PAPER single-dose capsule for coffee. It is a capsule with a paper filter already fitted onto the bottom. Capsule with a bottom having two rings of differing heights, which makes it possible to optimally exploit the coffee brewing process. This configuration also enables a precharging action toward the upper area, so as to maintain homogeneity during the brewing phase by limiting the "fast tracks" of water in the coffee. The same capsule can be made of biodegradable BIODè material, maintaining unlatered the food and physical characteristics of the product (for further information see the website www.biode.it).