The only services with my payment information are Heroku and Amazon. On Heroku, the first dyno is completely free and it doesn't increase the number of dynos automatically. But when you have heavy traffic, you can easily scale the number of dynos.
Amazon does charge automatically and doesn't have a limit on the maximum amount I want to spend, so there is a risk there. But then, its not too expensive even if I get a lot of traffic.
Amazon does charge automatically and doesn't have a limit on the maximum amount I want to spend, so there is a risk there. But then, its not too expensive even if I get a lot of traffic.