Voice Agent API

AssemblyAI is building the voice layer for the AI economy—literally. Founded in 2017 and Y Combinator-backed, they offer a Voice Agent API that lets developers stream audio in and get audio back. That's it. That's the product. And it's built on what they claim is the most accurate Voice AI in the market. They're targeting AI notetakers, medical scribes, call analytics tools, voice agents—any app that needs to listen and talk back.

Real-time and async streaming support means you can build anything from a notetaker that transcribes your Zoom call to a full-on conversational agent that actually sounds human. Their pricing is refreshingly simple: $4.50 per hour flat. No per-minute math, no confusing tier structures, no gotchas. You're just paying for compute.

The team includes Luka Chkhetiani, Dylan Fox, Ryan Eloff, Dan Ince, Britney Xiu, Meredith Rauch, Nick Morris, and JD Prater. That's nine people and they're handling some of the hardest problems in speech AI—accuracy, latency, and building APIs that developers actually want to use. They have a GitHub with open-source SDKs, which is more than most语音 API startups can say.