One Integration. Nationwide Coverage. Complete Listing Data.
The most comprehensive MLS listing integration. Complete, standardized data from every market via a single integration.*
*As per the licensure granted by Multiple Listing Services
*As per the licensure granted by Multiple Listing Services
North American Coverage
One Seamless Pipeline, Start to Finish
Step 1
Use Case Validation
We start by understanding your product, data requirements, and target markets. Our team evaluates your use case against MLS policies and licensing frameworks to confirm eligibility, identify the right data sources, and define a clear path to production.
Step 2
Data Standardization
Every field mapped to RESO Data Dictionary standards. Consistent property types, status values, and measurement units across all markets. Zero data loss or field omission
Step 3
Flexible Data Delivery
Access data your way: GraphQL APIs, continuous streaming, webhooks, or cloud data shares (Snowflake, S3, Azure, GCP). Choose what fits your architecture
Step 4
Routine auditing and reporting for compliance
Automated monitoring tracks usage against provider requirements. Our team handles audits, reporting, and policy updates so you stay compliant without operational overhead
Built for Scale. Designed for Accuracy
Complete National Coverage
Direct integrations with every prominent MLS in North America. No gaps, no geographic limitations.
- Nationwide MLS partnerships
- All property types: residential, land, rental
- 4M+ Active listings
- Continuous expansion as new sources become available
Near Real-Time Data Updates
Under 5-minute average update latency. Your application always shows current data.
- Continuous ingestion from all sources
- Sub-minute latency in major markets
- Automatic failover ensures uninterrupted flow
- 24/7 monitoring and rapid issue resolution
RESO
Standardization
Consistent field names and data types across all sources. Build once, deploy nationwide.
- Full RESO data dictionary compliance
- Unified standards
- Standardized addresses and coordinates
- Continuous mapping refinement as standards evolve
Every Detailed Preserved
Every licensed field delivered in full. No summaries, no omissions, no "unimportant" fields stripped away.
- Complete property details and characteristics
- All media: photos, videos, virtual tours, documents
- Full status and pricing history
- Historical archives for market analysis
- Original source fields preserved alongside standardized data
Flexible Integration Options
Choose the delivery method that fits your architecture. API for real-time queries. Batch files for analytics.
- GraphQL APIs with <100ms p50 latency
- Real-time event streams (Kafka, Kinesis, Event Hubs)
- Batch delivery (JSON, CSV, Parquet, Avro)
- Native cloud integration (Snowflake, S3, Azure, GCP)
Managed Compliance
Full-service compliance management included. We handle provider relationships, monitor usage, and manage audits.
- Dedicated compliance team managing all relationships
- Automated monitoring and enforcement
- Audit coordination and documentation
- Proactive notification of policy changes
Full-Service Compliance
Licensing Coordination
Established relationships with sources accelerating resolution. We coordinate application and review, and ongoing renewals. Typical timeline: 3-8 days vs. months if done independently.
Regulatory Compliance
Automated systems monitor attribution, display rules, and usage against rules and regulations. Our team handles audits, reporting, and policy updates across all markets.
Risk Mitigation
Proactively manage risk through comprehensive, high-integrity data solutions and rigorous validation standards. Our audit-ready controls, and secure distribution practices ensure that clients operate with confidence—minimizing operational, financial, and regulatory risk.
Trusted Across the Real Estate Ecosystem
Property Search Platforms
Power property search with complete listings, rich media, and real-time updates.
Agent & Brokerage Tools
CRM, market analysis, and client collaboration tools for real estate professionals.
AVMs & Pricing Intelligence
AVM inputs with full property details, pricing history, and market context.
Market Research & Intelligence
Research and reporting on inventory, trends, and competitive intelligence.
Lending & Loan
Origination
Loan origination integration with property details and market validation.
Investment & Portfolio Intelligence
Deal sourcing, portfolio management, and rental market analysis.
Ready to integrate with Constellation Data Labs?
Schedule a call to explore our data solutions
The Constellation Data Labs Difference
Unmatched Coverage
We maintain direct connections to more MLS systems than any other provider. If a feed exists, we have it or can add it within days.
Data Fidelity You Can Trust
Every licensed field delivered intact. Built-in validation catches issues before they reach production. Enterprise clients rely on our data for valuation models, underwriting, and compliance.
True Real-Time Performance
Our infrastructure processes updates from MLS sources continuously. Sub-minute latency means your users see listings the moment they go active. No batch delays, no stale data.
- Continuous monitoring and ingestion
- Automatic failover and redundancy
- 24/7 support
Frequently Asked Questions
1. What is an MLS?
An MLS (Multiple Listing Service) is a database system used by real estate professionals to share information about properties for sale. MLSs allow listing agents to publish property details, photos, and pricing, while buyer agents use them to search for available inventory on behalf of their clients. There are hundreds of MLSs operating across the United States and Canada, each serving a specific geographic region. Constellation Data Labs provides a service where customers with proper licensing can gain access to this data in a compliant manner
2. Why do I need data licensing to access listing data?
MLS data is protected and can only be accessed by authorized parties. Scraping is illegal, using it without proper licensing is a violation of MLS rules, and it can lead to serious consequences, including fines, feed suspension, or legal action.
3. Is your data standardized to the RESO Data Dictionary?
Yes. All listing data delivered through our platform is fully standardized to the RESO (Real Estate Standards Organization) Data Dictionary. That means fields like property type, pricing, status, and location follow a consistent structure—regardless of the source.
This high level of standardization simplifies integration, reduces time spent on mapping or translation, and ensures compatibility across tools, platforms, and regions. Whether you’re powering search, analytics, or workflows, RESO-standardized data helps you scale faster and build with confidence.
4. How often is the data refreshed?
The majority of listings are refreshed every 5 minutes.
5. What formats and delivery methods do you support?
Our data delivery is built to adapt to your architecture—not the other way around—so integration is smooth, scalable, and on your terms. Whether you’re streaming updates, replicating datasets, or delivering rich media at scale, we make it easy to put your data to use. We support multiple delivery options, including real-time APIs, streaming updates, and direct cloud sharing via Snowflake, S3, and more.
Get Started with Constellation Data Labs
Schedule a call to explore our data solutions
