From Dragon Ball Encyclopedia, the ''Dragon Ball'' wiki
The Zeni (ゼニー, Zenii; FUNimation "Zenie") (Ƶ), Zenni, or Zenny, is the name of a currency.
 Dragon Ball
The winner of the Tenkaichi Tournament received 500,000 Zeni.
 Video games
Zeni was featured in many Dragon Ball Z video games, such as the Budokai video game series and the Budokai Tenkaichi video game series. Zeni could be found in the Story mode of the video games and by winning a tournament in the World Tournament mode. Zeni was used in order to buy techniques, items, etc. in the video game's shop. Alternatively, Zeni could also be earned by finishing runner-up in a tournament after losing in the finals in the World Tournament mode.