Brendan Ryan works on protocol engineering at Tempo and is the co-author of the Machine Payments Protocol (MPP), the open standard Tempo and Stripe built for how agents make payments. He also co-authored the IETF internet draft that turns HTTP 402 Payment Required into a working payment flow, the specification MPP is built on, and works with the agent developers, model providers, and commerce platforms building against it. Before Tempo, he was an engineering manager on Issuing at Stripe and an engineer at Bridge.