Certification - DD 2.1 - RESO Data Dictionary

Certification Model

RESO replaced the previous metallic-tier certification system with a Core + Endorsements model. Core certification aligns with the RESO Web API specification and ensures baseline compliance.

Endorsements

IDX Payload

Fields required for Internet Data Exchange

BBO Payload

Fields required for Broker Back Office operations

JSON DD

Data Dictionary metadata served via JSON

Process

Certifications expire after two Data Dictionary versions
Testing is conducted using RESO certification tools
Contact dev@reso.org for certification inquiries

Terms and DefinitionsGenerated April 22, 2026