You can spend South African rand

Currency in Eswatini is one of the Things About Eswatini You Should Know. Namibia, Lesotho, and Eswatini, all members of the Common Monetary Area, accept the South African rand as legal money. Although each of these countries has its own national currency (the dollar, loti, and lilangeni, respectively), they have all been tied to the rand since their inception, and the rand is still commonly recognized as a substitute. In Botswana, the rand was legal money until 1976, when the pula replaced it at par.

The lilangeni (plural: emalangeni) is the currency of eSwatini, and it has the same exchange rate as the South African rand. You can also spend South African rand (excluding coins) anywhere in the country because rand notes are widely accepted. Remember to change your emalangeni back before you leave because exchanging this currency outside of eSwatini is difficult. Many businesses, restaurants, and hotels accept credit cards, and most ATMs will let you withdraw money using an international debit card.