Single-dose capsule comprising a sealed moulded-plastic casing (10) having an end wall (16) provided with orifices (24) and a bottom sealing foil (17). A chamber (30) is formed between the said foil (17) and the bottom surface (18) of the perforated end wall (16) and is filled with the beverage percolated through the said orifices (24) before it is discharged directly towards an underlying container through the spout created at the moment of opening or tearing of the said bottom foil (17), immediately before the start of percolation. USE: preparation of a percolated of the beverage. ADVANTAGES: high quality of the beverage.