Since Automatio is bootstrapped project and in alpha phase, we are looking to work with customers who really find it useful and who can afford yearly package. It might be pricey for independent makers or small businesses, but in around ~2 months we will launch fully publicly so anyone can subscribe on monthly basis.

Could there be a (slightly more expensive) purely usage based pricing?

It would be amazing for little tinker projects to just pull some values from the web here and there.

Actually is based on the usage. And in next 2 months we gonna release normal monthly packages. Every user will get certain amount of credits which are reduced for each second Automatio run. It mean that Automatio is charging per second of what is used, but on monthly subscription basis.

So there is a minimum price? Or could i use and pay for a single credit a month if I want to get e.g. the monthly average temperature of my city.

Currently only yearly package for EA program. But soon we get out of it, will have flexible packages, something you described.