Seems like people are missing the point of the question. Saying $1 is too expensive for 1000 calls without knowing what that API call does shows you're thinking

Seems like people are missing the point of the question. Saying $1 is too expensive for 1000 calls without knowing what that API call does shows you're thinking in terms of value, not in terms of a pricing model that is favorable. The OP hasn't told us if he's doing ML calculations, spinning up machines, painting a Tesla, selling an airplane ticket or what. Think in terms of the pricing model only. Yes it would be nice to know what the service does, but the OP probably can't give that away.