In an age where we can send mail electronically in seconds at no cost rather than going to the post, it seems odd that people still walk around with pieces of metal and paper in their pockets to pay for things. Yet cash has remained the undisputed king of payments for consumers and small businesses in sub-Saharan Africa (SSA). The World Bank Global Findex survey for 2017 showed that only a third of SSA adults reported having made or received any digital payment in the past year. Among the reasons provided is that cash is seen as trustworthy, convenient and cheap. And for those wishing to remain informal, it has the added benefit of not being traceable.