Three is a marketplace and runtime for 3D AI agents — autonomous characters that users can discover, deploy, and pay to interact with. Each agent lives in a fully rendered 3D environment powered by Three js and can be monetized by its creator through time passes, trials, and per-session payments using USDC and the x402 payment protocol. Creators can list agents on the marketplace, set pricing, and earn directly. Users browse the catalog, launch agents in-browser, and pay with their connected wallet, with no intermediary. The platform also includes a built-in wallet dashboard for balances, receipts, and withdrawals. Three is infrastructure for the agent economy: own, run, and earn from AI agents with real onchain payments.