A Virtual Office Website is the National Association of REALTORS policy framework permitting a broker to provide MLS listing data to consumers who have registered and established a broker-consumer relationship. VOW access typically carries more data than IDX — including some sold and historical information — in exchange for authentication, a broker relationship, and stricter terms of use. Like IDX, it is a private agreement rather than a statute.
VOW
Industry policy — not law United States (trade association / local MLS)
A binding rule made and enforced by a private trade association through membership and licensing, not by a legislature or regulator.
VOW is the authenticated tier of American listing access, and it emerged from a genuine antitrust fight about whether brokers operating primarily online could obtain the same data as brokers with offices.
Where IDX governs public display, VOW governs what a broker may show a consumer who has registered and established a broker-consumer relationship. The trade is more data — often including sold and historical records that IDX withholds — for authentication and tighter terms.
- Consent-gated by design - The consumer must register and agree to terms. In principle this is the closest thing US real estate has to a consent primitive.
- Richer than IDX - The data differential is the reason VOW exists and the reason it was contested.
- Still per-MLS - Like IDX, terms are set locally. There is no national VOW contract.
The irony worth recording is measured. VOW is a consent-and-identity framework built into the access layer —
and The State of US Real Estate APIs found zero of forty-five organizations publish a machine-readable
consent_identity primitive, and zero publish idempotency. The sector has an elaborate consent regime
expressed entirely in contracts between institutions, and none of it expressed in a form software can read.
The consent exists; it just lives in a PDF.
Together with IDX and NAR Policy Statement 7.90, VOW completes the American picture: a mandated schema, a certified conformance programme, and two private licensing tiers that determine whether any of it is reachable. The standard is public. The data is not. And an agent, which can satisfy a schema but cannot enter a broker-consumer relationship, is locked out by the tier that was designed to protect consumers.
Referenced in API Evangelist papers
This regulation shows up in my published research. These reports read the machine-readable evidence provider by provider — and put this regulation in the context of a real sector.
The State of US Real Estate APIs
The authenticated-consumer counterpart to IDX, carrying richer data behind a registration and broker-relationship requirement — a second private access tier a machine cannot enter.
