I am developing RosterHelm, a consumer mobile app that helps fantasy-sports users manage their own rosters. The planned Yahoo integration would use OAuth to access a user's Yahoo Fantasy leagues, teams, players, and roster data, and may support user-directed roster actions. RosterHelm may be distributed as a commercial app, including paid or subscription features.

The Yahoo Fantasy Sports API Terms say the APIs may not be used in connection with commercial activity, and the general Yahoo API Terms refer to prior, express, written permission for income-generating uses. Please confirm in writing whether this planned use is permitted. If separate commercial approval, an agreement, application registration, review, fees, rate limits, or other conditions are required, please provide the correct process and contact. If this public forum is not the proper place for a legal determination, please route me to the Yahoo team authorized to provide one or give me a private contact channel.