Decagon builds AI agents that fully handle customer service conversations for large enterprises — no humans required. Founded in 2023 in San Francisco, the platform lets brands deploy agents that can authenticate users, look up orders, process returns, and resolve issues across voice, chat, email, and SMS in a single interaction. Instead of coding rigid decision trees, companies write instructions in plain English using Decagon's "Agent Operating Procedures" (AOPs), which the platform converts into executable logic. The product emphasizes sub-400ms response latency to keep conversations feeling natural. Customers include Avis Budget Group, Block (Cash App/Square), Chime, Oura Health, Notion, Duolingo, Mercado Libre, and Deutsche Telekom. Revenue is charged per conversation or per successful resolution. The product is enterprise-only and 100% sales-led — no self-serve signup.