Enrique asked a quite simple question on the Cardano Developers Telegram channel: Can we make a Cardano smart contract in dollars?
Well, technically we can’t, at least directly. Cardano runs on Ada, not dollars. And doesn’t include paying by bank or credit cards. Further exploration on his question actually delivered something more feasible: Can we make a Cardano smart contract to pay $10 in ADA for some product or service?
http://www.javiercasas.com/articles/plutus-smart-contracts-pay-usd10-in-ada