Leprechaun gold

Leprechaun Goold
Leprechauns have the ability to produce gold coins that look and feel authentic as regular coins, certainly in the wisarding community. It has the quality of disappopearing after a few hours. Although the coins seem identical to ordinary ones, goblin experts can differentiate them from ordinary coins, as Harry Potter, Hermione Granger, and Ron Weasley overheard when they visited Gringotts Wizarding Bank in search of one of Lord Voldemort's Horcruxes.

Ludo Bagman paid off bets to Fred and George Weasley at the Quidditch World Cup using Leprechaun gold.