This document summarizes the University of Toronto Libraries' efforts to track article processing charges (APCs) paid by UofT-affiliated authors publishing in open access journals. The goal was to determine the volume of open access research published and calculate the total APC costs. Data on publications was extracted from sources like DOAJ, Scopus and Web of Science to identify UofT authors. APC costs were estimated using a formula from a previous report. Testing found variations in reported APC payments. Future work could re-evaluate average APC costs, target specific fields of study, and account for authors publishing in subscription journals paying higher APCs.