Zillow Co-Founder’s AnyProp Opens Nationwide MLS Data API After Two Years in Stealth

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A new real estate data company co-founded by Zillow co-founder Spencer Rascoff is opening its MLS infrastructure nationwide, taking aim at one of the less visible but costly problems facing brokerages and proptech companies: connecting to hundreds of local listing databases while staying inside each organization’s rules.

AnyProp said it is opening its MLS Data API to qualifying real estate brokerages and software vendors serving MLS participants after spending two years in development and testing. Rascoff co-founded the company in 2024 with Lawrence Zhou and Lee Lin, co-founders of the search portals RentHop and RealtyHop, through 75 & Sunny Labs.

The Sept. 17 launch did not surface broadly in the real estate trade press until this week, making it a catch-up story for WRE rather than a Sept. 21 company announcement.

The problem AnyProp is trying to solve

There is no single national MLS database that a brokerage can simply plug into. AnyProp says firms operating across multiple markets can face different licensing procedures, data schemas, display requirements, reporting obligations and vendor rules across roughly 500 MLS organizations.

The company’s product normalizes listing information into a common API and supports Internet Data Exchange, Virtual Office Website and broker back-office uses. Its website says the platform can provide data through APIs, webhooks, feeds and bulk exports while coordinating MLS approvals and compliance requirements.

AnyProp says it is an approved IDX, VOW and BBO feed vendor with every major MLS in the country and hosts listing data and photos across a broad MLS network. Those coverage and approval claims come from the company and should not be read as an independent certification by the MLS industry as a whole.

The platform is aimed at brokerages and technology vendors that would otherwise need engineering and compliance resources to maintain numerous feeds. The company says customers can begin with a small number of markets, expand over time and remove markets with 90 days’ notice.

MLS infrastructure is becoming a strategic battleground

The launch arrives while listing distribution is under unusual scrutiny. Brokerages, MLSs and national portals are fighting over pre-market inventory, private-listing strategies, display rules and where consumers first encounter homes for sale.

That makes the infrastructure underneath listings more consequential. A brokerage that wants to launch in a new market does not only need agents and marketing; it also needs reliable access to local property data and systems that comply with the rules governing that data.

AnyProp is effectively betting that brokerages would rather outsource much of that plumbing than build and maintain it internally.

The company has not disclosed revenue, customer count or outside funding in its launch materials. It said its beta customers included both early-stage brokerages and established national companies, including Pacaso, another company co-founded by Rascoff.

Why it matters

For agents, the API itself will largely remain invisible. For brokerage operators and real estate software companies, however, the ability to enter markets without rebuilding MLS integrations can affect launch time, technology cost and compliance risk.

The more important test will come after launch: how broad AnyProp’s usable coverage proves to be in practice, how quickly it can keep pace with rule changes across MLS organizations, and whether brokerages decide a third-party national layer is preferable to maintaining direct integrations themselves.

That is a technical fight, but it sits directly underneath the consumer real estate experience. Whoever makes listing data easier to deploy can influence how quickly new search products, brokerage models and housing marketplaces reach buyers and sellers.