Banknotes exchanges.
You send 5 banknotes
to a random member
and you receive 5 back!
papermoney.club connects banknote collectors who want to exchange physical notes by mail. Members send a lot of five different banknotes in good condition to a randomly assigned collector, with an exchange ID in the envelope. Once the recipient registers the lot, the sender can receive five banknotes from another member. The format helps collectors discover paper money from different countries and collections.