Buyers keep finding the same house at three different prices across three different listing sites, and the explanation isn’t fraud, it’s a 12-hour rule most shoppers have never heard of. Under the National Association of Realtors’ Internet Data Exchange policy, brokers and the third-party sites that display their listings only have to refresh that data “at least once every 12 hours,” according to NAR’s official IDX Policy, Statement 7.58. In a market where price cuts happen daily, that half-day gap is enough for a house to show three prices at once depending on which tab a buyer has open.
Key Points
- The local Multiple Listing Service is the authoritative source; every other site is a downstream copy running on its own refresh schedule.
- NAR policy sets a 12-hour maximum refresh window for IDX feeds, not a minimum, so sync speed varies site to site.
- More than three in five U.S. home listings were sitting “stale” on the market as of mid-2024, according to Redfin’s research team, meaning price and status changes are happening on listings buyers may already be tracking.
- The Real Estate Standards Organization, the nonprofit that sets national data standards for the industry, has spent years pushing MLSs toward faster “replication” feeds precisely because lag time creates buyer confusion.
The mechanics are straightforward once you see them. A seller’s agent enters a price cut into the local MLS. That change is supposed to be the single source of truth. But the buyer’s favorite search site, a real estate app, and a broker’s own website each pull that MLS data through separate feeds, and NAR’s rule only requires those feeds sync twice a day at minimum. A site that syncs every 15 minutes and one that waits the full 12 hours can legally show different numbers on the same listing at the same moment.
Status mismatches compound the problem. A property can read “active” on one site while it’s already under contract on another, simply because the second feed hasn’t caught up, a gap the NAR-adopted IDX rules exist to limit, not eliminate. Buyers who don’t know to check the listing’s original MLS number, rather than trust whichever app they downloaded, end up chasing homes that are effectively gone or negotiating off a number the seller already changed.
No single company is misrepresenting anything when this happens; every site is technically compliant with the refresh window it’s operating under. That’s part of why the confusion persists: there’s no violation to report, just a structural lag baked into how listing data legally moves from the MLS outward. Real estate agents can usually resolve a price discrepancy in minutes by pulling the listing’s current MLS sheet, which is the one document not subject to a syndication delay.
The practical fix for buyers is unglamorous: treat any third-party site as a lead generator, not a price source, and confirm the live number and status with the listing agent or the MLS record before writing an offer. Until IDX feed speeds catch up with how fast sellers are cutting prices in a slower market, the gap between what a site shows and what a house actually costs will keep showing up as three numbers instead of one.
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