Agiotage

[Sarah]

Exchange business; also, stockjobbing; the maneuvers ofspeculators to raise or lower the price of stocks or public funds.Vanity and agiotage are to a Parisian the oxygen and hydrogen oflife. Landor.

[Sommer]

the buying and selling of different currencies in order to make a profit from different exchange rates in different places:

[Dave Paprocki]

The business of money-changing.