Repliers API vs ATTOM Property API 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. ATTOM Property API is a REST API for US property records: ownership, sales history, valuations (AVM and rental AVM), mortgages, schools, crime and neighborhood data.
The short answer
- Repliers API: Licensed agents and brokerages who want an AI-ready, MCP-connected API on top of their own MLS feed.
- ATTOM Property API: Deep public-record and valuation data on any US property, rather than finding homes currently on the market.
Side by side
| Repliers API | ATTOM Property API | |
|---|---|---|
| Searches | MLS listings from the boards you are licensed with (500+ boards listed), with sold data where your MLS agreement allows. | Properties by address, parcel number, ATTOM ID or latitude/longitude; the docs describe last sales, sales history and valuations, not active for-sale or rental listings. |
| Returns | Listing records including an agents field with contact information, brokerage affiliation and roles, plus office details. | JSON or XML property records with characteristics, ownership, sale history, AVM values and area data. |
| 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. | A trial sign-up to receive an API key; production plans through ATTOM. |
| Free | Preview plan: $0 a month, with sample data only. | 30-day free trial with an API key. |
| Paid | Standard plan: $199 a month (single MLS). | Not stated on its pages |
| Acting on a result | Listings include the listing agents' contact details (email, phones, website) and brokerage, as the MLS provides them. | Nothing: no agent, landlord or listing contact fields are described. |
| Limits on keeping or showing results | Not stated on its pages | Use of data is governed by a separate license agreement that is not published on the site. |
| Coverage | US and Canada, MLS by MLS (500+ boards listed). | US, 160+ million properties. |
| MCP server | Official open-source MCP server, hosted at https://mcp.repliers.io (repo: https://github.com/Repliers-io/mcp-server) | ATTOM MCP Server (access arranged through ATTOM): https://www.attomdata.com/solutions/delivery/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.
What do I need before I can use ATTOM Property API?
A trial sign-up to receive an API key; production plans through ATTOM.
Is ATTOM Property API free?
30-day free trial with an API key.
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”
ATTOM Property API, read on October 15, 2026:
- attomdata.com/solutions/property-data-api: “Sign up for a free 30-day trial to receive an API key and explore ATTOM’s extensive property data”
- attomdata.com/solutions/property-data-api: “Covering 160+ million U.S. properties and 99% of the U.S. population”
- attomdata.com/solutions/property-data-api: “ownership information, lat/long, square footage, loan types, sales history, sales comps, crime, schools and more”
- api.developer.attomdata.com/docs: “return information pertaining to the most recent sale of a property or list of properties”
- attomdata.com/solutions/property-data-api: “The ATTOM MCP Server provides AI-native access to ATTOM Intelligence through the Model Context Protocol (MCP).”
- attomdata.com/solutions/delivery/mcp-server/how-it-works: “Access is governed, permissioned, and centrally managed”
- attomdata.com/terms-of-use: “subject to the terms of a separate license agreement”