Repliers API vs HUD open data for AI agents
Repliers API is a real estate data API that connects to US and Canadian MLSs and serves their listings through one REST API, with AI search features and an official MCP server. 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
- Repliers API: Licensed agents and brokerages who want an AI-ready, MCP-connected API on top of their own MLS feed.
- HUD open data: Mapping subsidized apartment buildings and checking rents against HUD Fair Market Rents, not finding a vacant unit.
Side by side
| Repliers API | HUD open data | |
|---|---|---|
| Searches | MLS listings from the boards you are licensed with (500+ boards listed), with sold data where your MLS agreement allows. | Locations and program details of HUD-subsidized multifamily properties; Fair Market Rent figures by area. |
| Returns | Listing records including an agents field with contact information, brokerage affiliation and roles, plus office details. | Property locations and assistance-program attributes; FMR rent figures. No vacancy, availability or asking-rent fields are described. |
| Before the first call | A Repliers account and API key; production data requires being a licensed real estate agent with a data agreement with your MLS. | Nothing stated for the ArcGIS endpoint; the Fair Market Rents API needs a HUD USER account and an access token. |
| Free | Preview plan: $0 a month, with sample data only. | – |
| Paid | Standard plan: $199 a month (single MLS). | – |
| Acting on a result | Listings include the listing agents' contact details (email, phones, website) and brokerage, as the MLS provides them. | Nothing: no property manager contact is described. |
| Coverage | US and Canada, MLS by MLS (500+ boards listed). | US |
| MCP server | Official open-source MCP server, hosted at https://mcp.repliers.io (repo: https://github.com/Repliers-io/mcp-server) | – |
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 Repliers API?
A Repliers account and API key; production data requires being a licensed real estate agent with a data agreement with your MLS.
Is Repliers API free?
Preview plan: $0 a month, with sample data only.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Repliers API, read on October 15, 2026:
- repliers.com/plans-and-pricing: “Build and test your proof of concept with sample data. Upgrade to unlock production data when ready.”
- repliers.com: “Yes, Repliers integrates with MLS® platforms, requiring users to be licensed real estate agents.”
- repliers.com/faqs: “data agreements are still required with your MLS”
- repliers.com: “With Repliers, you can connect to any MLS in the U.S. or Canada.”
- help.repliers.com/en/article/understanding-the-data-in-a-listings-response-v0gh0d: “contact information, brokerage affiliation, and roles”
- repliers.com: “Connect Claude, Cursor, ChatGPT, or any MCP client straight to live MLS listings.”
- repliers.com/repliers-mcp-server: “The Repliers MCP Server connects the full power of the Repliers real estate API”
- repliers.com/plans-and-pricing: “$0 / month Preview Build and test your proof of concept with sample data”
- repliers.com/plans-and-pricing: “$199 / month Standard”
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.”