Realie Property Data API vs HUD open data for AI agents
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. HUD open data is a set of government datasets about HUD-subsidized multifamily properties (an ArcGIS feature service) and Fair Market Rents (HUD USER API); not a listings API.
The short answer
- Realie Property Data API: Cheap, agent-friendly lookups of US parcel and owner records, not finding homes for sale or rent.
- HUD open data: Mapping subsidized apartment buildings and checking rents against HUD Fair Market Rents, not finding a vacant unit.
Side by side
| Realie Property Data API | HUD open data | |
|---|---|---|
| Searches | Properties and parcels by address, parcel ID, location or whole areas such as counties. | Locations and program details of HUD-subsidized multifamily properties; Fair Market Rent figures by area. |
| Returns | Property and parcel records with owner details and comparables. | Property locations and assistance-program attributes; FMR rent figures. No vacancy, availability or asking-rent fields are described. |
| Before the first call | A Realie account, an API key from the dashboard, and a payment method on file before sending API requests. | Nothing stated for the ArcGIS endpoint; the Fair Market Rents API needs a HUD USER account and an access token. |
| Free | Free plan: $0 a month with 25 tokens a month. | – |
| Paid | Tier 1: $50 a month for 1,250 tokens. | – |
| Acting on a result | Nothing: no agent or landlord contact is described (it has owner tools, not listing contacts). | Nothing: no property manager contact is described. |
| Coverage | US nationwide property data. | US |
| MCP server | 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 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.
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”
HUD open data, read on October 15, 2026:
- catalog.data.gov/dataset/multifamily-properties-assisted: “This dataset denotes HUD subsidized Multifamily Housing properties excluding insured hospitals with active loans.”