Definition
Internet Data Exchange - system allowing real estate websites to display MLS data with permission from local boards.
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IDX feeds allow websites (Zillow, Realtor.com, agent websites) to display MLS listings. IDX requires compliance with local board rules. IDX data is fresher than aggregated data, typically updating hourly. IDX is how consumers access most real estate information.
Pro Tip
MLS and IDX data are the most up-to-date; using these sources ensures you see latest listings before competitors.
Example
A real estate agent's website displays MLS listings updated hourly through IDX connection to local board