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IDX & Data Feed Overview

IDX (Internet Data eXchange) Program

What is it?

IDX is a program allowing MLS Participants (broker-owners) to give each brokerage participating in the program permission to display each other’s listings on the broker’s company website(s) (subject to the rules of UNYREIS and NYSAMLSs).

All broker-owners who are MLS participants automatically become IDX participants and their listings are included in the UNYREIS IDX database. A participant may ‘Opt Out’ to not allow their listings to be included in the IDX database, but they lose the benefit of displaying IDX listings on their company website if they do so.

What does it cost?

UNYREIS does not charge a fee for any portion of the IDX program.

How Do I Get Started?

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Broker OwnersAgents
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Broker Owners

View the NYSAMLSs Broker-Vendor Resource Guide which includes our IDX Rules.

Broker-owners have two options for participating in the IDX program.  Your vendor may request a raw data feed via the CoreLogic Trestle platform or you may use the IDX Property Search Link that is available via Matrix.

  1. TRESTLE – The New York State Alliance of MLSs uses the Trestle™ Data Management Platform from CoreLogic® to distribute data.   Your vendor will need to have or set up an account on Trestle for the New York State Alliance of MLSs (NYS) connection.  For IDX, we use a Data License Agreement that includes data for all three of the participating MLSs in our database for IDX.   UNYREIS does not charge a fee at this time, but there is a vendor fee charged by CoreLogic via Trestle. Other things to know:
  • The New York State Alliance of MLSs is a joint venture of the Central New York Information Service Inc (CNYIS, Syracuse), Upstate New York Real Estate Information Services LLC (UNYREIS, Rochester), and Western New York Real Estate Information Services LLC (WNYREIS – Buffalo).
  • Our MLS database also contains several other MLSs in the region (Chautauqua-Cattaraugus, Cortland, Ithaca*, Jefferson Lewis, McKean PA, Mohawk Valley, Otsego Delaware and coming in February, 2025, Elmira-Corning).
    • *Note – The Ithaca Board MLS data may be obtained via a separate Trestle Account under the Ithaca Board of REALTORS®. The rest of the MLSs is found within the New York State Alliance of MLS’s Trestle account.</
  • NYS offers IDX Web API and IDX Web API Plus feeds via Trestle.
  • The vendor starts the procedure and adds the broker’s name and email address (and agent’s name and email, if applicable) to the connection. All approvals are handled via AuthentiSign and originated in Trestle.
  • Vendors enjoy these benefits from Trestle:
    • Consistent metadata across all MLS Organizations.
    • Standardized field names to comply with RESO Data Dictionary Standards – reduces the cost of mapping.
    • Single point of query – They can pull data from New York. California and North Carolina in the same query.
    • Developer Support via Email and Slack Channels for support (email Trestle Support to request access).
  • Forward this info to the web developer that is doing your website:
    • View this link to learn how to start pulling data from Trestle.
    • Reach out to Trestle Support for any questions/concerns or contact our IDX Dept staff at idx@grar.net.

2. IDX Frame-able Link via Matrix and or Matrix Agent Webpage-The IDX option in Matrix allows you to create an iFrame link for your website to allow your clients to search from the MLS. This option is for those who have a website where they can edit the content and web pages. If you do not have a website, check out the Agent Web Page option. It gives you the basic functionality of a website without having to develop one.

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Agents

Agents also have two options for displaying IDX listings on their web pages.  While they may not request a data feed directly from UNYREIS/NYS, an agent may request that their vendor obtain a data feed via Trestle (see above) to use for a custom IDX webpage. All agent implementations should be coordinated with your broker who will be a signer and need to approve the connection and your vendor.  Please provide your vendor with your broker’s name and email so that they may include them in the signing.  UNYREIS does not provide agent level support, as the IDX program is a Broker-Owner program per NAR mandate.

Additionally, agents may also use the Agent Webpage or IDX features of Matrix.  See IDX Search Links and Personal Websites Created in Matrix to get started.

Third Party National Portal Data Feeds

All UNYREIS MLS listings get syndicated to Realtor.com unless the broker has opted out of that program (to do so, email GRARHelpDesk@grar.net).

See our 3rd Party Website Tips and Tricks for some things to know about syndicating to Realtor.com

Note – the broker may be able to syndicate to more national sites by establishing an account on ListHub.

Questions?

Contact GRAR IDX Department and/or Trestle Support

GRAR does not provide technical or user support for Trestle. If you feel that there is missing data or the process is not updating, please contact for any questions/concerns.

Otherwise, please refer to the resource documents provided below.

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