The Yahoo + Stamps.com Partnership
Yahoo and Stamps.com have an active Technology Partnership according to www.stamps.com. There are 136 companies in the Yahoo partner ecosystem and 68 companies in the Stamps.com partner ecosystem.
5 companies exist in both ecosystems, representing 4% of the Yahoo parther ecosystem and 7% of the Stamps.com partner ecosystem. PayPal and ShipStation are the largest companies that exist in both ecosystems.