This paper outlines the experience developing Addiction Medicine Practice-Based Research Network (AMNet), which promotes the adoption of patient-reported outcome measures (PROMs) and measurement-based care in outpatient addiction treatment practices and creates a platform for quality improvement and research. From August 2019 to July 2023, the AMNet team selected patient-reported outcome measures for implementation in the American Psychiatric Association's clinical data registry (PsychPRO), recruited addiction medicine providers, and collected PROMs data. AMNet selected 12 PROMs for implementation in PsychPRO. Through July 2023, 1565 providers expressed interest, of whom 216 of the 929 eligible providers (23%) attended an onboarding call/webinar. Two hundred six providers (95%) from 54 practices returned Participation Agreements. Subsequently, 65 providers (32%) from 39 practices withdrew, resulting in 141 (68%) providers from 15 practices. From November 2020 to July 2023, 38 providers submitted PROMs data using 1 of 3 PsychPRO patient portals. Sixteen of the 53 providers (30%) who signed up for the initial portal collected data from 468 patients. As of July 2023, 83 of the 141 providers (59%) opted to submit PROMs data from their own portal or electronic health record. Next steps will include continued recruitment of providers, addressing barriers to data transfer and integrating data from providers' portals into the registry to create a platform for future research.