One idea might be to charge per usage rather than on a monthly basis. So let's say I'm starting a project I pay a one-time fee to use the application for a cert

One idea might be to charge per usage rather than on a monthly basis. So let's say I'm starting a project I pay a one-time fee to use the application for a certain amount of queries, days or weeks. Like skyhook_mockups said it's not something I'd use everyday but rather a couple of times a year when I start a new project or pivot.