How much is it costing you? Charge a markup on that you're happy with rather than picking a number out of thin air? Also set a healthy free limit, if people ar

How much is it costing you? Charge a markup on that you're happy with rather than picking a number out of thin air? Also set a healthy free limit, if people are already paying for one product, they're not going to want to pay for an API separately if they just want to make a few calls.