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.
