcast-api/documentation/ca4yudw/rentcast-api-endpoints
  - type: GitHubOrganization
    url: https://github.com/RentCast
  - type: Rules
    url: rules/rentcast-rules.yml
  - type: JSONSchema
    url: json-schema/rentcast-property-schema.json
  - type: JSONStructure
    url: json-structure/rentcast-property-structure.json
  - type: JSONLD
    url: json-ld/rentcast-context.jsonld
  - type: Vocabulary
    url: vocabulary/rentcast-vocabulary.yml
common:
- type: Plans
  url: plans/rentcast-plans-pricing.yml
- type: RateLimits
  url: rate-limits/rentcast-rate-limits.yml
- type: FinOps
  url: finops/rentcast-finops.yml
- type: CapabilityMap
  url: capabilities/rentcast-capability-edges.yml
  name: RentCast Business Capability Map
- type: AgenticAccess
  url: agentic-access/rentcast-agentic-access.yml
- type: DomainSecurity
  url: security/rentcast-domain-security.yml
- type: Authentication
  url: authentication/rentcast-authentication.yml
- url: https://www.rentcast.io
  name: RentCast
  type: Website
  description: RentCast real estate data platform homepage
- url: https://developers.rentcast.io
  name: RentCast Developer Portal
  type: Portal
  description: API documentation and developer resources
- url: https://app.rentcast.io/app/api
  name: RentCast API Dashboard
  type: Portal
  description: API key management and usage dashboard
- url: https://www.rentcast.io/api
  name: RentCast API
  type: Documentation
  description: Overview of RentCast API features and pricing
- url: https://help.rentcast.io
  name: RentCast Help Center
  type: Support
  description: Help articles and support documentation
- url: https://www.rentcast.io/blog
  name: RentCast Blog
  type: Blog
  description: Product updates and real estate data insights
- url: https://github.com/RentCast
  name: RentCast GitHub
  type: GitHubOrganization
  description: OpenAPI specs, Postman collections, and developer resources
- type: LlmsText
  url: https://developers.rentcast.io/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

RentCast API — frequently asked questions

Does RentCast have an API?

Yes. APIs.io lists 4 APIs from RentCast, including RentCast Avm API, RentCast Listings API and RentCast Markets API, and 1 more.

Is there an OpenAPI specification for the RentCast API?

Yes. APIs.io indexes 4 OpenAPI specifications for RentCast, each linked for download from this page.

How do I authenticate with the RentCast API?

RentCast uses bearer-token authentication (apiKey · 1 scheme). The details are profiled on APIs.io as RentCast Authentication.

How much does the RentCast API cost?

APIs.io lists 3 pricing plans for RentCast, with each plan's price, limits and inclusions under Pricing on this page.

Is the RentCast API ready for AI agents?

RentCast has a Kin Score of 37.0 out of 100 (thin) and an Agent Readiness score of 31.2 (agent-ready), scored by API Evangelist on 2026-11-13.

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