RentCast API vs Realie Property Data API for AI agents
RentCast API is a self-serve REST API for US property records, value and rent estimates, market data, and active sale and rental listings. Realie Property Data API is a US property data API (REST, CLI and MCP) for parcel lookup, property search, owners and comparables; its docs describe property records, not MLS listings.
The short answer
- RentCast API: The quickest self-serve way to search active US rentals and for-sale homes with agent contacts, without MLS paperwork.
- Realie Property Data API: Cheap, agent-friendly lookups of US parcel and owner records, not finding homes for sale or rent.
Side by side
| RentCast API | Realie Property Data API | |
|---|---|---|
| Searches | Active sale and rental listings by city or area with filters, plus 150+ million property records, valuations and market trends. | Properties and parcels by address, parcel ID, location or whole areas such as counties. |
| Returns | Listing records with address, coordinates, property type, beds, baths, size, price or rent, status, days on market, MLS name and number, history, and listing agent and office. | Property and parcel records with owner details and comparables. |
| Before the first call | A RentCast account and an API key from the dashboard; no MLS membership or license. | A Realie account, an API key from the dashboard, and a payment method on file before sending API requests. |
| Free | Developer plan: 50 API calls a month for $0. | Free plan: $0 a month with 25 tokens a month. |
| Paid | Foundation plan: $74 a month for 1,000 requests. | Tier 1: $50 a month for 1,250 tokens. |
| Acting on a result | Listings include the listing agent's and listing office's name, phone, email and website; no landlord contact is described. | Nothing: no agent or landlord contact is described (it has owner tools, not listing contacts). |
| Limits on keeping or showing results | The API terms allow storing API data in your own systems and redistributing it only as the license section permits; no attribution is required. | Not stated on its pages |
| Coverage | US nationwide; listings are gathered from public sources, not directly from MLSs. | US nationwide property data. |
| MCP server | Official hosted MCP server: https://developers.rentcast.io/mcp | Official MCP server: https://app.realie.ai/api/mcp (OAuth sign-in) |
Where Openpath fits
Openpath has no homes listed yet. Owners and landlords can list a home for rent or sale on Openpath today, free, and agents will find it through the same search as jobs and businesses. Get listed.
Questions people ask
What do I need before I can use RentCast API?
A RentCast account and an API key from the dashboard; no MLS membership or license.
Is RentCast API free?
Developer plan: 50 API calls a month for $0.
What do I need before I can use Realie Property Data API?
A Realie account, an API key from the dashboard, and a payment method on file before sending API requests.
Is Realie Property Data API free?
Free plan: $0 a month with 25 tokens a month.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
RentCast API, read on October 15, 2026:
- rentcast.io/api: “Our pricing plans start with 50 free API calls per month”
- rentcast.io/api: “$ 74 Per Month”
- rentcast.io/api: “Active sale and rental listings across the country.”
- developers.rentcast.io/reference/introduction: “To get started, create a RentCast account to access your API dashboard and generate your first API key.”
- developers.rentcast.io/reference/introduction: “We have nationwide coverage for most residential properties and select commercial property types in the US”
- developers.rentcast.io/reference/property-listings: “the names and contact information of the listing agent, the listing office or broker”
- developers.rentcast.io/reference/property-listings: “we do not retrieve our property listing data directly from the MLS”
- rentcast.io/terms-api: “and (v) to incorporate and store the API Data within your internal systems”
- rentcast.io/terms-api: “neither use of the RentCast API nor use of the API Data requires attribution”
- developers.rentcast.io/reference/ai-tools: “The RentCast API MCP server is hosted at https://developers.rentcast.io/mcp.”
Realie Property Data API, read on October 15, 2026:
- docs.realie.ai/api-reference/pricing: “$0 / Month ... 25 Tokens / Month”
- docs.realie.ai/api-reference/pricing: “$50 / Month ... 1,250 Tokens / Month”
- docs.realie.ai/api-reference/faq: “Add a payment method from Billing before sending API requests.”
- docs.realie.ai: “accessing nationwide property data programmatically”
- docs.realie.ai/api-reference/property-data: “A flexible way to paginate through large areas (such as entire counties) to collect all relevant data.”
- docs.realie.ai/realie-mcp-server: “https://app.realie.ai/api/mcp”