Real Estate Transaction Standard (RETS)
RETS, the Real Estate Transaction Standard, is the XML-based protocol that carried multiple listing service data between systems for roughly two decades before the RESO Web API replaced it. Version 1.8 is the last widely-deployed revision. RESO formally retired it in favour of an OData-based successor, and it remains in production at major data distributors years afterward.
Also known as Real Estate Transaction Standard, RETS 1.8.
Providers that carry RETS 4
These providers' own APIs.json profiles carry RETS as a tag — the provider's statement that the standard is part of what it does. APIs.io has not verified the implementation on this page; the de facto profiles on this site are where that measurement exists. Ordered by Kin Score.
Read from the API Evangelist standards directory, facts verified 2026-08-17. Provider links come from the catalog's own identity tags and are rebuilt nightly. If this page is wrong about a standard or a provider, say so.