{"id":1502,"slug":"reso-rets-deprecated-june-2018-dd-2-0-ratification-timeline","title":"RESO RETS deprecated June 2018; DD 2.0 ratified Oct 23 2023, effective April 15 2024; NAR-affiliated MLS one-year certification (industry-reported ~April 2025)","kind":"reference","scope":"business","status":"current","audiences":["kevin","candid-team"],"topics":["reso-data-dictionary","mls-data-licensing"],"reference_body":"**Claim.** RESO deprecated/stopped supporting RETS in June 2018. DD 2.0 was ratified October 23, 2023 with an effective ratification date of April 15, 2024 for certification testing. Industry sources (WAV Group; repeated by Constellation/MEV) report NAR-affiliated MLSs had to certify on DD 2.0 within one year (~April 2025).\n\n**Source.** reso.org; reso.org/product-updates; WAV Group via mlsimport.com vendor blog, accessed 2026-06-21.\n\n**Confidence.** Verified for the RETS deprecation date and DD 2.0 ratification dates (RESO primary). Industry-reported / single-source for the NAR one-year mandate — the WAV Group framing is not confirmed on a RESO or NAR primary page.\n\n**Caveats.** The NAR one-year mandate is the only piece without a primary source in the trail; treat as industry-reported, not RESO-primary-confirmed.\n\n**Implication / use.** Standards timeline anchor. The 2018 RETS sunset matters for any \"we built this on RETS\" legacy claim; the 2024 DD 2.0 effective date matters for any \"we conform to DD 2.0\" data-product claim.","rationale_body":null,"metadata":null,"links":{"outgoing":[{"slug":"research-brief-mls-data-inside-the-box-ontario-june-2026","title":"Research notes (capture-layer): inside the MLS box — what an Ontario member agent's account exposes, what goes unused, and what they're licensed to do with it (June 2026)","kind":"research-notes","scope":"business","link_type":"depends-on"},{"slug":"reso-web-api-odata-v4-oauth-direct-replaces-rets","title":"RESO Web API — REST/JSON on OData v4, OAuth, calls MLS directly (no local DB duplication); NAR requires REALTOR-association MLSs to provide production-level Web API access","kind":"reference","scope":"business","link_type":"relates-to"}],"incoming":[{"slug":"research-brief-mls-data-inside-the-box-ontario-june-2026","title":"Research notes (capture-layer): inside the MLS box — what an Ontario member agent's account exposes, what goes unused, and what they're licensed to do with it (June 2026)","kind":"research-notes","scope":"business","link_type":"relates-to"},{"slug":"caveats-mls-data-inside-the-box-untested-clauses-and-self-reported-metrics","title":"Caveats: MLS-data inside-the-box brief (June 2026) — untested clauses, self-reported metrics, contested copyright status","kind":"reference","scope":"business","link_type":"relates-to"}]},"created_at":"2026-06-21T10:45:32.851Z","updated_at":"2026-06-21T10:45:32.851Z"}