Redfin Data Center vs Spark API for AI agents
Redfin's Data Center offers downloadable US housing market statistics; Redfin publishes no listings API. FBS's Spark API and RESO Web API give authorized applications access to MLS data on the Flexmls/Spark platform.
The short answer
- Redfin Data Center: Free-to-download market trend data (prices, inventory, delistings) for research and charts, not finding a specific home.
- Spark API: Apps built for agents, brokers or MLSs that use Flexmls, where the MLS member authorizes access.
Side by side
| Redfin Data Center | Spark API | |
|---|---|---|
| Searches | Market-level series such as the Housing Market Tracker (weekly and monthly), Redfin Home Price Index, price drops, delistings and investor purchases; not individual homes. | MLS listings (and, for VOW apps, sold data) from participating MLSs, within the roles each MLS grants. |
| Returns | Download files where each row is one region for one time period. | MLS listing records in Spark or RESO Web API format. |
| Before the first call | Nothing stated; the data is a download button on the page. | A free developer account, then an MLS data plan or an MLS member who authorizes your app. |
| Free | – | Developer account sign-up is free. |
| Paid | – | $50 a month for each MLS you access, once you have data from your first MLS (MLS data plans may set their own terms). |
| Acting on a result | Nothing: the downloads are aggregate statistics with no listings or contacts. | Not stated on its pages |
| Limits on keeping or showing results | Redfin's terms forbid automated crawling or querying of the site and copying or redistributing MLS listing information. | No storing MLS content except temporary caching for performance, unless your key permits replication; MLS display rules and license terms apply. |
| AI in its terms | No AI rule; the only AI mention is an MLS (BAREIS) disclaimer that listing material may have been generated by AI. | Not stated on its pages |
| Coverage | US | Participating MLSs on the FBS platform; no list or count on its pages. |
| MCP server | – | No official server listed |
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 Spark API?
A free developer account, then an MLS data plan or an MLS member who authorizes your app.
Is Spark API free?
Developer account sign-up is free.
Sources
Every line about another company comes from its own pages. Prices and terms change, so check the source before you rely on one.
Redfin Data Center, read on October 15, 2026:
- redfin.com/news/data-center: “Downloadable housing market insights from across the U.S.”
- redfin.com/news/data-center/downloads: “Each row represents one region for one time period.”
- redfin.com/about/terms-of-use: “automatedly crawl or query the Services for any purpose or by any means”
- redfin.com/about/terms-of-use: “You will not copy, redistribute, or retransmit any of the information provided”
- redfin.com/about/terms-of-use: “may include such material that has been generated by use of artificial intelligence”
Spark API, read on October 15, 2026:
- sparkplatform.com/docs/overview/api: “The Spark API allows authorized MLS members to request data through developer applications”
- sparkplatform.com/docs/overview/api: “When IDX applications are purchased, the MLS member must authorize that application to access their data.”
- sparkplatform.com/docs/overview/faq: “It’s free to sign up for a Spark API developer account.”
- sparkplatform.com/docs/overview/faq: “Once you have access to data from your first MLS, API access costs $50/mo for each MLS you can access.”
- sparkplatform.com/docs/terms_of_use/developer_agreement_and_terms_of_use: “except for temporary caching purposes necessary for performance enhancement”
- sparkplatform.com/docs/terms_of_use/developer_agreement_and_terms_of_use: “Compliance with MLS Rules and License Terms regarding MLS Content”