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Protecting MLS data means governing both how systems access and exchange it and what recipients are authorized to do with it. RESO standards can make data more interoperable; documented access procedures can make feed requests clearer; and locally negotiated agreements can set the terms for vendor use. None of those measures, by itself, establishes a universal ownership rule or settles every licensing question.
The scale of adoption makes the issue operationally important, but published progress figures are not a valuation of MLS data. The practical task for MLS and brokerage leaders is to keep legitimate access useful while defining the technical and contractual boundaries around it.
What does it mean to protect MLS data?
In this context, protection is not a single technical control or policy. It involves at least three connected decisions: which people and systems can access a feed, how consistently that feed can be used by different software, and what the recipient is permitted to do under the applicable agreement and local rules.
These decisions solve different problems. A standardized interface can reduce the work required for systems to exchange data, but it does not grant a vendor permission to use that data for every purpose. Conversely, a detailed license does not make a locally customized feed easy for different software to interpret. Effective governance needs both workable access and clear authorization.
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The available figures show broad adoption and migration activity, not a dollar value. RESO reported on January 29, 2026, that Data Dictionary 2.0 certification covered more than one million MLS subscribers, or 63% of U.S. subscribers. In the same retrospective on 2025 accomplishments, RESO said the transition from RETS to RESO Web API was 60% complete, with 74% committed, across feeds covering more than one million subscribers. These are RESO-reported progress snapshots, not live counts or independent estimates of financial value.
How do standards help—and what do they not decide?
RESO Data Dictionary
RESO’s Data Dictionary defines thousands of industry-approved fields and details intended to help real estate systems work together. Aligning data structures can reduce the translation effort between systems and the risk that a field is interpreted differently in different tools.
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RESO Web API
Web API standardizes how systems request and return data. RESO certification tests whether an implementation processes standardized requests and provides standardized responses. RESO also offers open-source testing tools, a client SDK, and a reference implementation. Its certification reports cover metadata, standard resources and fields, custom local fields, data availability, and server performance.
Certification is evidence of technical conformance within the tested scope; it is not a license to access a particular MLS’s data. Data rights, permitted uses, and access conditions still depend on applicable MLS policies and agreements.
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NAR’s MLS best-practice guidance recommends that MLSs offer RESO Web API as the primary access method and move toward retiring other feed methods, including RETS. It also recommends working with vendors and leadership on a conversion plan. A transition can improve compatibility, but implementation still requires coordination among the MLS, vendors, and affected users.
| Approach | What it helps solve | What it does not settle |
|---|---|---|
| RESO Web API and Data Dictionary conformity | More consistent requests, responses, and field interpretation across compliant systems; potentially less mapping work. | Who is authorized to receive data or what a recipient may do with it. |
| Older or locally customized feed practices | Can support existing local systems and workflows. | May require more translation or coordination when systems use different structures; the exact burden depends on the implementations. |
| Documented feed-request procedures | Clarify who can request access, the available feed types, and the information each provides. | Do not replace the applicable license or determine rights beyond the stated policy and agreement. |
| Locally negotiated vendor license | Sets terms for the specific parties and their intended relationship. | A generic template cannot determine every party’s legal needs or replace counsel. |
How do I request an MLS data feed?
NAR’s MLS best practices recommend that MLSs provide written instructions for requesting feeds and explain the types of feeds and information available. The guidance also recognizes that feeds may serve participants, subscribers, their designees, and vendors so brokers and licensees can provide services to clients.
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- Find the MLS’s written feed-request process. Confirm who is eligible to submit the request and what information or authorization the MLS requires. The applicable local instructions govern the request.
- Identify the feed type and data needed. Ask which fields and information are available in each feed rather than assuming all feeds expose the same data.
- Confirm the technical method. NAR recommends RESO Web API as the primary access method. If an existing integration uses another method, ask about the MLS’s conversion plan and timing.
- Establish the permitted use and support path. Clarify the applicable agreement, the responsible contacts, and how operational questions or changes will be handled.
NAR also recommends sharing aggregated data for statistical purposes where available. That is best-practice guidance, not a claim that every MLS offers the same aggregate data or access terms.
How should MLS data be licensed to a software vendor?
The agreement should be specific to the parties and their intended arrangement; an API specification or certification does not substitute for it. NAR provides a non-exhaustive checklist of issues to consider when an MLS or participant enters an agreement with a third-party software vendor, along with a sample data license agreement.
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NAR explicitly says the sample is not legal advice, should not replace advice from counsel, and needs modification for the parties’ particular legal needs. Local MLS licenses and rules can differ. The checklist should therefore be treated as a starting point for review—not as a complete or universally applicable set of required clauses. Have counsel assess the actual agreement and applicable local requirements.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What changed in NAR’s MLS policy guidance for 2026?
NAR said it completed a comprehensive antitrust risk assessment of MLS policies in 2025. A Presidential Advisory Group proposed 18 recommendations, which NAR announced as approved for the 2026 Handbook in November 2025, with changes taking effect in January 2026. NAR described themes that include greater local discretion, modernization of administration and operations, and removal of outdated enforcement practices. Its MLS Risk Mitigation resource frames the changes as intended to mitigate legal risks while limiting disruption.
These announcements describe policy updates and themes; they do not establish that every local MLS adopted identical provisions or has the same access arrangements. Kevin Sears, then NAR immediate past president, said in NAR’s November 17, 2025 announcement: “These updates to the MLS Handbook strengthen and modernize NAR’s policies and reflect our efforts to align MLS policies with how real estate professionals do business today.” The statement concerns the handbook changes, not cybersecurity or data ownership.
Quick Recap
What should industry leaders do next?
- Make access understandable. Publish the request process, eligibility expectations, available feed types, and the information each provides, as NAR recommends.
- Plan the technical transition. Where feeds have not moved to RESO Web API, coordinate conversion planning with vendors and leadership rather than treating a standards change as an isolated software task.
- Separate technical conformance from permission. Use RESO tools and certification to assess implementation against standards, and use the applicable policy and license to establish authorization and permitted use.
- Review agreements locally. Use NAR’s checklist and sample as reference materials, not a substitute for counsel or for adapting terms to the parties’ circumstances.
- Apply policy changes through local governance. Read the 2026 Handbook provisions and relevant local rules rather than assuming that a national announcement describes every MLS’s implementation.
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