In Need of a Team with Connections
Both Leaf and Signables have strong connections to the largest athlete management agencies in the world. However, when working with those agencies, they were limited to the athletes on their roster. With OpenSponsorship, both companies are able to reach nearly any athlete in the world due to OpenSponsorship's connection with managed athletes, self-managed athletes, and athletes that are represented by small agencies.
You can try to navigate the complicated athlete/agency world, or an OpenSponsorship account manager can do it all for you.