There are many answers that can have different approaches. However i would say that we are not the only animal to pay. Bees, ants, etc need to work to sustain their queen, they pay with their work to be part of a group. Apes, lions and many other bigger animals also “pay” their respect to a hierarchy. If not, they are either pushed out of the group or even killed. In mating, many others as birds will need to provide gifts so that the other sex allows to mate.
So they are paying. Not with money as you might be referring to in the question, but there is some kind of transaction.