Intercom's Fin, Ada, Forethought, Gupshup, Five9 and Amazon are racing to build support agents that resolve tickets on their own. As the platforms buy up the startups, here is who does what - and where the real money is going.

A pack of well-funded startups - Decagon, Ada, Uniphore, Omilia - plus Amazon, Kore.ai, Capacity and Five9 are teaching software to resolve support tickets end to end. The prize is a customer service market worth hundreds of billions, and the humans who used to answer the phone.