While official Apple Watch sales numbers have not been released, smart businesses are quickly tweaking their iOS apps to work with Apple's wearable and while native Apple Watch apps are a few months away (watchOS was just released this week), there are benefits to enabling Watch interaction for popular existing apps.
eBay's app update offers quick access to activity, items you're watching as well as up to the minute status of things you're buying or selling. You can't use the Watch to search for items, place a bid or contact sellers since the interface and screen size isn't optimized for this but being able to get an update of your current status at a glance on the Watch may prove convenient to serious eBay users. Check it out here.