Word Network: 有料

Ryōkin refers to a fee, charge, or fare paid in exchange for a specific service or the use of a facility. It is commonly used for things like utility bills, transportation fares, and admission fees.

Free (of charge).

Daikin refers to the specific amount of money paid or to be paid in exchange for goods or items purchased. It is most commonly used in retail and commercial contexts when referring to the payment for a physical product.