{"id":1511,"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","status":"current","audiences":["kevin","candid-team"],"topics":["real-estate-mls","reso-data-dictionary","mls-data-licensing"],"reference_body":"**Claim.** The RESO Web API is the modern industry standard: REST/JSON on OData v4, OAuth-based, calls the MLS directly with no local duplication. NAR requires REALTOR-association-owned MLSs to provide production-level Web API access. Data is gained through local MLSs after agreeing to their data-use and licensing policies.\n\n**Quote.**\n> \"Access to data from the Web API is gained through local MLSs. After agreeing to an MLS's data use and licensing policies, data recipients work directly with that MLS's software provider…\"\n\n**Source.** reso.org/reso-web-api, accessed 2026-06-21.\n\n**Confidence.** Verified.\n\n**Caveats.** \"Production-level Web API access\" is the NAR mandate; individual MLSs vary in how complete or current their implementation is, and licensing tiers (IDX/VOW/back-office) control which fields are actually exposed even on a compliant API.\n\n**Implication / use.** The modern feed mechanic. Any \"we built on RETS\" claim is legacy; any \"we built on RESO Web API\" claim still depends on the per-MLS DLA scope.","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"}],"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":"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","link_type":"relates-to"}]},"created_at":"2026-06-21T10:45:32.906Z","updated_at":"2026-06-21T10:45:32.906Z"}